Poisoning by pertussis vaccine, including combinations with a pertussis component

This code signifies an adverse reaction or toxic effect resulting from the administration of a pertussis-containing vaccine. It covers systemic or localized symptoms arising from the vaccine itself, rather than from improper administration technique or a pre-existing condition.

Apply this code when a patient presents with symptoms directly attributable to a pertussis vaccine, such as fever, rash, localized swelling, or neurological reactions, and the physician explicitly links these symptoms to the vaccine. Documentation should clearly state "pertussis vaccine poisoning" or a similar adverse effect.

• Always sequence this code as a secondary diagnosis following the code for the specific manifestation of the poisoning.
• Distinguish from allergic reactions (995.2x) or complications of medical care (997.xx-999.xx) if the documentation specifies those etiologies.
• Ensure the medical record clearly identifies the pertussis vaccine as the causative agent of the adverse event.