B25.0 Cytomegaloviral pneumonitis

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

Applies from B25 Cytomegaloviral disease

Excludes1 (never code together)

• congenital cytomegalovirus infection (P35.1)
• cytomegaloviral mononucleosis (B27.1-)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 6 — Opportunistic Infections
• CMS-HCC V22: HCC 6 — Opportunistic Infections
• RxHCC V08: HCC 5 — Opportunistic Infections
• ESRD V24: HCC 6

MS-DRG index

Defines the logic of DRG(s) 177-179 in MDC 04.

Approximate ICD-9-CM (GEMs)

• 078.5 Cytomegaloviral disease (approximate)
• 484.1 Pneumonia in cytomegalic inclusion disease (approximate)

Code annotations containing back-references to B25.0

Back-references to B25.0

• Type 1 Excludes: J17 Pneumonia in diseases classified elsewhere ("pneumonia in cytomegalovirus disease (B25.0)")

Back-references to B25

• Type 2 Excludes: B10 Other human herpesviruses ("human herpesvirus 5 (B25.-)")
• Code First: H67 Otitis media in diseases classified elsewhere ("viral disease NEC (B00-B34)")
• Use Additional: T86.43 Liver transplant infection ("Cytomegalovirus (CMV) infection (B25.-)")

Diagnosis Index entries for B25.0

• Disease, diseased › cytomegalic inclusion (generalized) › with pneumonia
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › cytomegalic inclusion
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › cytomegaloviral
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › in (due to) › cytomegalovirus disease

Nearby codes

• B25 Cytomegaloviral disease
• B25.0 Cytomegaloviral pneumonitis (this code)
• B25.1 Cytomegaloviral hepatitis
• B25.2 Cytomegaloviral pancreatitis
• B25.8 Other cytomegaloviral diseases
• B25.9 Cytomegaloviral disease, unspecified