Summary & Overview
CPT 81333: TGFBI Gene Detection, Technical Laboratory Test
CPT code 81333 identifies the technical laboratory procedure to detect common alterations in the transforming growth factor beta–induced gene (TGFBI), a molecular diagnostic test relevant to corneal dystrophies and related ocular conditions. Nationally, accurate coding for molecular diagnostic assays like 81333 matters because it affects claims processing, lab reporting, and coverage determinations for specialized genetic tests that can guide diagnosis and management.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The summary addresses reimbursement benchmarks, coding and billing considerations, payer coverage patterns, and clinical context for when TGFBI testing is used.
Readers will learn the clinical purpose of the test, typical site-of-service contexts, common billing modifiers used with laboratory technical components, and where to find policy and coverage guidance. The publication also highlights common payer behaviors and indexing used for molecular pathology services, and it identifies gaps where specific payer policy language or fee benchmarks are Data not available in the input.
Billing Code Overview
CPT code 81333 describes a technical laboratory test that detects common changes in the transforming growth factor beta–induced gene (TGFBI). The service involves laboratory analysis of patient samples to identify TGFBI gene alterations associated with corneal dystrophies and other ocular conditions.
-
Service Type: Molecular genetic diagnostic test (technical component)
-
Typical Site of Service: Clinical laboratory or hospital laboratory performing molecular diagnostic testing
Data not available in the input for associated taxonomies, ICD-10 diagnoses, or related codes.
Clinical & Coding Specifications
Clinical Context
A patient in their 30s–60s with progressive corneal opacities, recurrent corneal erosions, or a family history of corneal dystrophy is referred by an ophthalmologist for genetic testing. The practice obtains informed consent and collects a blood or buccal sample; the laboratory performs molecular analysis to detect common pathogenic variants in the transforming growth factor beta–induced gene (TGFBI) associated with corneal dystrophies (for example, granular, lattice, or Reis–Bücklers corneal dystrophies). Results are routed to the ordering ophthalmologist for diagnostic confirmation, prognosis, genetic counseling, and surgical planning (such as phototherapeutic keratectomy or corneal transplantation) when applicable. Typical workflow steps include specimen accessioning, DNA extraction, targeted variant analysis or sequencing, analytic interpretation by a molecular technologist, and reporting with clinical correlation by a board‑certified molecular pathologist or laboratory director.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the professional interpretive component separate from the technical lab processing (if allowed). |
TC | Technical component | Use when billing only the technical component for the laboratory performing the assay. |
90 | Reference (outside) laboratory | Use when testing is performed by an outside reference laboratory and the billing provider is reporting the outside lab service. |
91 | Repeat clinical diagnostic test (Note: not in provided list) | Data not available in the input. |
90 | Reference (outside) laboratory | Duplicate entry prevented: already listed above. |
59 | Distinct procedural service (Note: not in provided list) | Data not available in the input. |
52 | Reduced services | Use when the service provided is partially reduced or when a limited panel was performed. |
53 | Discontinued procedure | Use if testing was started but discontinued for patient safety or specimen failure. |
22 | Increased procedural services | Use when analysis required substantially greater resources or time than typical (rare for standardized assays). |
24 | Unrelated E/M service (Note: not in provided list) | Data not available in the input. |
80 | Assistant surgeon (Note: not applicable) | Use: not typically applicable to laboratory testing. |
90 | Duplicate prevented: already present — only list unique modifiers. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| Data not available in the input. | Data not available in the input. | Data not available in the input. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
H18.4 | Corneal dystrophy | Primary indication for 81333 testing to identify TGFBI pathogenic variants associated with corneal dystrophies. |
H18.8 | Other corneal disorders | Used when a specific corneal disorder is not otherwise specified but genetic testing is considered. |
H18.9 | Unspecified corneal disorder | Used when documentation lacks a more specific corneal diagnosis but testing is clinically indicated. |
H17.8 | Other corneal scars and opacities | Relevant when recurrent scarring prompts genetic evaluation for hereditary dystrophy. |
Z13.79 | Encounter for screening for other disorder | May be used when asymptomatic individuals with family history undergo predictive testing. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
0000U | Proprietary molecular test — specific EUA or lab-developed test code (example) | Possible companion molecular assay codes used in advanced genomics labs; used when reporting unique molecular tests in lab systems. |
81479 | Unlisted molecular pathology procedure | Used when a specific analyte or methodology does not have an assigned CPT code and an unlisted molecular pathology code must be reported. |
88360 | Morphometric analysis (e.g., corneal histopathology) | May be billed by pathology when corneal tissue is examined in cases proceeding to transplantation. |
82542 | Therapeutic drug assay (example) | Not directly related but represents common laboratory billing when drug monitoring and genetic testing are ordered together. |
0000U | Duplicate entry prevented: proprietary test example |