In simple words: Accidental penicillin overdose, first visit.

Poisoning by penicillins, accidental (unintentional), initial encounter.

Example 1: A 2-year-old child accidentally ingests their grandparent's amoxicillin pills and is brought to the emergency room with vomiting and a rash. This is their first visit for this issue., A teenager attempts suicide by overdosing on penicillin and presents to the hospital with altered mental status and seizures. This is their initial encounter for this event., An elderly patient with dementia accidentally takes double their prescribed dose of penicillin for several days and is brought to the doctor's office with confusion and lethargy. This is the first time they are seen for this particular poisoning incident.

Documentation should include the type of penicillin if known, the route of exposure (ingestion, injection, etc.), the approximate amount or duration of exposure, and the clinical manifestations of the poisoning. Any treatment given should also be documented. External cause codes (Chapter 20) should be used to identify the cause of the accidental poisoning, such as accidental ingestion of medication.If a foreign body is retained (e.g., pill fragments), code Z18.- should be used.

** This code is specifically for accidental (unintentional) poisoning.It represents the initial encounter for the poisoning event. The placeholder 'X' is used because a sixth character is required for the encounter status (A = initial encounter), but there is no fifth character code for this particular type of penicillin poisoning.Always use the most specific code available. If the specific type of penicillin is known, use a more specific code (T36.1X1A-T36.9X4S). This code excludes poisoning due to antineoplastic antibiotics (T45.1), locally applied antibiotics (T49.0), topically used antibiotics for the ear, nose, and throat (T49.6), and topically used antibiotics for the eye (T49.5).