Genetic testing claims fail for reasons most lab billing never runs into. A single test can map to a gene-specific code, a panel code, a proprietary PLA code, or an unlisted code, and the payer may not pay any of them unless the test is registered, authorized in advance, and ordered for a reason the payer covers. Medicare adds a separate registry for molecular tests in most of the country, and commercial plans often hand genetic testing to lab benefit managers with their own clinical criteria.
The lab also has to be set up to bill at all. That means a CLIA certificate, state licenses in the states where patients live, and enrollment as a lab with each payer.
Key Takeaways
- Molecular tests bill under gene-specific Tier 1 codes, Tier 2 codes, genomic sequencing panel codes, PLA codes, or 81479 for unlisted tests.
- Medicare contractors in the MolDX program require each molecular test to be registered and its identifier reported on the claim.
- Medicare generally doesn’t cover genetic testing to screen people without symptoms or a personal history of the condition.
- Many commercial plans require prior authorization through a lab benefit manager before the specimen is run.
- Labs need a CLIA certificate and, in several states, a separate state license to accept specimens from patients there.
How are genetic tests coded?
Molecular pathology coding sorts tests by how specific the code is.
- Tier 1 codes (81105 to 81383, and others in the 81xxx range) name a specific gene and analysis, such as BRCA1 and BRCA2 full sequencing.
- Tier 2 codes (81400 to 81408) group less common gene analyses into levels based on the technical work involved.
- Genomic sequencing procedure codes (81410 to 81471) cover multigene panels, exome sequencing, and genome sequencing.
- Multianalyte assays with algorithmic analyses (MAAA codes in the 815xx range) combine several results into a score.
- Proprietary Laboratory Analyses codes (the U-codes, 0001U and up) identify a single lab’s branded test.
- 81479 is the unlisted molecular pathology code for tests with no specific code.
When a specific code exists, the lab has to use it. Billing 81479 for a test that has a Tier 1 or PLA code is a common cause of denials. Billing several Tier 1 codes for genes that are all part of one panel can be treated as unbundling. Our guide to which CPT codes are used in genetic testing billing lists the most common codes by test type.
How do Medicare and MolDX decide which tests get paid?
Most Medicare Administrative Contractors handle molecular diagnostics through the MolDX program. In MolDX jurisdictions, each test has to be registered in the DEX Diagnostics Exchange and assigned a Z-code identifier, and that identifier goes on every claim for the test. A claim without it, or with one that doesn’t match the billed code, denies. MolDX also issues technical assessments and coverage articles that decide which tests Medicare will pay for at all.
Medicare covers diagnostic genetic testing when the results will be used to manage the patient’s care. It generally doesn’t cover screening tests for people without symptoms or a personal history of the condition, which rules out many hereditary risk panels for patients who are only curious about their risk. When a test may not be covered, the lab should have the patient sign an Advance Beneficiary Notice before the specimen is run and bill with the GA modifier. Without a valid ABN, the lab can’t bill the patient for a denied test.
Date of service is a frequent trap. For specimens collected during a hospital stay, Medicare’s rules decide whether the hospital or the lab bills the test, depending on when the test was ordered relative to discharge. Molecular pathology tests performed on hospital outpatient specimens can usually be billed by the lab directly. Getting this wrong sends the claim to the wrong payer entirely.
When do genetic tests need prior authorization?
Many commercial plans and Medicaid managed care plans send genetic testing requests to a lab benefit manager, which applies its own clinical criteria. A request usually needs the ordering provider’s notes, family history, the specific test and codes, and a statement of how the result will change treatment. Requests for broad panels are often denied when a narrower test would answer the clinical question.
The authorization has to match the claim. If the approval lists one CPT code and the lab bills a different one or adds codes, the claim can deny even though the test was approved. We cover this in why an approved authorization can still end in a denied claim. Our guide to genetic testing coverage and reimbursement goes deeper on payer policy.
What does a genetic testing lab need to get credentialed?
CLIA and state licensure
Every lab performing clinical testing needs a certificate under the Clinical Laboratory Improvement Amendments. High-complexity molecular testing generally requires a Certificate of Compliance or a Certificate of Accreditation through a body such as the College of American Pathologists. Several states, including New York, California, and Pennsylvania, also require out-of-state labs to hold a state license before accepting specimens from residents. Payers check both.
Payer enrollment
Independent labs enroll with Medicare as a facility using the CMS-855B, not as an individual provider. The lab bills the Medicare contractor for the state where the testing is performed, so a lab that tests specimens from across the country still bills one MAC. Medicaid and commercial plans each contract with the lab separately, and many genetic testing claims go out of network until those contracts are in place. Our credentialing team handles CLIA documentation, state licenses, and lab enrollment together.
Genetic Testing Billing FAQs
What is a PLA code?
A Proprietary Laboratory Analyses code identifies one lab’s specific branded test. PLA codes end in U, and when a test has one, the lab should bill it instead of a general molecular code or 81479.
What is MolDX?
MolDX is the program several Medicare contractors use to register molecular tests, set coverage, and price them. In MolDX jurisdictions, each test needs a registered Z-code identifier on the claim.
Does Medicare cover genetic testing for hereditary cancer risk?
Only in specific circumstances, such as for patients with a personal history of certain cancers who meet coverage criteria. Medicare generally doesn’t cover screening tests for people with no symptoms or personal history.
When should a lab use 81479?
Only when no Tier 1, Tier 2, panel, or PLA code describes the test. Payers review 81479 claims closely and usually require documentation describing what was tested.
Does a genetic testing lab need a state license?
Some states do require one. New York, California, and Pennsylvania, among others, require out-of-state labs to be licensed before testing specimens from their residents, in addition to holding a CLIA certificate.
Who bills the test when the specimen was collected in a hospital?
It depends on the patient’s status and timing. For hospital outpatients, the lab can usually bill molecular pathology tests directly. For inpatients and some other cases, the test may be part of the hospital’s payment.
Why do genetic testing labs choose Medwave?
Medwave handles genetic testing billing, lab credentialing, and payer contracting under one team. We match each test to its most specific code, keep MolDX identifiers on every Medicare claim, obtain prior authorizations before specimens are run, and appeal denials with the clinical documentation payers ask for. That’s how we hold a 98% clean claim rate.
With credentialing, we manage CLIA documentation, out-of-state lab licenses, and enrollment with Medicare, Medicaid, and commercial plans, with a 60-day average turnaround.
Contact Medwave below to see how we can support your genetic testing lab.