Description
Drug testing services are heavily scrutinized by Medicare, Medicaid, and commercial payers. Small mistakes in code selection, modifier use, documentation, or frequency limits can quickly lead to claim denials, audits, or even fraud investigations.
This Drug Testing Services Coding Cheat Sheet (Ed. 1) was created to help medical coders and revenue cycle professionals confidently navigate one of the most complex areas in laboratory billing.
Inside this guide you’ll learn:
- How to correctly code presumptive drug tests (80305–80307)
- When to use definitive testing codes (80320–80377 vs. G0480–G0483)
- How payers interpret drug class counts vs. substances tested
- The correct application of Modifiers 59, 91, 90, and QW
- Why many payers require G-codes instead of CPT codes
- The most common audit triggers and fraud red flags
- How to review claims like a payer auditor
- Documentation elements required to support medical necessity
- How to avoid frequency violations, CLIA errors, and panel billing denials
The guide also includes a step-by-step auditor review checklist and real-world denial examples so you can identify claim issues before submission.
If you code or review laboratory claims, this resource will help you submit cleaner claims, prevent denials, and protect your organization from costly audits.





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