B26.85 Mumps arthritis

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from B26 Mumps

Includes

• epidemic parotitis
• infectious parotitis

Risk adjustment (HCC)

• CMS-HCC V28: HCC 92 — Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis
• CMS-HCC V22: HCC 39 — Bone/Joint/Muscle Infections/Necrosis
• ESRD V24: HCC 39

MS-DRG index

Defines the logic of DRG(s) 791 in MDC 15.

Approximate ICD-9-CM (GEMs)

• 072.79 Other mumps with other specified complications (approximate)

Code annotations containing back-references to B26.85

Back-references to B26.85

• Type 1 Excludes: M01 Direct infections of joint in infectious and parasitic diseases classified elsewhere ("mumps arthritis (B26.85)")
• Type 1 Excludes: M02 Postinfective and reactive arthropathies ("mumps arthritis (B26.85)")

Back-references to B26

• Code First: H67 Otitis media in diseases classified elsewhere ("viral disease NEC (B00-B34)")
• Type 1 Excludes: K11.2 Sialoadenitis ("epidemic parotitis (B26.-)")
• Type 1 Excludes: K11.2 Sialoadenitis ("mumps (B26.-)")

Diagnosis Index entries for B26.85

• Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) › in (due to) › mumps
• Mumps › arthritis

Nearby codes

• B26.8 Mumps with other complications
• B26.81 Mumps hepatitis
• B26.82 Mumps myocarditis
• B26.83 Mumps nephritis
• B26.84 Mumps polyneuropathy
• B26.85 Mumps arthritis (this code)
• B26.89 Other mumps complications
• B26.9 Mumps without complication