ICD-10-CM 2027
ICD-10 code for cytomegalic inclusion pneumonia
From the official ICD-10-CM alphabetic index entry “Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › cytomegalic inclusion”. Page updated September 29, 2026.
About coding cytomegalic inclusion pneumonia
The ICD-10-CM code for cytomegalic inclusion pneumonia is B25.0 (Cytomegaloviral pneumonitis).
Within B25 (cytomegaloviral disease), B25.0 is specifically for cytomegaloviral pneumonitis. Related codes cover cytomegaloviral hepatitis (B25.1), cytomegaloviral pancreatitis (B25.2), other cytomegaloviral diseases (B25.8) and unspecified (B25.9).
As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" 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 177 (Respiratory Infections and Inflammations with MCC, relative weight 1.6092), DRG 178 (Respiratory Infections and Inflammations with CC, relative weight 0.9744) and DRG 179 (Respiratory Infections and Inflammations without CC/MCC, relative weight 0.7345), in MDC 04 (Diseases and Disorders of the Respiratory System), 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 cytomegalic inclusion pneumonia ICD-10 codes
What is the ICD-10 code for cytomegalic inclusion pneumonia?
- B25.0 — Cytomegaloviral pneumonitis.
Is B25.0 billable?
- Yes. B25.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B25.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B25.0 as a principal diagnosis.
Is B25.0 a CC or MCC?
- B25.0 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.