ICD-10 Code B18.0 – Chronic viral hepatitis B with delta-agent (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B18.0 – Chronic viral hepatitis B with delta-agent
What it is
This code identifies chronic hepatitis B infection with hepatitis D, also called delta-agent coinfection. Use it when the record shows long-standing HBV plus delta virus involvement.
Clinical signs
Clinical features vary; refer to documentation. Patients may have chronic hepatitis findings such as persistent liver inflammation, fatigue, jaundice, or evidence of chronic viral coinfection.
When to use this code
Use B18.0 when the provider documents chronic hepatitis B with delta-agent, delta virus, or hepatitis D coinfection. It fits cases where both infections are part of the confirmed diagnosis. Check documentation if the record only mentions hepatitis B without delta-agent.
Do not use for
Do not use this code for acute hepatitis B, isolated hepatitis D without chronic hepatitis B, or unspecified viral hepatitis. If the chart does not clearly state chronic coinfection, check documentation.
Coding tip
Assign B18.0 only when chronic HBV and delta-agent coinfection are explicitly documented.