In simple words: This code represents the long-term effects from intentional pertussis vaccine poisoning.

This code describes a poisoning due to a pertussis vaccine, or a combination vaccine containing a pertussis component, taken by the patient intentionally to harm themselves, with a subsequent sequela or late effect.

Example 1: A patient intentionally overdoses on a combination DTaP vaccine in a suicide attempt. They survive the initial event but experience long-term neurological complications., A patient with a history of depression intentionally injects themselves with multiple doses of pertussis vaccine. While they recover from the acute effects, they develop persistent localized pain and inflammation at the injection site., A patient intentionally ingests expired pertussis vaccine, resulting in gastrointestinal issues and long-term digestive problems.

Documentation should include the type and amount of vaccine ingested, the method of self-administration, evidence of intent to self-harm, and a clear description of the long-term effects or sequelae.

** It's important to differentiate between adverse effects (T50.A15) and poisoning (T50.A12) related to vaccines. Adverse effects are unintended and occur despite proper administration, while poisoning implies an overdose or improper use.