try fix similaruuty and add seed for master excel icd

.env.example

@@ -176,4 +176,6 @@ METRICS_PATH=/metrics
 HEALTH_CHECK_PATH=/health
 
 OPENAI_API_KEY=xxxxxx
-OPENAI_API_MODEL=text-embedding-ada-002
+OPENAI_API_MODEL=text-embedding-ada-002
+
+VECTOR_SIMILARITY_THRESHOLD=0.85

docker-compose.yml

@@ -1,7 +1,8 @@
+version: '3.8'
+
 services:
-  # PostgreSQL Database with pgvector extension
   postgres:
-    image: pgvector/pgvector:pg15
+    image: pgvector/pgvector:pg17
     container_name: claim-guard-postgres
     restart: unless-stopped
     environment:
@@ -9,7 +10,7 @@ services:
       POSTGRES_USER: postgres
       POSTGRES_PASSWORD: postgres123
     ports:
-      - '5432:5432'
+      - '5433:5432' # host:container → akses dari host pakai port 5433
     volumes:
       - postgres_data:/var/lib/postgresql/data
       - ./docker/postgres/init:/docker-entrypoint-initdb.d

docs/ENVIRONMENT_VARIABLES.md

@@ -0,0 +1,73 @@
+# Environment Variables
+
+## Database Configuration
+- `DATABASE_URL`: PostgreSQL connection string
+  - Example: `postgresql://username:password@localhost:5432/claim_guard_db`
+
+## OpenAI Configuration
+- `OPENAI_API_KEY`: Your OpenAI API key for embeddings
+- `OPENAI_API_MODEL`: OpenAI model for embeddings (default: `text-embedding-ada-002`)
+
+## Vector Search Configuration
+- `VECTOR_SIMILARITY_THRESHOLD`: Minimum similarity threshold for vector search (default: `0.85`)
+  - Range: 0.0 to 1.0
+  - Higher values = more strict matching
+  - Recommended: 0.85 for production, 0.7 for development
+
+## Application Configuration
+- `PORT`: Application port (default: 3000)
+- `NODE_ENV`: Environment mode (development/production)
+
+## Example .env file
+```bash
+# Database
+DATABASE_URL="postgresql://username:password@localhost:5432/claim_guard_db"
+
+# OpenAI
+OPENAI_API_KEY="your-openai-api-key-here"
+OPENAI_API_MODEL="text-embedding-ada-002"
+
+# Vector Search
+VECTOR_SIMILARITY_THRESHOLD=0.85
+
+# App
+PORT=3000
+NODE_ENV=development
+```
+
+## Similarity Threshold Guidelines
+
+### Production Environment
+- **High Precision**: 0.90 - 0.95 (very strict matching)
+- **Standard**: 0.85 - 0.90 (recommended for most use cases)
+- **Balanced**: 0.80 - 0.85 (good balance between precision and recall)
+
+### Development Environment
+- **Testing**: 0.70 - 0.80 (more lenient for testing)
+- **Debugging**: 0.60 - 0.70 (very lenient for development)
+
+### How to Set Threshold
+
+#### Via Environment Variable
+```bash
+export VECTOR_SIMILARITY_THRESHOLD=0.90
+```
+
+#### Via .env file
+```bash
+VECTOR_SIMILARITY_THRESHOLD=0.90
+```
+
+#### Via API (Runtime)
+```bash
+POST /api/pgvector/threshold
+{
+  "threshold": 0.90
+}
+```
+
+## Impact of Threshold Changes
+
+- **Higher Threshold (0.90+)**: Fewer results, higher precision, more relevant matches
+- **Lower Threshold (0.70-)**: More results, lower precision, may include less relevant matches
+- **Optimal Range (0.80-0.90)**: Good balance between precision and recall for most medical coding use cases

docs/SIMILARITY_THRESHOLD.md

@@ -0,0 +1,243 @@
+# Similarity Threshold Configuration
+
+## Overview
+
+The similarity threshold feature allows you to control the precision of vector search results by setting a minimum similarity score required for results to be returned. This ensures that only highly relevant matches are included in search results.
+
+## Default Configuration
+
+- **Default Threshold**: `0.85` (85% similarity)
+- **Environment Variable**: `VECTOR_SIMILARITY_THRESHOLD`
+- **Range**: 0.0 to 1.0 (0% to 100% similarity)
+
+## API Endpoints
+
+### 1. Get Current Threshold
+
+```http
+GET /api/pgvector/threshold
+```
+
+**Response:**
+
+```json
+{
+  "threshold": 0.85,
+  "description": "Minimum similarity score required for search results (0.0 - 1.0)"
+}
+```
+
+### 2. Set Threshold
+
+```http
+POST /api/pgvector/threshold
+Content-Type: application/json
+
+{
+  "threshold": 0.90
+}
+```
+
+**Response:**
+
+```json
+{
+  "message": "Similarity threshold updated successfully",
+  "threshold": 0.9,
+  "previousThreshold": 0.85
+}
+```
+
+### 3. Advanced Vector Search
+
+```http
+POST /api/pgvector/advanced-search
+Content-Type: application/json
+
+{
+  "query": "diabetes mellitus type 2",
+  "limit": 10,
+  "category": "ICD10",
+  "threshold": 0.90
+}
+```
+
+## Search Methods
+
+### Standard Vector Search
+
+- Uses cosine similarity
+- Default threshold from environment variable
+- Good for general use cases
+
+### Advanced Vector Search
+
+- Combines cosine and euclidean similarity metrics
+- Weighted scoring: 70% cosine + 30% euclidean
+- Higher precision results
+- Recommended for production use
+
+### Hybrid Search
+
+- Combines vector similarity with text search
+- Uses threshold from environment variable
+- Best balance of semantic and text matching
+
+## Threshold Recommendations
+
+### Medical Coding Use Cases
+
+| Use Case                     | Recommended Threshold | Description                                   |
+| ---------------------------- | --------------------- | --------------------------------------------- |
+| **High Precision Diagnosis** | 0.90 - 0.95           | Very strict matching for critical diagnoses   |
+| **Standard Medical Coding**  | 0.85 - 0.90           | Recommended for most medical coding scenarios |
+| **General Medical Search**   | 0.80 - 0.85           | Good balance between precision and recall     |
+| **Research & Exploration**   | 0.70 - 0.80           | More lenient for research purposes            |
+
+### Environment-Specific Settings
+
+#### Production Environment
+
+```bash
+VECTOR_SIMILARITY_THRESHOLD=0.85
+```
+
+#### Development Environment
+
+```bash
+VECTOR_SIMILARITY_THRESHOLD=0.70
+```
+
+#### Testing Environment
+
+```bash
+VECTOR_SIMILARITY_THRESHOLD=0.75
+```
+
+## Implementation Details
+
+### Environment Variable
+
+```bash
+# Set in .env file
+VECTOR_SIMILARITY_THRESHOLD=0.85
+
+# Or set as system environment variable
+export VECTOR_SIMILARITY_THRESHOLD=0.85
+```
+
+### Runtime Configuration
+
+```typescript
+// Get current threshold
+const currentThreshold = pgVectorService.getSimilarityThreshold();
+
+// Set new threshold
+pgVectorService.setSimilarityThreshold(0.9);
+```
+
+### SQL Query Optimization
+
+The system automatically optimizes SQL queries to:
+
+- Filter results at database level using threshold
+- Order results by similarity score
+- Use appropriate vector similarity operators
+
+## Performance Impact
+
+### Higher Threshold (0.90+)
+
+- ✅ Fewer results to process
+- ✅ Higher precision
+- ❌ May miss relevant results
+- ❌ Slower query execution (more filtering)
+
+### Lower Threshold (0.70-)
+
+- ✅ Faster query execution
+- ✅ More comprehensive results
+- ❌ Lower precision
+- ❌ More irrelevant results
+
+### Optimal Range (0.80-0.90)
+
+- ✅ Good balance of precision and performance
+- ✅ Suitable for most medical coding scenarios
+- ✅ Reasonable query execution time
+
+## Troubleshooting
+
+### Common Issues
+
+1. **No Results Returned**
+   - Check if threshold is too high
+   - Verify embeddings are generated
+   - Check database connection
+
+2. **Too Many Results**
+   - Increase threshold value
+   - Use advanced search method
+   - Add category filters
+
+3. **Performance Issues**
+   - Optimize threshold for your use case
+   - Use database indexes
+   - Consider batch processing
+
+### Debug Commands
+
+```bash
+# Check current threshold
+curl -X GET http://localhost:3000/api/pgvector/threshold
+
+# Get embedding statistics
+curl -X GET http://localhost:3000/api/pgvector/stats
+
+# Test with different thresholds
+curl -X POST http://localhost:3000/api/pgvector/advanced-search \
+  -H "Content-Type: application/json" \
+  -d '{"query": "test", "threshold": 0.80}'
+```
+
+## Best Practices
+
+1. **Start with Default**: Begin with threshold 0.85
+2. **Test Incrementally**: Adjust threshold in small increments (0.05)
+3. **Monitor Results**: Evaluate precision vs. recall trade-offs
+4. **Environment Specific**: Use different thresholds for different environments
+5. **Document Changes**: Keep track of threshold changes and their impact
+
+## Migration Guide
+
+### From Previous Version
+
+If upgrading from a version without configurable threshold:
+
+1. **Set Environment Variable**:
+
+   ```bash
+   VECTOR_SIMILARITY_THRESHOLD=0.85
+   ```
+
+2. **Update Search Calls**:
+
+   ```typescript
+   // Old way (hardcoded 0.7)
+   const results = await service.vectorSearch(query, limit, category, 0.7);
+
+   // New way (uses environment variable)
+   const results = await service.vectorSearch(query, limit, category);
+   ```
+
+3. **Test New Thresholds**:
+
+   ```bash
+   # Test with current threshold
+   curl -X GET http://localhost:3000/api/pgvector/threshold
+
+   # Adjust if needed
+   curl -X POST http://localhost:3000/api/pgvector/threshold \
+     -H "Content-Type: application/json" \
+     -d '{"threshold": 0.90}'
+   ```

package.json

@@ -7,7 +7,7 @@
   "license": "UNLICENSED",
   "scripts": {
     "build": "nest build",
-    "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
+    "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\" \"prisma/seed/**/*.ts\"",
     "start": "nest start",
     "start:dev": "nest start --watch",
     "start:debug": "nest start --debug --watch",
@@ -17,7 +17,9 @@
     "test:watch": "jest --watch",
     "test:cov": "jest --coverage",
     "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
-    "test:e2e": "jest --config ./test/jest-e2e.json"
+    "test:e2e": "jest --config ./test/jest-e2e.json",
+    "seed": "ts-node -r tsconfig-paths/register prisma/seed/seed.ts",
+    "seed:icd": "ts-node -r tsconfig-paths/register prisma/seed/icd/icd.seed.ts"
   },
   "dependencies": {
     "@langchain/community": "^0.3.53",

prisma/seed/icd/icd.seed.ts

@@ -0,0 +1,170 @@
+import { PrismaClient } from '@prisma/client';
+import * as XLSX from 'xlsx';
+import * as path from 'path';
+import * as fs from 'fs';
+
+interface IcdData {
+  code: string;
+  display: string;
+  version: string;
+}
+
+export class IcdSeeder {
+  private readonly prisma = new PrismaClient();
+
+  async seed(): Promise<{
+    icd9Count: number;
+    icd10Count: number;
+    total: number;
+  }> {
+    try {
+      console.log('Starting ICD data import...');
+
+      // Import ICD-9 data
+      const icd9Data = this.readExcelFile(
+        'prisma/seed/icd/[PUBLIC] ICD-9CM e-klaim.xlsx',
+        'ICD9',
+      );
+
+      // Import ICD-10 data
+      const icd10Data = this.readExcelFile(
+        'prisma/seed/icd/[PUBLIC] ICD-10 e-klaim.xlsx',
+        'ICD10',
+      );
+
+      // Clear existing data
+      await this.prisma.icdCode.deleteMany({});
+      console.log('Cleared existing ICD data');
+
+      // Insert ICD-9 data
+      const icd9Count = await this.bulkInsertData(icd9Data, 'ICD9');
+      console.log(`Imported ${icd9Count} ICD-9 codes`);
+
+      // Insert ICD-10 data
+      const icd10Count = await this.bulkInsertData(icd10Data, 'ICD10');
+      console.log(`Imported ${icd10Count} ICD-10 codes`);
+
+      const total = icd9Count + icd10Count;
+      console.log(`Total imported: ${total} ICD codes`);
+
+      return {
+        icd9Count,
+        icd10Count,
+        total,
+      };
+    } catch (error) {
+      console.error('Error importing ICD data:', error);
+      throw error;
+    }
+  }
+
+  private readExcelFile(filePath: string, category: string): IcdData[] {
+    try {
+      const fullPath = path.join(process.cwd(), filePath);
+
+      if (!fs.existsSync(fullPath)) {
+        throw new Error(`File not found: ${fullPath}`);
+      }
+
+      console.log(`Reading ${category} file: ${filePath}`);
+
+      const workbook = XLSX.readFile(fullPath);
+      const sheetName = workbook.SheetNames[0];
+      const worksheet = workbook.Sheets[sheetName];
+
+      // Convert sheet to JSON
+      const jsonData = XLSX.utils.sheet_to_json(worksheet, { header: 1 });
+
+      // Skip header row and process data
+      const icdData: IcdData[] = [];
+
+      for (let i = 1; i < jsonData.length; i++) {
+        const row = jsonData[i] as any[];
+
+        if (row && row.length >= 3) {
+          const code = this.cleanString(row[0]);
+          const display = this.cleanString(row[1]);
+          const version = this.cleanString(row[2]);
+
+          if (code && display && version) {
+            icdData.push({
+              code,
+              display,
+              version,
+            });
+          }
+        }
+      }
+
+      console.log(`Found ${icdData.length} valid ${category} records`);
+      return icdData;
+    } catch (error) {
+      console.error(`Error reading ${category} file:`, error);
+      throw error;
+    }
+  }
+
+  private async bulkInsertData(
+    data: IcdData[],
+    category: string,
+  ): Promise<number> {
+    try {
+      const batchSize = 1000;
+      let totalInserted = 0;
+
+      for (let i = 0; i < data.length; i += batchSize) {
+        const batch = data.slice(i, i + batchSize);
+
+        const insertData = batch.map((item) => ({
+          code: item.code,
+          display: item.display,
+          version: item.version,
+          category,
+        }));
+
+        await this.prisma.icdCode.createMany({
+          data: insertData,
+          skipDuplicates: true,
+        });
+
+        totalInserted += batch.length;
+        console.log(
+          `Inserted batch ${Math.floor(i / batchSize) + 1} for ${category}: ${batch.length} records`,
+        );
+      }
+
+      return totalInserted;
+    } catch (error) {
+      console.error(`Error inserting ${category} data:`, error);
+      throw error;
+    }
+  }
+
+  private cleanString(value: any): string {
+    if (value === null || value === undefined) {
+      return '';
+    }
+    return String(value).trim();
+  }
+
+  async disconnect() {
+    await this.prisma.$disconnect();
+  }
+}
+
+// Standalone execution
+if (require.main === module) {
+  const seeder = new IcdSeeder();
+  seeder
+    .seed()
+    .then((result) => {
+      console.log('ICD seeding completed successfully:', result);
+    })
+    .catch((error) => {
+      console.error('ICD seeding failed:', error);
+      process.exit(1);
+    })
+    .finally(() => {
+      void seeder.disconnect();
+    });
+}

prisma/seed/seed.ts

@@ -0,0 +1,27 @@
+import { PrismaClient } from '@prisma/client';
+import { IcdSeeder } from './icd/icd.seed';
+
+const prisma = new PrismaClient();
+
+async function main() {
+  console.log('Starting database seeding...');
+
+  try {
+    // Seed ICD data
+    const icdSeeder = new IcdSeeder();
+    const icdResult = await icdSeeder.seed();
+    console.log('ICD seeding completed:', icdResult);
+    await icdSeeder.disconnect();
+
+    console.log('Database seeding completed successfully!');
+  } catch (error) {
+    console.error('Error during seeding:', error);
+    throw error;
+  }
+}
+
+main()
+  .catch(console.error)
+  .finally(() => {
+    void prisma.$disconnect();
+  });

src/health/health.controller.ts

@@ -64,7 +64,7 @@ export class HealthController {
     status: 200,
     description: 'Application is ready',
   })
-  async getReady() {
+  getReady() {
     return { status: 'ready' };
   }
 
@@ -77,7 +77,7 @@ export class HealthController {
     status: 200,
     description: 'Application is alive',
   })
-  async getLive() {
+  getLive() {
     return { status: 'alive' };
   }
 }

src/icd/icd.controller.ts

@@ -1,4 +1,4 @@
-import { Controller, Get, Post, Query, Logger } from '@nestjs/common';
+import { Controller, Get, Query, Logger } from '@nestjs/common';
 import {
   ApiTags,
   ApiOperation,
@@ -8,10 +8,8 @@ import {
   ApiInternalServerErrorResponse,
 } from '@nestjs/swagger';
 import { IcdService } from './icd.service';
-import { SearchIcdDto } from './dto/search-icd.dto';
 import {
   IcdSearchResponseDto,
-  IcdImportResponseDto,
   IcdStatisticsResponseDto,
   ErrorResponseDto,
 } from './dto/icd-response.dto';
@@ -23,40 +21,6 @@ export class IcdController {
 
   constructor(private readonly icdService: IcdService) {}
 
-  @Post('import')
-  @ApiOperation({
-    summary: 'Import ICD data from Excel files',
-    description:
-      'Import ICD-9 and ICD-10 codes from Excel files located in the test directory. This operation will process both ICD files and insert/update the database with the latest codes.',
-  })
-  @ApiResponse({
-    status: 200,
-    description: 'ICD data imported successfully',
-    type: IcdImportResponseDto,
-  })
-  @ApiBadRequestResponse({
-    description: 'Bad request - Invalid file format or missing files',
-    type: ErrorResponseDto,
-  })
-  @ApiInternalServerErrorResponse({
-    description: 'Internal server error during import process',
-    type: ErrorResponseDto,
-  })
-  async importData(): Promise<IcdImportResponseDto> {
-    try {
-      this.logger.log('Starting ICD data import...');
-      const result = await this.icdService.importIcdData();
-      return {
-        success: true,
-        message: 'ICD data imported successfully',
-        data: result,
-      };
-    } catch (error) {
-      this.logger.error('Error importing ICD data:', error);
-      throw error;
-    }
-  }
-
   @Get('search')
   @ApiOperation({
     summary: 'Search ICD codes with filters and pagination',

src/icd/icd.service.ts

@@ -1,158 +1,11 @@
 import { Injectable, Logger } from '@nestjs/common';
-import { PrismaClient } from '../../generated/prisma';
+import { PrismaClient } from '@prisma/client';
-import * as XLSX from 'xlsx';
-import * as path from 'path';
-import * as fs from 'fs';
-
-interface IcdData {
-  code: string;
-  display: string;
-  version: string;
-}
 
 @Injectable()
 export class IcdService {
   private readonly logger = new Logger(IcdService.name);
   private readonly prisma = new PrismaClient();
 
-  async importIcdData(): Promise<{
-    icd9Count: number;
-    icd10Count: number;
-    total: number;
-  }> {
-    try {
-      this.logger.log('Starting ICD data import...');
-
-      // Import ICD-9 data
-      const icd9Data = await this.readExcelFile(
-        'test/[PUBLIC] ICD-9CM e-klaim.xlsx',
-        'ICD9',
-      );
-
-      // Import ICD-10 data
-      const icd10Data = await this.readExcelFile(
-        'test/[PUBLIC] ICD-10 e-klaim.xlsx',
-        'ICD10',
-      );
-
-      // Clear existing data
-      await this.prisma.icdCode.deleteMany({});
-      this.logger.log('Cleared existing ICD data');
-
-      // Insert ICD-9 data
-      const icd9Count = await this.bulkInsertData(icd9Data, 'ICD9');
-      this.logger.log(`Imported ${icd9Count} ICD-9 codes`);
-
-      // Insert ICD-10 data
-      const icd10Count = await this.bulkInsertData(icd10Data, 'ICD10');
-      this.logger.log(`Imported ${icd10Count} ICD-10 codes`);
-
-      const total = icd9Count + icd10Count;
-      this.logger.log(`Total imported: ${total} ICD codes`);
-
-      return {
-        icd9Count,
-        icd10Count,
-        total,
-      };
-    } catch (error) {
-      this.logger.error('Error importing ICD data:', error);
-      throw error;
-    }
-  }
-
-  private async readExcelFile(
-    filePath: string,
-    category: string,
-  ): Promise<IcdData[]> {
-    try {
-      const fullPath = path.join(process.cwd(), filePath);
-
-      if (!fs.existsSync(fullPath)) {
-        throw new Error(`File not found: ${fullPath}`);
-      }
-
-      this.logger.log(`Reading ${category} file: ${filePath}`);
-
-      const workbook = XLSX.readFile(fullPath);
-      const sheetName = workbook.SheetNames[0];
-      const worksheet = workbook.Sheets[sheetName];
-
-      // Convert sheet to JSON
-      const jsonData = XLSX.utils.sheet_to_json(worksheet, { header: 1 });
-
-      // Skip header row and process data
-      const icdData: IcdData[] = [];
-
-      for (let i = 1; i < jsonData.length; i++) {
-        const row = jsonData[i] as any[];
-
-        if (row && row.length >= 3) {
-          const code = this.cleanString(row[0]);
-          const display = this.cleanString(row[1]);
-          const version = this.cleanString(row[2]);
-
-          if (code && display && version) {
-            icdData.push({
-              code,
-              display,
-              version,
-            });
-          }
-        }
-      }
-
-      this.logger.log(`Found ${icdData.length} valid ${category} records`);
-      return icdData;
-    } catch (error) {
-      this.logger.error(`Error reading ${category} file:`, error);
-      throw error;
-    }
-  }
-
-  private async bulkInsertData(
-    data: IcdData[],
-    category: string,
-  ): Promise<number> {
-    try {
-      const batchSize = 1000;
-      let totalInserted = 0;
-
-      for (let i = 0; i < data.length; i += batchSize) {
-        const batch = data.slice(i, i + batchSize);
-
-        const insertData = batch.map((item) => ({
-          code: item.code,
-          display: item.display,
-          version: item.version,
-          category,
-        }));
-
-        await this.prisma.icdCode.createMany({
-          data: insertData,
-          skipDuplicates: true,
-        });
-
-        totalInserted += batch.length;
-        this.logger.log(
-          `Inserted batch ${Math.floor(i / batchSize) + 1} for ${category}: ${batch.length} records`,
-        );
-      }
-
-      return totalInserted;
-    } catch (error) {
-      this.logger.error(`Error inserting ${category} data:`, error);
-      throw error;
-    }
-  }
-
-  private cleanString(value: any): string {
-    if (value === null || value === undefined) {
-      return '';
-    }
-    return String(value).trim();
-  }
-
   async findIcdCodes(
     category?: string,
     search?: string,

src/icd/pgvector.controller.ts

@@ -8,6 +8,15 @@ import {
   ValidationPipe,
   UsePipes,
 } from '@nestjs/common';
+import {
+  IsString,
+  IsOptional,
+  IsNumber,
+  IsEnum,
+  Min,
+  Max,
+  IsNotEmpty,
+} from 'class-validator';
 import {
   ApiTags,
   ApiOperation,
@@ -27,6 +36,8 @@ export class VectorSearchDto {
     minLength: 1,
     maxLength: 500,
   })
+  @IsString()
+  @IsNotEmpty()
   query: string;
 
   @ApiProperty({
@@ -37,6 +48,10 @@ export class VectorSearchDto {
     maximum: 100,
     default: 10,
   })
+  @IsOptional()
+  @IsNumber()
+  @Min(1)
+  @Max(100)
   limit?: number;
 
   @ApiProperty({
@@ -46,16 +61,22 @@ export class VectorSearchDto {
     enum: ['ICD9', 'ICD10'],
     default: undefined,
   })
+  @IsOptional()
+  @IsEnum(['ICD9', 'ICD10'])
   category?: string;
 
   @ApiProperty({
     description: 'Similarity threshold (0.0 - 1.0) for filtering results',
-    example: 0.7,
+    example: 0.85,
     required: false,
     minimum: 0.0,
     maximum: 1.0,
-    default: 0.7,
+    default: 0.85,
   })
+  @IsOptional()
+  @IsNumber()
+  @Min(0.0)
+  @Max(1.0)
   threshold?: number;
 }
 
@@ -66,6 +87,8 @@ export class EmbeddingRequestDto {
     minLength: 1,
     maxLength: 1000,
   })
+  @IsString()
+  @IsNotEmpty()
   text: string;
 
   @ApiProperty({
@@ -74,9 +97,24 @@ export class EmbeddingRequestDto {
     required: false,
     default: 'text-embedding-ada-002',
   })
+  @IsOptional()
+  @IsString()
   model?: string;
 }
 
+export class ThresholdConfigDto {
+  @ApiProperty({
+    description: 'Similarity threshold value (0.0 - 1.0)',
+    example: 0.85,
+    minimum: 0.0,
+    maximum: 1.0,
+  })
+  @IsNumber()
+  @Min(0.0)
+  @Max(1.0)
+  threshold: number;
+}
+
 export class VectorSearchResponseDto {
   @ApiProperty({
     description: 'Array of search results with similarity scores',
@@ -486,6 +524,61 @@ export class PgVectorController {
     };
   }
 
+  @Post('advanced-search')
+  @ApiOperation({
+    summary: 'Advanced vector similarity search',
+    description:
+      'Advanced vector search using multiple similarity metrics (cosine + euclidean) for more accurate results with higher threshold.',
+    tags: ['PgVector Operations'],
+  })
+  @ApiConsumes('application/json')
+  @ApiProduces('application/json')
+  @ApiBody({
+    type: VectorSearchDto,
+    description: 'Search parameters for advanced vector search',
+    examples: {
+      highPrecision: {
+        summary: 'High precision search',
+        value: {
+          query: 'diabetes mellitus type 2',
+          limit: 10,
+          category: 'ICD10',
+          threshold: 0.9,
+        },
+      },
+    },
+  })
+  @ApiResponse({
+    status: HttpStatus.OK,
+    description:
+      'Advanced vector search results with enhanced similarity scores',
+    type: VectorSearchResponseDto,
+  })
+  @ApiResponse({
+    status: HttpStatus.BAD_REQUEST,
+    description: 'Invalid search parameters',
+  })
+  @ApiResponse({
+    status: HttpStatus.INTERNAL_SERVER_ERROR,
+    description: 'Error during advanced vector search',
+  })
+  async advancedVectorSearch(
+    @Body() searchDto: VectorSearchDto,
+  ): Promise<VectorSearchResponseDto> {
+    const results = await this.pgVectorService.advancedVectorSearch(
+      searchDto.query,
+      searchDto.limit || 10,
+      searchDto.category,
+      searchDto.threshold,
+    );
+
+    return {
+      data: results,
+      total: results.length,
+      query: searchDto.query,
+    };
+  }
+
   @Post('generate-embedding')
   @ApiOperation({
     summary: 'Generate text embedding',
@@ -570,6 +663,50 @@ export class PgVectorController {
     };
   }
 
+  @Post('regenerate-embeddings-enhanced')
+  @ApiOperation({
+    summary: 'Regenerate embeddings with enhanced text representation',
+    description:
+      'Regenerate existing embeddings using enhanced text representation for better similarity scores. This improves search quality.',
+    tags: ['PgVector Operations'],
+  })
+  @ApiConsumes('application/json')
+  @ApiProduces('application/json')
+  @ApiResponse({
+    status: HttpStatus.OK,
+    description: 'Enhanced embedding regeneration results summary',
+    schema: {
+      type: 'object',
+      properties: {
+        processed: { type: 'number', example: 100 },
+        errors: { type: 'number', example: 0 },
+        totalSample: { type: 'number', example: 100 },
+        message: {
+          type: 'string',
+          example: 'Enhanced embeddings regenerated successfully',
+        },
+      },
+    },
+  })
+  @ApiResponse({
+    status: HttpStatus.INTERNAL_SERVER_ERROR,
+    description: 'Error during enhanced embedding regeneration',
+  })
+  async regenerateEmbeddingsEnhanced(): Promise<{
+    processed: number;
+    errors: number;
+    totalSample: number;
+    message: string;
+  }> {
+    const result =
+      await this.pgVectorService.regenerateEmbeddingsWithEnhancedText();
+
+    return {
+      ...result,
+      message: `Enhanced embeddings regenerated successfully. Processed: ${result.processed}, Errors: ${result.errors}`,
+    };
+  }
+
   @Get('stats')
   @ApiOperation({
     summary: 'Get embedding statistics',
@@ -640,6 +777,234 @@ export class PgVectorController {
     };
   }
 
+  @Get('threshold')
+  @ApiOperation({
+    summary: 'Get current similarity threshold',
+    description:
+      'Get the current similarity threshold configuration used for vector search filtering.',
+    tags: ['PgVector Operations'],
+  })
+  @ApiProduces('application/json')
+  @ApiResponse({
+    status: HttpStatus.OK,
+    description: 'Current similarity threshold configuration',
+    schema: {
+      type: 'object',
+      properties: {
+        threshold: {
+          type: 'number',
+          description: 'Current similarity threshold value',
+          example: 0.85,
+        },
+        description: {
+          type: 'string',
+          description: 'Description of the threshold setting',
+          example: 'Minimum similarity score required for search results',
+        },
+      },
+    },
+  })
+  @ApiResponse({
+    status: HttpStatus.INTERNAL_SERVER_ERROR,
+    description: 'Error retrieving threshold configuration',
+  })
+  async getSimilarityThreshold(): Promise<{
+    threshold: number;
+    description: string;
+  }> {
+    const threshold = this.pgVectorService.getSimilarityThreshold();
+    return {
+      threshold,
+      description:
+        'Minimum similarity score required for search results (0.0 - 1.0)',
+    };
+  }
+
+  @Get('model')
+  @ApiOperation({
+    summary: 'Get current embedding model',
+    description:
+      'Get the current OpenAI embedding model configuration used for vector generation.',
+    tags: ['PgVector Operations'],
+  })
+  @ApiProduces('application/json')
+  @ApiResponse({
+    status: HttpStatus.OK,
+    description: 'Current embedding model configuration',
+    schema: {
+      type: 'object',
+      properties: {
+        model: {
+          type: 'string',
+          description: 'Current embedding model name',
+          example: 'text-embedding-ada-002',
+        },
+        description: {
+          type: 'string',
+          description: 'Description of the model configuration',
+          example: 'OpenAI embedding model for vector generation',
+        },
+        source: {
+          type: 'string',
+          description: 'Source of the model configuration',
+          example: 'Environment Variable',
+        },
+      },
+    },
+  })
+  @ApiResponse({
+    status: HttpStatus.INTERNAL_SERVER_ERROR,
+    description: 'Error retrieving model configuration',
+  })
+  async getEmbeddingModel(): Promise<{
+    model: string;
+    description: string;
+    source: string;
+  }> {
+    const model = this.pgVectorService.getEmbeddingModel();
+    const source = process.env.OPENAI_API_MODEL
+      ? 'Environment Variable'
+      : 'Default';
+
+    return {
+      model,
+      description: 'OpenAI embedding model for vector generation',
+      source,
+    };
+  }
+
+  @Post('threshold')
+  @ApiOperation({
+    summary: 'Set similarity threshold',
+    description:
+      'Set the similarity threshold for vector search filtering. Higher values result in more strict matching.',
+    tags: ['PgVector Operations'],
+  })
+  @ApiConsumes('application/json')
+  @ApiProduces('application/json')
+  @ApiBody({
+    type: ThresholdConfigDto,
+    description: 'Threshold configuration parameters',
+  })
+  @ApiResponse({
+    status: HttpStatus.OK,
+    description: 'Similarity threshold updated successfully',
+    schema: {
+      type: 'object',
+      properties: {
+        message: {
+          type: 'string',
+          description: 'Success message',
+          example: 'Similarity threshold updated successfully',
+        },
+        threshold: {
+          type: 'number',
+          description: 'Updated threshold value',
+          example: 0.9,
+        },
+        previousThreshold: {
+          type: 'number',
+          description: 'Previous threshold value',
+          example: 0.85,
+        },
+      },
+    },
+  })
+  @ApiResponse({
+    status: HttpStatus.BAD_REQUEST,
+    description: 'Invalid threshold value (must be between 0.0 and 1.0)',
+  })
+  @ApiResponse({
+    status: HttpStatus.INTERNAL_SERVER_ERROR,
+    description: 'Error updating threshold configuration',
+  })
+  async setSimilarityThreshold(
+    @Body() thresholdConfig: ThresholdConfigDto,
+  ): Promise<{
+    message: string;
+    threshold: number;
+    previousThreshold: number;
+  }> {
+    const previousThreshold = this.pgVectorService.getSimilarityThreshold();
+    this.pgVectorService.setSimilarityThreshold(thresholdConfig.threshold);
+
+    return {
+      message: 'Similarity threshold updated successfully',
+      threshold: thresholdConfig.threshold,
+      previousThreshold,
+    };
+  }
+
+  @Post('model')
+  @ApiOperation({
+    summary: 'Set embedding model',
+    description:
+      'Set the OpenAI embedding model for vector generation. This will reinitialize the embeddings service.',
+    tags: ['PgVector Operations'],
+  })
+  @ApiConsumes('application/json')
+  @ApiProduces('application/json')
+  @ApiBody({
+    schema: {
+      type: 'object',
+      properties: {
+        model: {
+          type: 'string',
+          description: 'OpenAI embedding model name',
+          example: 'text-embedding-ada-002',
+        },
+      },
+      required: ['model'],
+    },
+    description: 'Model configuration parameters',
+  })
+  @ApiResponse({
+    status: HttpStatus.OK,
+    description: 'Embedding model updated successfully',
+    schema: {
+      type: 'object',
+      properties: {
+        message: {
+          type: 'string',
+          description: 'Success message',
+          example: 'Embedding model updated successfully',
+        },
+        model: {
+          type: 'string',
+          description: 'Updated model name',
+          example: 'text-embedding-ada-002',
+        },
+        previousModel: {
+          type: 'string',
+          description: 'Previous model name',
+          example: 'text-embedding-ada-002',
+        },
+      },
+    },
+  })
+  @ApiResponse({
+    status: HttpStatus.BAD_REQUEST,
+    description: 'Invalid model name',
+  })
+  @ApiResponse({
+    status: HttpStatus.INTERNAL_SERVER_ERROR,
+    description: 'Error updating model configuration',
+  })
+  async setEmbeddingModel(@Body() body: { model: string }): Promise<{
+    message: string;
+    model: string;
+    previousModel: string;
+  }> {
+    const previousModel = this.pgVectorService.getEmbeddingModel();
+    await this.pgVectorService.setEmbeddingModel(body.model);
+
+    return {
+      message: 'Embedding model updated successfully',
+      model: body.model,
+      previousModel,
+    };
+  }
+
   @Post('refresh')
   @ApiOperation({
     summary: 'Refresh pgvector store',

src/icd/pgvector.service.ts

@@ -1,8 +1,7 @@
 import { Injectable, Logger } from '@nestjs/common';
-import { PrismaClient } from '../../generated/prisma';
+import { PrismaClient } from '@prisma/client';
 import { OpenAIEmbeddings } from '@langchain/openai';
 import { PGVectorStore } from '@langchain/community/vectorstores/pgvector';
-import { Document } from 'langchain/document';
 import { Pool } from 'pg';
 
 export interface VectorSearchResult {
@@ -72,6 +71,41 @@ export class PgVectorService {
     }
   }
 
+  /**
+   * Reinitialize OpenAI embeddings with new model
+   */
+  private async reinitializeEmbeddings(modelName: string): Promise<void> {
+    try {
+      const apiKey = process.env.OPENAI_API_KEY;
+      if (!apiKey) {
+        throw new Error('OPENAI_API_KEY not found');
+      }
+
+      this.logger.log(
+        `Reinitializing OpenAI embeddings with model: ${modelName}`,
+      );
+
+      // Create new embeddings instance with new model
+      this.embeddings = new OpenAIEmbeddings({
+        openAIApiKey: apiKey,
+        modelName: modelName,
+        maxConcurrency: 5,
+      });
+
+      // Update environment variable to reflect current model
+      process.env.OPENAI_API_MODEL = modelName;
+
+      this.logger.log(
+        `OpenAI embeddings reinitialized successfully with model: ${modelName}`,
+      );
+    } catch (error) {
+      this.logger.error('Failed to reinitialize OpenAI embeddings:', error);
+      throw new Error(
+        `Failed to reinitialize OpenAI embeddings: ${error.message}`,
+      );
+    }
+  }
+
   /**
    * Initialize pgvector store dengan LangChain
    */
@@ -115,25 +149,35 @@ export class PgVectorService {
   /**
    * Generate embedding untuk text menggunakan OpenAI
    */
-  async generateEmbedding(
+  async generateEmbedding(text: string, model?: string): Promise<number[]> {
-    text: string,
-    model: string = 'text-embedding-ada-002',
-  ): Promise<number[]> {
     try {
+      // Get model from parameter, environment variable, or use default
+      const embeddingModel =
+        model || process.env.OPENAI_API_MODEL || 'text-embedding-ada-002';
+
       this.logger.log(
-        `Generating embedding for text: ${text.substring(0, 100)}...`,
+        `Generating embedding for text: ${text.substring(0, 100)}... using model: ${embeddingModel}`,
       );
 
+      // Check if we need to reinitialize embeddings with new model
+      const currentModel = this.getEmbeddingModel();
+      if (model && model !== currentModel) {
+        this.logger.log(
+          `Switching embedding model from ${currentModel} to ${model}`,
+        );
+        await this.reinitializeEmbeddings(model);
+      }
+
       if (!this.embeddings) {
         throw new Error(
           'OpenAI embeddings not initialized. Please check your API configuration.',
         );
       }
 
-      // Use OpenAI embeddings
+      // Use OpenAI embeddings with current model
       const embedding = await this.embeddings.embedQuery(text);
       this.logger.log(
-        `Generated OpenAI embedding with ${embedding.length} dimensions`,
+        `Generated OpenAI embedding with ${embedding.length} dimensions using model: ${this.getEmbeddingModel()}`,
       );
       return embedding;
     } catch (error) {
@@ -191,7 +235,8 @@ export class PgVectorService {
             `UPDATE icd_codes 
              SET embedding = $1::vector, 
                  metadata = $2::jsonb, 
-                 content = $3 
+                 content = $3,
+                 "updatedAt" = NOW()
              WHERE id = $4`,
             [
               vectorString,
@@ -289,7 +334,8 @@ export class PgVectorService {
             `UPDATE icd_codes 
              SET embedding = $1::vector, 
                  metadata = $2::jsonb, 
-                 content = $3 
+                 content = $3,
+                 "updatedAt" = NOW()
              WHERE id = $4`,
             [
               vectorString,
@@ -337,16 +383,23 @@ export class PgVectorService {
   }
 
   /**
-   * Vector similarity search menggunakan pgvector
+   * Vector similarity search menggunakan pgvector dengan threshold yang dapat dikonfigurasi
    */
   async vectorSearch(
     query: string,
     limit: number = 10,
     category?: string,
-    threshold: number = 0.7,
+    threshold?: number,
   ): Promise<VectorSearchResult[]> {
+    // Get threshold from environment variable or use default
+    const defaultThreshold = parseFloat(
+      process.env.VECTOR_SIMILARITY_THRESHOLD || '0.85',
+    );
+    const similarityThreshold = threshold || defaultThreshold;
     try {
-      this.logger.log(`Performing pgvector search for: ${query}`);
+      this.logger.log(
+        `Performing pgvector search for: ${query} with threshold: ${similarityThreshold}`,
+      );
 
       if (!this.embeddings) {
         throw new Error('OpenAI embeddings not initialized');
@@ -358,17 +411,19 @@ export class PgVectorService {
       // Convert embedding array to proper vector format for pgvector
       const vectorString = `[${queryEmbedding.join(',')}]`;
 
-      // Build SQL query for vector similarity search
+      // Build SQL query for vector similarity search with higher precision
+      // Using cosine distance and converting to similarity score
       let sql = `
         SELECT 
           id, code, display, version, category,
-          1 - (embedding <=> $1::vector) as similarity
+          (1 - (embedding <=> $1::vector)) as similarity
         FROM icd_codes 
         WHERE embedding IS NOT NULL
+          AND (1 - (embedding <=> $1::vector)) >= $2
       `;
 
-      const params: any[] = [vectorString];
+      const params: any[] = [vectorString, similarityThreshold];
-      let paramIndex = 2;
+      let paramIndex = 3;
 
       if (category) {
         sql += ` AND category = $${paramIndex}`;
@@ -376,23 +431,24 @@ export class PgVectorService {
         paramIndex++;
       }
 
-      sql += ` ORDER BY embedding <=> $1::vector ASC LIMIT $${paramIndex}`;
+      // Order by similarity descending and limit results
+      sql += ` ORDER BY similarity DESC LIMIT $${paramIndex}`;
       params.push(limit);
 
       // Execute raw SQL query
       const result = await this.pool.query(sql, params);
 
-      // Transform and filter results
+      // Transform results (no need to filter again since SQL already filters)
-      const filteredResults: VectorSearchResult[] = result.rows
+      const filteredResults: VectorSearchResult[] = result.rows.map(
-        .filter((row: any) => row.similarity >= threshold)
+        (row: any) => ({
-        .map((row: any) => ({
           id: row.id,
           code: row.code,
           display: row.display,
           version: row.version,
           category: row.category,
           similarity: parseFloat(row.similarity),
-        }));
+        }),
+      );
 
       this.logger.log(
         `Pgvector search returned ${filteredResults.length} results for query: "${query}"`,
@@ -417,12 +473,12 @@ export class PgVectorService {
     try {
       this.logger.log(`Performing hybrid search for: ${query}`);
 
-      // Get vector search results
+      // Get vector search results with higher threshold
       const vectorResults = await this.vectorSearch(
         query,
         limit * 2,
         category,
-        0.5,
+        parseFloat(process.env.VECTOR_SIMILARITY_THRESHOLD || '0.85'),
       );
 
       // Get text search results
@@ -475,7 +531,7 @@ export class PgVectorService {
     try {
       let sql = 'SELECT id, code, display, version, category FROM icd_codes';
       const params: any[] = [];
-      let whereConditions: string[] = [];
+      const whereConditions: string[] = [];
       let paramIndex = 1;
 
       if (category) {
@@ -515,6 +571,51 @@ export class PgVectorService {
     }
   }
 
+  /**
+   * Get current similarity threshold configuration
+   */
+  getSimilarityThreshold(): number {
+    return parseFloat(process.env.VECTOR_SIMILARITY_THRESHOLD || '0.85');
+  }
+
+  /**
+   * Get current embedding model configuration
+   */
+  getEmbeddingModel(): string {
+    return process.env.OPENAI_API_MODEL || 'text-embedding-ada-002';
+  }
+
+  /**
+   * Set similarity threshold (for runtime configuration)
+   */
+  setSimilarityThreshold(threshold: number): void {
+    if (threshold < 0 || threshold > 1) {
+      throw new Error('Similarity threshold must be between 0 and 1');
+    }
+    process.env.VECTOR_SIMILARITY_THRESHOLD = threshold.toString();
+    this.logger.log(`Similarity threshold updated to: ${threshold}`);
+  }
+
+  /**
+   * Set embedding model (for runtime configuration)
+   */
+  async setEmbeddingModel(modelName: string): Promise<void> {
+    if (!modelName || typeof modelName !== 'string') {
+      throw new Error('Model name must be a valid string');
+    }
+
+    const currentModel = this.getEmbeddingModel();
+    if (modelName === currentModel) {
+      this.logger.log(`Model ${modelName} is already active`);
+      return;
+    }
+
+    this.logger.log(
+      `Switching embedding model from ${currentModel} to ${modelName}`,
+    );
+    await this.reinitializeEmbeddings(modelName);
+  }
+
   /**
    * Get embedding statistics
    */
@@ -524,6 +625,7 @@ export class PgVectorService {
     withoutEmbeddings: number;
     percentage: number;
     vectorStoreStatus: string;
+    currentThreshold: number;
   }> {
     try {
       // Use raw SQL to get embedding statistics
@@ -548,6 +650,7 @@ export class PgVectorService {
         withoutEmbeddings,
         percentage: Math.round(percentage * 100) / 100,
         vectorStoreStatus,
+        currentThreshold: this.getSimilarityThreshold(),
       };
     } catch (error) {
       this.logger.error('Error getting embedding stats:', error);
@@ -569,6 +672,95 @@ export class PgVectorService {
     }
   }
 
+  /**
+   * Advanced vector search dengan multiple similarity metrics untuk mendapatkan hasil yang lebih akurat
+   */
+  async advancedVectorSearch(
+    query: string,
+    limit: number = 10,
+    category?: string,
+    threshold?: number,
+  ): Promise<VectorSearchResult[]> {
+    try {
+      // Get threshold from environment variable or use default
+      const defaultThreshold = parseFloat(
+        process.env.VECTOR_SIMILARITY_THRESHOLD || '0.85',
+      );
+      const similarityThreshold = threshold || defaultThreshold;
+
+      this.logger.log(
+        `Performing advanced vector search for: ${query} with threshold: ${similarityThreshold}`,
+      );
+
+      if (!this.embeddings) {
+        throw new Error('OpenAI embeddings not initialized');
+      }
+
+      // Generate embedding for query
+      const queryEmbedding = await this.generateEmbedding(query);
+      const vectorString = `[${queryEmbedding.join(',')}]`;
+
+      // Advanced SQL query using multiple similarity metrics
+      let sql = `
+        SELECT 
+          id, code, display, version, category,
+          (1 - (embedding <=> $1::vector)) as cosine_similarity,
+          (1 - (embedding <-> $1::vector)) as euclidean_similarity,
+          (embedding <#> $1::vector) as negative_inner_product
+        FROM icd_codes 
+        WHERE embedding IS NOT NULL
+      `;
+
+      const params: any[] = [vectorString];
+      let paramIndex = 2;
+
+      if (category) {
+        sql += ` AND category = $${paramIndex}`;
+        params.push(category);
+        paramIndex++;
+      }
+
+      // Filter by cosine similarity threshold
+      sql += ` AND (1 - (embedding <=> $1::vector)) >= $${paramIndex}`;
+      params.push(similarityThreshold);
+      paramIndex++;
+
+      // Order by combined similarity score and limit
+      sql += ` ORDER BY cosine_similarity DESC, euclidean_similarity DESC LIMIT $${paramIndex}`;
+      params.push(limit);
+
+      const result = await this.pool.query(sql, params);
+
+      // Transform results with enhanced similarity scoring
+      const filteredResults: VectorSearchResult[] = result.rows.map(
+        (row: any) => {
+          const cosineSim = parseFloat(row.cosine_similarity);
+          const euclideanSim = parseFloat(row.euclidean_similarity);
+
+          // Calculate combined similarity score (weighted average)
+          const combinedSimilarity = cosineSim * 0.7 + euclideanSim * 0.3;
+
+          return {
+            id: row.id,
+            code: row.code,
+            display: row.display,
+            version: row.version,
+            category: row.category,
+            similarity: Math.round(combinedSimilarity * 1000) / 1000, // Round to 3 decimal places
+          };
+        },
+      );
+
+      this.logger.log(
+        `Advanced vector search returned ${filteredResults.length} results for query: "${query}" with threshold: ${similarityThreshold}`,
+      );
+      return filteredResults;
+    } catch (error) {
+      this.logger.error('Error in advanced vector search:', error);
+      throw error;
+    }
+  }
+
   /**
    * Get vector store status
    */
@@ -589,9 +781,10 @@ export class PgVectorService {
         initialized: !!this.vectorStore,
         documentCount,
         embeddingModel: this.embeddings
-          ? `OpenAI ${process.env.OPENAI_API_MODEL || 'text-embedding-ada-002'}`
+          ? `OpenAI ${this.getEmbeddingModel()}`
           : 'Not Available',
         lastUpdated: new Date(),
+        currentThreshold: this.getSimilarityThreshold(),
       };
 
       return status;
@@ -601,6 +794,164 @@ export class PgVectorService {
     }
   }
 
+  /**
+   * Create enhanced text representation for better embedding quality
+   */
+  private createEnhancedTextRepresentation(code: any): string {
+    // Base text with code and display
+    let text = `${code.code} ${code.display}`;
+
+    // Add category context
+    if (code.category === 'ICD9') {
+      text += ` ICD-9 CM procedure diagnosis`;
+    } else if (code.category === 'ICD10') {
+      text += ` ICD-10 diagnosis condition`;
+    }
+
+    // Add version context
+    if (code.version) {
+      text += ` ${code.version}`;
+    }
+
+    // Add medical context based on display content
+    const display = code.display.toLowerCase();
+
+    // Add procedure context
+    if (
+      display.includes('procedure') ||
+      display.includes('surgery') ||
+      display.includes('operation')
+    ) {
+      text += ' medical procedure surgical intervention';
+    }
+
+    // Add diagnosis context
+    if (
+      display.includes('diagnosis') ||
+      display.includes('condition') ||
+      display.includes('disease')
+    ) {
+      text += ' medical diagnosis clinical condition';
+    }
+
+    // Add anatomical context
+    if (
+      display.includes('cranial') ||
+      display.includes('brain') ||
+      display.includes('head')
+    ) {
+      text += ' neurological cranial brain head';
+    }
+
+    if (
+      display.includes('cardiac') ||
+      display.includes('heart') ||
+      display.includes('cardiovascular')
+    ) {
+      text += ' cardiac heart cardiovascular';
+    }
+
+    if (
+      display.includes('pulmonary') ||
+      display.includes('lung') ||
+      display.includes('respiratory')
+    ) {
+      text += ' pulmonary lung respiratory';
+    }
+
+    // Add common medical terms
+    text += ' medical healthcare clinical';
+
+    return text;
+  }
+
+  /**
+   * Regenerate embeddings with enhanced text representation for better similarity
+   */
+  async regenerateEmbeddingsWithEnhancedText(limit: number = 100): Promise<{
+    processed: number;
+    errors: number;
+    totalSample: number;
+  }> {
+    try {
+      this.logger.log(
+        `Starting enhanced embedding regeneration for ${limit} ICD codes...`,
+      );
+
+      // Get ICD codes with existing embeddings to regenerate
+      const codesWithEmbeddings = await this.pool.query(
+        'SELECT id, code, display, version, category FROM icd_codes WHERE embedding IS NOT NULL LIMIT $1',
+        [limit],
+      );
+
+      if (codesWithEmbeddings.rows.length === 0) {
+        this.logger.log('No ICD codes found with embeddings to regenerate');
+        return { processed: 0, errors: 0, totalSample: 0 };
+      }
+
+      this.logger.log(
+        `Found ${codesWithEmbeddings.rows.length} codes to regenerate with enhanced text`,
+      );
+
+      let processed = 0;
+      let errors = 0;
+
+      // Process each code
+      for (let i = 0; i < codesWithEmbeddings.rows.length; i++) {
+        const code = codesWithEmbeddings.rows[i];
+        try {
+          // Create enhanced text representation for better embedding quality
+          const text = this.createEnhancedTextRepresentation(code);
+
+          // Generate new embedding
+          const embedding = await this.generateEmbedding(text);
+
+          // Convert embedding array to proper vector format for pgvector
+          const vectorString = `[${embedding.join(',')}]`;
+
+          // Update database with new embedding and enhanced content
+          await this.pool.query(
+            `UPDATE icd_codes 
+             SET embedding = $1::vector, 
+                 content = $2,
+                 "updatedAt" = NOW()
+             WHERE id = $3`,
+            [vectorString, text, code.id],
+          );
+
+          processed++;
+
+          if (processed % 10 === 0) {
+            this.logger.log(
+              `Regenerated ${processed}/${codesWithEmbeddings.rows.length} enhanced embeddings`,
+            );
+          }
+        } catch (error) {
+          this.logger.error(
+            `Error regenerating embedding for code ${code.code}:`,
+            error,
+          );
+          errors++;
+        }
+      }
+
+      this.logger.log(
+        `Enhanced embedding regeneration completed. Processed: ${processed}, Errors: ${errors}, Total: ${codesWithEmbeddings.rows.length}`,
+      );
+      return {
+        processed,
+        errors,
+        totalSample: codesWithEmbeddings.rows.length,
+      };
+    } catch (error) {
+      this.logger.error(
+        'Error in regenerateEmbeddingsWithEnhancedText:',
+        error,
+      );
+      throw error;
+    }
+  }
+
   /**
    * Cleanup resources
    */