ICD-10 Code B18.9 – Chronic viral hepatitis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B18.9 – Chronic viral hepatitis, unspecified
What it is
B18.9 identifies chronic viral hepatitis when the specific virus is not documented. Use it for a long-lasting viral hepatitis diagnosis that remains unspecified in the record.
Clinical signs
Clinical features vary; refer to documentation. Patients may have persistent hepatitis noted on history, exam, imaging, or prior testing, but the virus type is not identified.
When to use this code
Use B18.9 when the provider documents chronic viral hepatitis without naming hepatitis B, C, or another specific virus. It is appropriate for ongoing follow-up, problem lists, or encounters where the diagnosis remains unspecified. If the chart later identifies the virus, code the more specific option instead.
Do not use for
Do not use this code for acute viral hepatitis or for chronic hepatitis with a documented specific viral cause. Check documentation if the record suggests a nonviral or other specified hepatitis.
Coding tip
Always look for the exact virus name in the assessment before choosing B18.9.