Summary & Overview
CPT 81372: HLA Class I Low/Intermediate-Resolution Molecular Typing
CPT code 81372 denotes a laboratory-based molecular test for low- or intermediate-resolution typing of human leukocyte antigen (HLA) Class I loci — specifically HLA–A, HLA–B, and HLA–C. This code matters nationally because HLA Class I typing is central to organ and stem cell transplant compatibility assessment, donor matching, and certain immunogenetic evaluations that affect patient safety and transplant outcomes. Accurate coding supports appropriate lab workflows, payer adjudication, and clinical decision-making.
Key payers analyzed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical intent and service setting for the code, a summary of common billing modifiers used with molecular laboratory services, and indicators of where CPT code 81372 fits among related HLA and molecular testing services. The publication outlines typical sites of service and operational considerations relevant to laboratories and billing teams.
This briefing is designed to inform laboratory administrators, coding and billing professionals, and clinicians about the clinical context and administrative handling of CPT code 81372, provide benchmarking context where available, and highlight policy and coding considerations affecting national reimbursement practices. Data not available in the input will be noted where applicable.
Billing Code Overview
CPT code 81372 describes a laboratory service performing low- or intermediate-resolution molecular assessment of human leukocyte antigen (HLA) genes for all Class I loci. The test includes analysis of Class I loci HLA–A, HLA–B, and HLA–C using molecular techniques.
Service Type: Laboratory — Molecular HLA Typing (Class I, low/intermediate resolution)
Typical Site of Service: Clinical laboratory or hospital laboratory setting, where technical laboratory analysis of patient specimens is performed.
Clinical & Coding Specifications
Clinical Context
A 35-year-old patient evaluated for organ transplantation is referred for HLA typing to assess compatibility with a potential donor. The ordering transplant physician (e.g., transplant surgeon or nephrologist) collects a peripheral blood specimen during a pre-transplant clinic visit or inpatient admission. The specimen is sent to a molecular diagnostics laboratory where a molecular technologist performs low- or intermediate-resolution typing of HLA Class I loci (HLA–A, –B, –C) using PCR-based molecular techniques. Results are reported to the transplant team and transplant immunology coordinator to inform donor selection, crossmatch planning, and immunogenetic risk assessment. Typical workflow steps: specimen collection and accessioning, DNA extraction, amplification and detection for HLA–A/B/C loci, result validation by a qualified laboratory director, and report delivery to the ordering provider and transplant program. Typical site of service: outpatient transplant clinic, hospital inpatient setting, or reference molecular pathology laboratory.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the physician or laboratory director interpretation/overread of the test result separate from the technical component |
TC |