ICD-10 Code B25.1 – Cytomegaloviral Hepatitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B25.1 – Cytomegaloviral hepatitis
What it is
B25.1 identifies hepatitis caused by cytomegalovirus (CMV), a viral infection that affects the liver. Use it when documentation states CMV hepatitis or cytomegaloviral hepatitis.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records may describe liver inflammation with systemic CMV infection, such as malaise, fever, or abnormal liver findings.
When to use this code
Use B25.1 when the provider documents hepatitis due to CMV, including confirmed CMV involvement of the liver. It may also apply when CMV hepatitis is listed as the principal or secondary diagnosis. Code the documented condition, not just CMV infection alone.
Do not use for
Do not use this code for nonspecific hepatitis without CMV documentation. Check documentation if the record only mentions CMV infection, congenital CMV, or another organ-specific CMV disease.
Coding tip
Look for explicit provider linkage between CMV and hepatitis before assigning B25.1.