Summary & Overview
HCPCS G9215: CD4+ Count Not Documented
HCPCS Level II code G9215 denotes that a CD4+ cell count or percentage was not documented as performed and no reason was provided. Nationally, accurate documentation of CD4 testing is crucial for monitoring immune status in people with HIV and for quality reporting; codes that capture missing documentation affect clinical quality metrics, billing audits, and compliance reviews. Major payers considered in this context include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
This publication explains the clinical and administrative meaning of G9215, the implications of using a missing-documentation code, and common contexts in which it appears. Readers will find an outline of the service type and typical sites of service, guidance on how this code is used in quality measurement and coding workflows, and a summary of what payers typically review when missing documentation codes are present. The report also highlights related reporting considerations for laboratory-dependent care and the potential impact on performance metrics and audits. Data not available in the input for payer-specific rates, modifiers, associated taxonomies, ICD-10 mappings, or related codes are noted where applicable.
Billing Code Overview
HCPCS Level II code G9215 indicates CD4+ cell count or percentage not documented as performed, reason not given. This code is used to report the absence of documentation for a performed CD4+ lymphocyte measurement when no explanation for the missing documentation is recorded.
Service type: Laboratory/Diagnostic Testing Documentation Reporting
Typical site of service: Outpatient clinic, infectious disease or HIV care setting, and other ambulatory care sites where CD4 testing is ordered and documented
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A patient with known HIV infection presents for routine follow-up of antiretroviral therapy (ART) management. The clinician orders a CD4+ lymphocyte count to monitor immune status and guide opportunistic infection prophylaxis and treatment decisions. A phlebotomy draw is performed at an outpatient infectious disease clinic or primary care office; the specimen is sent to the laboratory for flow cytometry. The laboratory completes testing but the final report in the electronic medical record lacks documentation that the CD4+ cell count or percentage was performed, and no reason for the missing documentation is recorded. Administrative staff identify the omission during a medical record review prior to billing, and code G9215 is used to indicate that the CD4+ cell count or percentage was not documented as performed and no reason is given.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
25 | Significant, separately identifiable evaluation and management service by the same physician on the same day of the procedure or other service | Use when an E/M visit is provided on the same day as specimen collection and meets documentation for a separate E/M |
59 | Distinct procedural service | Use when a separate and distinct laboratory or clinical service is provided on the same day and needs to be distinguished from other services