ICD-10-CM 2027
ICD-10 code for oophoritis mumps
From the official ICD-10-CM alphabetic index entry “Mumps › oophoritis”. Page updated September 29, 2026.
About coding oophoritis mumps
The ICD-10-CM code for oophoritis mumps is B26.89 (Other mumps complications).
Within B26.8, choose B26.89 (Other mumps complications) only when documentation doesn't support a more specific option: mumps hepatitis (B26.81), mumps myocarditis (B26.82), mumps nephritis (B26.83), mumps polyneuropathy (B26.84) and mumps arthritis (B26.85).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 791 (Prematurity with Major Problems, relative weight 4.1075), DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), DRG 865 (Viral Illness with MCC, relative weight 1.3485) and DRG 866 (Viral Illness without MCC, relative weight 0.8692), in MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period) and MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about oophoritis mumps ICD-10 codes
What is the ICD-10 code for oophoritis mumps?
- B26.89 — Other mumps complications.
Is B26.89 billable?
- Yes. B26.89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B26.89 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B26.89 as a principal diagnosis.
Is B26.89 a CC or MCC?
- B26.89 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.