CPT 81380 HLA High-Resolution: Reimbursement

CPT code 81380 represents a high-resolution molecular assay for human leukocyte antigen (HLA) genes focused on a single Class I locus. This test is clinically important for organ and stem cell transplantation compatibility, donor matching, and detailed immunogenetic assessment. Accurate HLA typing at high resolution can influence transplant outcomes and patient selection for immunologically sensitive therapies, making it a nationally relevant laboratory service.

Key payers covered in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical purpose and laboratory setting for CPT code 81380, along with coverage and billing considerations relevant to major national payers. The publication summarizes common modifiers and administrative elements associated with laboratory molecular testing, highlights typical sites of service, and outlines what types of benchmarks and policy updates to expect in related payer guidance. Where specific input data is unavailable, the report notes that those items are not provided.

The content is organized to help billing managers, laboratory directors, and policy analysts understand service definition, payer relevance, and the administrative context for high-resolution HLA Class I molecular testing under CPT code 81380. Data not available in the input are identified as such.

Billing Code Overview

CPT code 81380 describes a high-resolution molecular test for human leukocyte antigen (HLA) genes, performed for one Class I locus. The procedure involves laboratory molecular techniques to determine HLA variants at high resolution for clinical purposes such as transplant compatibility and immunogenetic evaluation.

Service type: Clinical molecular laboratory testing (HLA typing, high-resolution)

Typical site of service: Clinical laboratory or hospital-based molecular diagnostics laboratory

Clinical Context

A 32-year-old patient undergoing evaluation as a potential organ (kidney) or marrow transplant donor/recipient is referred for high-resolution human leukocyte antigen (HLA) typing of a single Class I locus. The specimen (blood or buccal swab) is collected in the outpatient phlebotomy lab or transplant clinic and routed to the molecular diagnostic laboratory. A clinical laboratory scientist performs a molecular assay (e.g., sequence-based typing or next-generation sequencing) to determine high-resolution alleles for the specified Class I locus (HLA-A, HLA-B, or HLA-C). Results are reviewed by the laboratory director and reported to the transplant team or ordering provider to inform donor-recipient matching, immunogenetic risk assessment, or immune compatibility decisions. Typical sites of service include hospital outpatient laboratory, independent clinical laboratory, or specialized transplant center laboratory.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the professional (interpretive) component of a divided lab service if applicable to the reporting laboratory.
`TC`	Technical component	Use when billing only the technical component (assay performance) of the test performed by the laboratory.

Taxonomy Code	Specialty	Notes
207RG0100X	Clinical Molecular Genetics Laboratory	Laboratory specialists performing molecular HLA testing.
207RA0000X	Pathology	Anatomic and clinical pathologists who direct molecular diagnostic services.
208D00000X	Clinical Laboratory	Clinical laboratory directors and medical technologists overseeing testing.
207L00000X	Infectious Disease (Laboratory Molecular)	Specialists involved when HLA testing is part of transplant infectious disease workup.
2084P0800X	Transplant Surgeon	Ordering clinicians in transplant programs coordinating HLA testing.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Z48.21`	Encounter for aftercare following organ transplant	Used for post-transplant compatibility monitoring and follow-up HLA testing.
`Z48.22`	Encounter for aftercare following bone marrow transplant	Relevant for donor-recipient matching and post-transplant chimerism assessments.
`Z52.4`	Donor of organ	Used when testing a living organ donor for HLA compatibility.
`Z52.0`	Bone marrow donor	Used for HLA typing of potential hematopoietic stem cell donors.
`Z31.84`	Encounter for genetic counseling related to reproductive carrier screening	Applicable when HLA results are part of broader genetic counseling in transplant planning.
`D47.Z9`	Hematologic neoplasm, unspecified	Used when HLA typing is required as part of transplantation planning for hematologic malignancies.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`81381`	HLA typing, high resolution; each additional Class I locus (e.g., second locus)	Performed when more than one Class I locus requires high-resolution typing in a donor/recipient pair; billed in addition to the primary locus code.
`81383`	HLA typing, high resolution; Class II locus (e.g., HLA-DRB1)	Used when Class II high-resolution typing is required alongside Class I typing for comprehensive matching.
`81225`	HLA-B*57:01 allele testing via molecular technique	Performed when allele-specific testing for drug hypersensitivity is needed in addition to broad HLA typing.
`86399`	Unlisted immunology procedure	Rarely used if an atypical or novel HLA-related assay lacks an established code; used with caution and documentation.
`99000`	Technical courier/transportation for specimen	Applied when special courier services are required to transport specimens to reference laboratories for HLA testing.

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Summary & Overview

CPT 81380: High-Resolution HLA Class I Molecular Typing