G9219 HCPCS: PCP Prophylaxis Reimbursement & Policy

HCPCS Level II code G9219 documents a clinical-quality scenario in which Pneumocystis jiroveci pneumonia (PCP) prophylaxis was not started within three months after a patient’s CD4+ count fell below 200 cells/mm3 due to a medical reason: the patient’s CD4+ count subsequently rose above the threshold within that interval, indicating prophylaxis was not required. Nationwide, this code is used in quality reporting and claims to reflect appropriate clinical decision-making tied to dynamic immune status in people with HIV. Key payers in typical analyses include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

Readers will learn what this code represents clinically and administratively, the expected care setting and service type, and how it functions within quality measurement and claims documentation. The publication outlines benchmarking and reporting implications, common contexts for use in outpatient HIV care, and the clinical rationale captured by the code. Data not provided in the input—such as specific modifiers, associated taxonomies, ICD-10 diagnoses, and related codes—are noted as unavailable and are not inferred.

Billing Code Overview

HCPCS Level II code G9219 indicates that Pneumocystis jiroveci pneumonia (PCP) prophylaxis was not prescribed within 3 months of a CD4+ cell count below 200 cells/mm3 for a medical reason. The description clarifies that the medical reason is that the patient’s CD4+ cell count rose above the threshold within 3 months after the low result, indicating the patient did not require PCP prophylaxis.

Service Type: HIV-related prophylaxis management / quality measure reporting

Typical Site of Service: Outpatient clinic or ambulatory care setting where HIV care and laboratory monitoring occur

Data not available in the input.

Clinical Context

A typical patient is an adult living with HIV who had a documented CD4+ T-lymphocyte count below 200 cells/mm3 at an outpatient HIV clinic visit. Within three months following that low CD4+ result, repeat laboratory monitoring shows the CD4+ count has risen above 200 cells/mm3 without initiation of Pneumocystis jiroveci pneumonia (PCP) prophylaxis. The clinical workflow begins with laboratory testing (CD4+ count), review by the HIV clinician or infectious disease specialist, chart review for contraindications or clinical reasons to withhold prophylaxis (for example, transient immunologic suppression with rapid recovery, known allergy to first-line agents, concurrent medications that preclude prophylaxis, or short-term clinical decision documented by the provider). If a clinician documents a medical reason for not prescribing PCP prophylaxis despite the prior low CD4+ value, the episode is coded to reflect that prophylaxis was intentionally not prescribed for medical reasons. Typical sites of service include outpatient HIV specialty clinics, infectious disease clinics, community health centers, and primary care practices managing HIV-positive patients. A realistic scenario: a 32-year-old patient with newly diagnosed HIV had a CD4+ count of 180 cells/mm3 at diagnosis, started antiretroviral therapy, and at a follow-up visit six weeks later the CD4+ is 220 cells/mm3; the clinician documents that PCP prophylaxis was not prescribed because CD4+ recovered above threshold within three months.

Coding Specifications

Modifier	Description	When to Use
`25`	Significant, separately identifiable evaluation and management (E/M) service by the same physician on the same day of a procedure

Taxonomy Code	Specialty	Notes
`207RH0000X`	Infectious Disease	Specialists who commonly manage HIV and make prophylaxis decisions.
`207QG0300X`	HIV Medicine	Clinicians focused on comprehensive HIV care and management of opportunistic infection prophylaxis.
`208000000X`	Internal Medicine	Primary care physicians who manage HIV patients in outpatient settings.
`2084P0800X`	Family Medicine	Family physicians providing longitudinal HIV care and follow-up.
`363LF0000X`	Nurse Practitioner	Advanced practice clinicians who frequently manage HIV testing, treatment, and prophylaxis decisions.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`B20`	Human immunodeficiency virus [HIV] disease	Primary diagnosis under which CD4+ monitoring and PCP prophylaxis decisions occur.
`D84.9`	Immunodeficiency, unspecified	Captures immunodeficiency states relevant to opportunistic infection prophylaxis consideration.
`R79.89`	Other specified abnormal findings of blood chemistry	Used to report abnormal laboratory findings, such as low CD4+ count, during monitoring.
`Z79.899`	Other long term (current) drug therapy	May be used to indicate ongoing antiretroviral therapy which influences prophylaxis decisions.
`Z21`	Asymptomatic human immunodeficiency virus [HIV] infection status	Used for patients with HIV infection who are currently asymptomatic but require monitoring of CD4+ counts.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`99213`	Office or other outpatient visit for the evaluation and management of an established patient, typically 15 minutes	Commonly used for follow-up visits where CD4+ results are reviewed and the medical decision to withhold PCP prophylaxis is documented.
`99214`	Office or other outpatient visit for the evaluation and management of an established patient, typically 25 minutes	Used when the visit requires moderate complexity medical decision-making to document reasons for not prescribing prophylaxis.
`36415`	Collection of venous blood by venipuncture	Performed to obtain CD4+ count and related labs that inform prophylaxis decisions.
`87635`	Infectious agent detection by nucleic acid (e.g., HIV-1 RNA)	Used when HIV viral load testing is performed alongside CD4+ testing to assess immunologic recovery.
`86361`	Immunoassay for infectious agent antibody/antigen, qualitative	May be used for ancillary serologies ordered during HIV management visits that accompany prophylaxis decisions.

OpenPayer

Summary & Overview

HCPCS G9219: PCP Prophylaxis Not Prescribed for Medical Reason