81255 HEXA Test CPT Reimbursement & Policy

CPT code 81255 represents the technical laboratory test to detect common variants in the HEXA (hexosaminidase A alpha polypeptide) gene. This molecular diagnostic service supports identification of pathogenic changes underlying disorders such as Tay–Sachs disease and plays a role in carrier screening, diagnostic evaluation, and family counseling. Nationally, access to standardized genetic testing and consistent billing for laboratory technical services affects clinical workflows, laboratory reimbursement, and patient access to genetic information.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for HEXA testing, typical sites of service where the technical component is performed, and what to expect in payer coverage patterns. The publication also summarizes common modifiers used for laboratory technical components and highlights where input data are not available.

This summary prepares laboratory administrators, billing staff, and policy analysts to understand the code’s clinical purpose, the payer landscape nationally, and what types of benchmarks and policy updates would be relevant for genetic testing services. Data not available in the input are noted where applicable.

Billing Code Overview

CPT code 81255 describes a laboratory test in which a lab analyst performs the technical component of a molecular diagnostic assay to detect common changes in the HEXA gene (hexosaminidase A [alpha polypeptide]). This service is a genetic/molecular diagnostic test that targets pathogenic variants associated with conditions such as Tay–Sachs disease.

Service Type: Molecular diagnostic testing / Genetic analysis

Typical Site of Service: Clinical laboratory or reference molecular diagnostics laboratory

Data not available in the input.

Clinical Context

A 6-month-old infant is referred to a genetics laboratory after newborn screening and/or family history suggests risk for Tay–Sachs disease. The infant presents with delayed developmental milestones and an abnormal newborn screen indicating possible hexosaminidase A deficiency. A blood sample (typically EDTA whole blood) is sent to a molecular diagnostics laboratory where a lab analyst performs 81255 testing to detect common pathogenic variants in the HEXA gene (hexosaminidase A [alpha polypeptide]). The clinical workflow includes specimen collection, accessioning, DNA extraction, targeted variant analysis or single-gene sequencing for common HEXA variants, result interpretation by a molecular pathologist, and reporting to the ordering geneticist or pediatrician. Results inform diagnostic confirmation, carrier testing for parents, genetic counseling, and reproductive planning.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when reporting only the professional (interpretation) component of testing if separated from the technical component.
`TC`	Technical component

Taxonomy Code	Specialty	Notes
207Q00000X	Clinical Molecular Genetics	Laboratory medical directors and molecular geneticists who oversee HEXA testing.
2086S0102X	Clinical Laboratory Geneticist	Specialists interpreting molecular diagnostic results.
207K00000X	Clinical Genetics	Medical geneticists ordering and using results for patient management.
261QM0800X	Pediatrician	Pediatricians who identify newborn screening abnormalities and coordinate testing.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`E75.0`	Gangliosidosis and other lipidosis, Tay–Sachs disease	Primary diagnosis associated with HEXA pathogenic variants and indication for `81255` testing.
`Z13.71`	Encounter for screening for metabolic disorder of newborn	Newborn screening follow-up leading to diagnostic HEXA testing.
`R62.0`	Delayed milestones in childhood	Clinical presentation prompting genetic evaluation including HEXA testing.
`Z15.01`	Genetic susceptibility to metabolic disorder	Family history or carrier status prompting targeted HEXA variant analysis.
`Z14.8`	Genetic carrier status for other specified conditions	Parental carrier testing and counseling related to HEXA variants.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`81255`	Analysis to detect common changes in the HEXA gene (hexosaminidase A)	Primary molecular test used to detect pathogenic variants associated with Tay–Sachs disease.
`81338`	Sanger sequencing; gene-targeted sequencing (small gene)	May be performed to confirm variants detected by targeted testing or to sequence HEXA coding regions not covered by `81255`.
`81479`	Unlisted molecular pathology procedure	Used when a specific variant analysis or more extensive testing for HEXA does not map to an existing CPT and additional reporting is required.
`0000F`	Data not in provided list	Data not available in the input.
`81253`	Analysis of other common mutations in a related gene	Used when broader panel testing includes genes related to lysosomal storage disorders.

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Summary & Overview

CPT 81255: HEXA (Hexosaminidase A) Genetic Test, Technical Component