Description
Pathology coding requires more than matching CPT codes to procedures. Coders must also evaluate specimen complexity, interpretation method, modifier use, and laboratory compliance requirements.
Because these services often involve specialized testing and interpretation, payers closely review them for potential upcoding, unit misuse, or unsupported documentation.
This Pathology Coding Guide breaks down how experienced claim reviewers and auditors evaluate pathology claims.
In this guide you’ll learn how to:
✔ Match pathology specimens to the correct CPT level (88300–88309)
✔ Correctly report cytopathology interpretation and evaluation services
✔ Apply flow cytometry codes per specimen rather than per marker or cell type
✔ Use modifiers 59, 91, 26, TC, and 90 only when documentation supports them
✔ Understand reflex testing rules and when additional tests are justified
✔ Avoid common denial triggers related to slides, stains, and unit reporting
✔ Verify CLIA certification and POS requirements for high-complexity tests
✔ Review claims using an auditor-style verification checklist
Rather than memorizing isolated coding rules, this guide helps coders think like auditors and review pathology claims the way payers do.
The result: cleaner claims, fewer denials, and stronger documentation support.
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