Poisn by pertuss vaccine, inc combin w pertuss, undet, init

This code signifies an adverse reaction to a pertussis-containing vaccine where the intent of the exposure is unknown. This could involve a patient experiencing symptoms such as fever, rash, or injection site reactions following vaccination, and it's unclear if the vaccine was administered incorrectly, was contaminated, or if the patient had an idiosyncratic reaction.

This code is appropriate for initial encounters where a patient presents with symptoms of poisoning or adverse effects attributed to a pertussis vaccine, and the circumstances surrounding the exposure (e.g., accidental, intentional self-harm, assault) have not yet been determined. It should be used when the provider cannot definitively classify the intent of the poisoning.

• Always assign an additional code for the specific manifestation of the poisoning.
• Do not use this code if the intent of the poisoning is known (e.g., accidental, intentional self-harm).
• This code is for the initial encounter; subsequent encounters for the same poisoning would require a different 7th character.