Poisoning by oth systemic anti-infect/parasit, acc, init

This code signifies an accidental overdose or adverse reaction to systemic anti-infective or antiparasitic medications not otherwise specified, resulting in a toxic effect on the patient. This includes unintentional ingestion, incorrect dosage administration, or other non-deliberate exposures to these drug classes. The "initial encounter" designation indicates the patient is receiving active treatment for the poisoning.

Apply this code when a patient presents to an emergency department or clinic with symptoms of poisoning due to an accidental exposure to a systemic anti-infective or antiparasitic drug, and the specific drug is known but does not have a more precise code. Examples include unintentional ingestion of a broad-spectrum antibiotic or an antimalarial medication by a child, or an adult mistakenly taking a double dose of an antifungal.

• Always sequence this code first when it represents the primary reason for the encounter.
• Requires an additional code to identify the specific drug (T36-T50 with 5th or 6th character for adverse effect or poisoning).
• Ensure the "A" for initial encounter is appropriate; subsequent encounters for the same poisoning would use "D" or "S."