Underdosing of antiviral drugs, sequela

This code signifies a patient's current health condition or complication that is a direct result of a past underdosing of antiviral medication. This means the patient did not receive enough of the prescribed antiviral drug, leading to a lasting effect or consequence. The underdosing itself is no longer the active problem, but its lingering impact is.

Use this code when documenting a chronic or residual condition that developed because a patient previously took less than the prescribed amount of an antiviral drug. This applies to situations where the underdosing event is in the past, and the current encounter is for managing the long-term effects, such as persistent viral infection or organ damage attributed to insufficient treatment.

• Always sequence this code after the code(s) for the specific sequela (the resulting condition).
• Ensure documentation clearly links the current condition to a historical underdosing of an antiviral agent.
• Do not use this code for acute underdosing events; it is specifically for the lasting effects.