MUE (Medically Unlikely Edits)
Medically Unlikely Edits
CMS-set maximum units of service that a provider would report under most circumstances for a single beneficiary on a single date of service.
1 min read · Last reviewed May 23, 2026
At a glance
- Category
- Billing
- Acronym for
- Medically Unlikely Edits
- Primary sources
- 2
- Workspace handoff
- denial workbench →
Where this comes up
This shows up in revenue-cycle work — claim scrubbing, charge entry, posting, A/R follow-up, and month-end close. Billers and practice managers hit this term when reconciling a payment, working a denial queue, or auditing why a claim aged past 60 days.
Full definition
What it is in practice
MUE values are published in the NCCI MUE tables. They differ from NCCI PTP edits and from absolute limits — an MUE can be appealed with documentation when the unit count is clinically appropriate.
How it shows up in your practice
Run MUE checks in the practice management system. When billing above MUE is justified, file an appeal with documentation of the medical necessity.
Sources
- CMS — Medically Unlikely Edits (MUE)https://www.cms.gov/medicare/coding-billing/national-correct-coding-initiative-ncci-edits/medicare-ncci-medically-unlikely-edits
- CMS — National Correct Coding Initiativehttps://www.cms.gov/medicare/coding-billing/national-correct-coding-initiative-ncci-edits
Appeal MUE denials in the Denial Workbench
Open denial workbench →Related terms
- BillingNCCI EditsThe CMS National Correct Coding Initiative edits that prevent improper payment when incorrect code combinations are reported.
- CodingMedical NecessityThe standard requiring that services be reasonable and necessary for the diagnosis or treatment of illness or injury or to improve the functioning of a malformed body member.
- Denials & AppealsDenial ManagementThe end-to-end workflow of identifying, categorizing, appealing, and preventing claim denials.
D3rx is a healthcare-billing and compliance research aid maintained by D3rx Inc. Articles are drafted by an LLM (Anthropic Claude) against primary HHS, OCR, CMS, eCFR, NIST, and state-regulator publications, and reviewed for restraint and source fidelity by the D3rx team.
Reviewer status: a named credentialed reviewer (CHC, CHPC, or healthcare attorney) is being engaged. Until that engagement is finalized, this page does not claim credentialed review.
Related across the archive
- GlossaryNCCI EditsThe CMS National Correct Coding Initiative edits that prevent improper payment when incorrect code combinations are reported.
- GlossaryDenial ManagementThe end-to-end workflow of identifying, categorizing, appealing, and preventing claim denials.
- GlossaryMedical NecessityThe standard requiring that services be reasonable and necessary for the diagnosis or treatment of illness or injury or to improve the functioning of a malformed body member.
- RegulationNCCI Medically Unlikely Edits (MUEs)MUEs are maximum units of service that a single provider would reasonably report on a single date for a single beneficiary, with three adjudication levels (line, date, claim).
- GlossaryModifier 59CPT modifier identifying a distinct procedural service that is not normally reported together but is appropriate under the circumstances.
- GlossaryPulmonary Function Testing (94010-94799)CPT codes for spirometry, lung volumes, diffusion capacity, and other pulmonary function tests.
- GlossaryCO-97 (Service Included in Another Service)Contractual Obligation 97 — the benefit for this service is included in the payment for another service.
- BillingAWV + Problem Visit Same Day: How to Bill CorrectlyYes, you can bill AWV and a problem visit the same day. Here's how to do it correctly with modifier -25.
This glossary entry is a research aid for billing and compliance staff. It does not provide legal, medical, or financial advice and does not replace counsel. References cited link to primary sources at HHS, OCR, CMS, eCFR, NIST, and the relevant payer or industry body.