Acute delta-(super) infection of hepatitis B carrier

This code signifies an acute hepatitis D (delta) infection occurring in an individual who is already a chronic carrier of hepatitis B virus. Hepatitis D can only replicate in the presence of hepatitis B, making co-infection or superinfection possible. This specific code indicates a new, acute delta infection superimposed on an existing chronic hepatitis B state.

Use this code when diagnostic testing confirms an acute hepatitis D infection in a patient with documented chronic hepatitis B. This typically involves positive IgM anti-HDV antibodies and HBsAg positivity. Documentation should clearly indicate the acute nature of the delta infection and the pre-existing chronic hepatitis B carrier status.

• Always sequence this code after the code for chronic hepatitis B (B18.0 or B18.1) to accurately reflect the superinfection.
• Ensure documentation specifies "acute" delta infection; otherwise, B17.1 (chronic delta superinfection) may be more appropriate.
• Distinguish from B16.0 or B16.1, which represent acute hepatitis B with delta agent, indicating co-infection rather than superinfection.