HCPCS G0433: HIV-1/HIV-2 Antibody Screening by ELISA

HCPCS Level II code G0433 represents an ELISA-based screening test for antibodies to HIV-1 and/or HIV-2. This laboratory screening code is nationally relevant as HIV screening remains a public health priority for early detection and linkage to care. Use of G0433 supports standardized reporting and billing for HIV antibody screening performed with enzyme-linked immunosorbent assay techniques.

Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise review of coverage and billing context for G0433, clinical implications of ELISA-based HIV screening, and operational considerations for laboratories and outpatient sites. The publication covers typical sites of service, how the code maps to laboratory workflows, common modifiers used in practice (listed separately), and benchmarking elements where available.

The report summarizes national policy and payer considerations relevant to HIV screening with ELISA, explains how G0433 is used in clinical workflows, and outlines topics for revenue cycle teams and clinical managers to monitor, including documentation, specimen handling, and claims submission practices. Data not available in the input is noted where applicable.

Billing Code Overview

HCPCS Level II code G0433 describes infectious agent antibody detection by enzyme-linked immunosorbent assay (ELISA) technique for HIV-1 and/or HIV-2, screening. The service type is a laboratory screening test for HIV antibodies using ELISA methodology. The typical site of service is laboratory settings, hospital outpatient laboratories, community clinics, and other clinical sites that collect specimens for laboratory analysis.

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Clinical Context

A 28-year-old sexually active patient presents to an outpatient primary care clinic requesting routine screening for HIV infection as part of annual preventive care. The clinician documents patient consent and orders an HIV screening test using an enzyme-linked immunosorbent assay (ELISA) capable of detecting antibodies to HIV-1 and HIV-2. A licensed laboratory phlebotomist draws venous blood, labels the specimen, and transports it to the clinical laboratory. The laboratory performs the screening antibody ELISA assay (G0433). If the ELISA is reactive, reflex confirmatory testing per local protocol (e.g., HIV-1/HIV-2 differentiation immunoassay or HIV RNA testing) is initiated and results are reported to the ordering clinician. Typical workflow includes specimen collection at the clinic (POS: outpatient office) or at a standalone laboratory/phlebotomy site, laboratory processing in a certified clinical laboratory, and result reporting to clinician and patient. Documentation includes reason for test, informed consent for HIV testing if required by state law, specimen source, test performed (G0433), and interpretation of results.

Coding Specifications

Modifier	Description	When to Use
`00`	Service furnished without a bilateral procedure indicator	Use when no bilateral modifier is applicable; rarely used for laboratory tests but listed as a default modifier option.

Taxonomy Code	Specialty	Notes
`207Q00000X`	Family Medicine	Common ordering provider for routine HIV screening in ambulatory care.
`208D00000X`	General Internal Medicine	Frequently orders HIV screening during preventive visits and primary care encounters.
`208000000X`	Pathology/Laboratory Medicine	Oversees laboratory testing, quality, and result interpretation for `G0433`.
`363L00000X`	Phlebotomy Technician	Performs specimen collection for laboratory testing.
`207P00000X`	Obstetrics & Gynecology	Orders HIV screening for prenatal and reproductive health care visits.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Z11.4`	Encounter for screening for human immunodeficiency virus [HIV]	Standard code for asymptomatic patients receiving routine HIV antibody screening such as `G0433`.
`Z20.6`	Contact with and (suspected) exposure to human immunodeficiency virus [HIV]	Used when patient has known exposure and requires HIV screening and follow-up.
`O98.7`	Maternal infectious and parasitic diseases classifiable elsewhere complicating pregnancy, childbirth and the puerperium (HIV)	Used for HIV screening in prenatal care contexts.
`R75`	Inconclusive laboratory evidence of human immunodeficiency virus [HIV]	Applied when initial screening is reactive but confirmatory testing is pending or indeterminate.
`B20`	Human immunodeficiency virus [HIV] disease	Relevant when screening is part of care for a patient with known HIV infection (e.g., monitoring or additional testing).

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`36415`	Collection of venous blood by venipuncture	Performed immediately before `G0433` when blood specimen is required for the ELISA screening.
`86701`	Antibody; HIV-1, screening (enzyme immunoassay [EIA] or enzyme-linked immunosorbent assay [ELISA])	A CPT laboratory code that is clinically equivalent to `G0433` in some billing contexts; used by laboratories and payers that accept CPT coding for HIV screening.
`87389`	Infectious agent antigen detection by enzyme immunoassay, multiple-step method (e.g., HIV antigen/antibody combo)	Performed in workflows that include antigen/antibody combination testing; may be ordered alongside or instead of `G0433` depending on clinical protocol.
`87535`	Infectious agent detection by nucleic acid (e.g., HIV-1 RNA), amplified probe technique	Used for confirmatory testing or viral load quantification if `G0433` is reactive and further molecular testing is indicated.
`86703`	Antibody; HIV-2, confirmatory or supplemental test	Used when differentiation between HIV-1 and HIV-2 antibodies is required after an initial reactive `G0433` screen.

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Summary & Overview