Poisoning by antithyroid drugs, undetermined, init encntr

This code signifies a patient presenting with adverse effects from antithyroid medications, where the intent of the exposure (e.g., accidental, intentional self-harm) cannot be determined. The "initial encounter" indicates the patient is receiving active treatment for the poisoning.

Apply this code when a patient is admitted or seen for the first time due to an antithyroid drug overdose or adverse reaction, and the physician's documentation does not specify whether the poisoning was accidental or intentional. This is appropriate for cases where the patient is acutely ill from the drug and the cause is unclear.

• Ensure documentation clearly states "undetermined" intent for the poisoning.
• Always assign an additional code for the specific antithyroid drug if known (e.g., from T38.2X1- to T38.2X3-).
• Do not use this code for adverse effects from therapeutic use; instead, refer to codes in the T38.2X5- or T38.2X6- series.