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Pathology/Lab Coding Alert

Path/Lab Coding:

Don’t Let Mistakes Muddle You Modifier 90 or 91 Claims

Published on Thu Feb 27, 2025

Here’s how to avoid duplicate billing. Clinical labs frequently reach for modifiers 90 (Reference (outside) laboratory) and 91 (Repeat clinical diagnostic laboratory test) to support claims coverage. But each modifier comes with its own pitfalls that could prevent proper pay.   Check out these tips to make sure your lab’s “repeat test” or “reference lab” bills are clean.   Navigate Repeat Services [...]
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