Poisoning by antithyroid drugs, assault, subs encntr

This code signifies a non-accidental overdose or toxic reaction to antithyroid medications, such as methimazole or propylthiouracil, that occurred due to an intentional act of harm by another person. The "subsequent encounter" indicates that the patient is receiving follow-up care for the poisoning after the initial treatment of the acute event.

Apply this code when documenting ongoing management, monitoring, or treatment for a patient who previously experienced an antithyroid drug poisoning as a result of an assault. This includes follow-up appointments for organ damage assessment, psychiatric evaluation related to the assault, or continued medication adjustments.

• Always pair this code with an external cause code (Y00-Y09) to specify the perpetrator and circumstances of the assault.
• Ensure documentation clearly distinguishes between initial treatment and subsequent care for the poisoning event.
• Do not use this code for accidental poisonings or self-harm; those require different intent indicators.