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Lab billing for clinical, molecular and toxicology labs
Billing for independent and physician office labs: CLIA requirements, the Clinical Laboratory Fee Schedule, toxicology codes and more.
How laboratory billing works
Every lab claim needs a valid CLIA number that matches the tests performed, plus a complete ordering provider. Medicare pays most lab tests from the Clinical Laboratory Fee Schedule (CLFS), with rates updated under PAMA.
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Toxicology and molecular tests draw the most payer review, so medical necessity and the order itself must support every test billed.
Codes we bill every day
| Code | What it covers |
|---|---|
| 80305–80307 | Presumptive drug screening |
| G0480–G0483 | Definitive drug testing (Medicare), by number of drug classes |
| QW | CLIA-waived test modifier |
| 80053 / 85025 | Common panels and blood counts |
| Z-codes | Molecular test identifiers required by some MACs (MolDX) |
Code descriptions are summarized. Payer coverage and documentation rules vary by plan and state.
Denials we prevent
- Missing or mismatched CLIA certificate
- Ordering provider NPI missing or not enrolled
- Definitive drug testing without medical necessity
- Frequency limits on screening tests
- Molecular tests without required test registration
Payer rules to watch
Medicare requires the ordering or referring provider to be enrolled in Medicare. In MolDX regions, molecular tests also need a registered test identifier on the claim.
Questions about laboratory billing
Do you bill toxicology labs?
Yes, including presumptive and definitive drug testing with the documentation payers require.
Get a free laboratory billing audit
Send a few details and we will set up a short call to review your claims, denials and A/R. No cost and no commitment.
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