Medicare Code Edits (MCE)

The Medicare Code Editor is the software CMS uses to test every inpatient hospital claim before payment. It checks each reported ICD-10-CM diagnosis code and ICD-10-PCS procedure code against a set of edits covering age consistency, coding sequence, and Medicare coverage. A claim that fails an edit is returned to the hospital for correction.

The FY 2026 manual (v43.0) defines 18 active edits with published code lists: 9 for ICD-10-CM diagnosis codes covering 10,159 codes, and 9 for ICD-10-PCS procedure codes covering 258 codes. Several older edits, including the sex conflict checks, have been deactivated.

The claim is flagged before payment. Depending on the edit, the hospital corrects the diagnosis or procedure code, fixes the patient data, or resubmits with proper sequencing. Coverage edits work differently: the procedure is simply denied or paid in part, since the code itself is correct.

Diagnosis edits test whether an ICD-10-CM code fits the patient and its position on the claim, for example age ranges or codes that cannot be the principal diagnosis. Procedure edits are mostly about coverage: ICD-10-PCS codes Medicare never pays, pays in part, or pays only under specific diagnosis conditions.

The sex conflict edit (diagnoses and procedures for one sex only) was deactivated as of October 1, 2024, and the multiple myeloma transfusion edit was discontinued in 2018. Their pages remain for reference, but the checks are no longer part of Medicare claims processing.