Advrs effect of pertuss vaccine, inc combin w pertuss, subs

This code signifies an adverse reaction experienced by a patient due to a pertussis-containing vaccine, such as DTaP or Tdap, that is being managed during a follow-up visit. The reaction is not occurring at the time of initial presentation, but rather during a subsequent encounter for assessment or treatment of the previously identified adverse effect.

Apply this code when a patient presents for ongoing care related to a documented adverse effect from a pertussis vaccine. Examples include follow-up appointments for persistent injection site reactions, systemic symptoms like fever or rash, or neurological events that occurred after vaccine administration and require continued monitoring or treatment.

• Always use an additional code to identify the specific adverse effect, such as a rash (L27.1) or fever (R50.9).
• Ensure the medical record clearly documents the link between the pertussis vaccine and the adverse effect, and that the encounter is for follow-up care.
• Distinguish from initial encounters for adverse effects, which would use the "A" seventh character.