ICD-10 Code B18.1 – Chronic viral hepatitis B without delta-agent (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B18.1 – Chronic viral hepatitis B without delta-agent
What it is
B18.1 identifies chronic hepatitis B infection when the patient does not have hepatitis D coinfection. Use it for ongoing HBV infection documented as chronic.
Clinical signs
Clinical features vary; refer to documentation. Patients may be asymptomatic or have signs of chronic liver disease, and records may note persistent hepatitis B infection or carrier status.
When to use this code
Use B18.1 when the provider documents chronic viral hepatitis B and specifically indicates no delta-agent. It fits outpatient, inpatient, and problem-list documentation of established chronic HBV. If the record mentions hepatitis D coinfection, check documentation for a different code.
Do not use for
Do not use this code for acute hepatitis B or for hepatitis B with delta-agent. If the chart only says “hepatitis” without chronic viral hepatitis B, check documentation.
Coding tip
Confirm that “chronic” and “without delta-agent” are both documented before assigning B18.1.