What is an MUE?
A Medically Unlikely Edit is the most units of a service a provider would normally report for one patient on one day. Units above it are denied.
MUE adjudication indicators
| MAI | Applies to | What it means for the claim |
|---|---|---|
| 1 | Each claim line | Units above the limit on a line are denied. Correctly split lines with modifiers can be paid. |
| 2 | The date of service, by policy | An absolute limit from regulation or policy. Appeals rarely succeed. |
| 3 | The date of service, clinically | A limit based on clinical practice. Records showing medical necessity can win on appeal. |
- Example: a code with an MUE of 2 and MAI 3, billed for 3 units on one day. One unit is denied; the appeal needs records showing why three were needed.
MUEs are part of NCCI. Each one sets the highest number of units a provider would report for a service, for one patient, on one date of service, under most circumstances.
The adjudication indicator
Every MUE has an MUE Adjudication Indicator (MAI) that decides how it’s applied: per claim line (1), per day as an absolute policy limit (2), or per day as a clinical limit that can be appealed (3).
How to handle them
Check units before billing. When a patient truly needed more, document why. For MAI 1, splitting the units across lines with the right modifiers is valid only when the services were distinct. For MAI 3, an appeal with records can work. For MAI 2, the limit stands.
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