> ## Documentation Index
> Fetch the complete documentation index at: https://docs.penelope.health/llms.txt
> Use this file to discover all available pages before exploring further.

# Data Coverage

Penelope provides comprehensive coverage data from major US health insurers and Medicare:

### Data Sources

* **Commercial Insurers**: UnitedHealthcare, Cigna, Aetna, Humana, Anthem
* **Medicare**: CMS National Coverage Determinations (NCDs), Local Coverage Determinations (LCDs), and Local Coverage Articles (LCAs)

### Coverage Statistics

#### Medical Coding Systems

* **CPT Codes** (Current Procedural Terminology): \~10,000 procedure codes
* **CPT Modifiers**: \~200 procedure modifiers
* **HCPCS Level 2 Codes**: \~6,500 alphanumeric codes for services and supplies
* **HCPCS Modifiers**: \~50 service modifiers
* **ICD-10-CM Codes** (Diagnosis): \~72,000 diagnosis codes with hierarchical structure
* **ICD-10-PCS Codes** (Procedures): \~78,000 inpatient procedure codes

#### Insurance Coverage Data

* **Insurance Payers**: 5 major US insurers (UnitedHealthcare, Cigna, Aetna, Humana, Anthem)
* **Lines of Business**: Hundreds of lines of business across commercial, Medicare, Medicaid, and exchange markets
* **Medical Policies**: Thousands of coverage policies including:
  * UnitedHealthcare commercial, Medicare Part A/B, Medicare Advantage, Exchange policies
  * Cigna commercial policies
  * Aetna commercial policies
  * Humana commercial and state-specific policies
  * Anthem multi-state policies (abc, abcbs, abcny, abcbs\_va)
  * Medicare NCDs (National Coverage Determinations)
  * Medicare LCDs (Local Coverage Determinations) from 20+ contractors
* **Medicare Contractors**: 20+ Medicare Administrative Contractors (MACs) with state jurisdictions

### Update Frequency

* **Medicare data**: Updated quarterly with CMS releases
* **Commercial policies**: Monitored continuously, updated as payers publish revisions
* **Medical codes**: Updated annually (CPT/HCPCS) or as CMS releases updates (ICD-10-CM)