Poisoning by antithyroid drugs, accidental, subs

This code signifies an accidental overdose or adverse reaction to antithyroid medications, such as methimazole or propylthiouracil, occurring during a follow-up visit for the initial poisoning event. The patient is experiencing ongoing effects or complications from the unintentional ingestion of these drugs.

Apply this code when a patient presents for continued management or evaluation of symptoms related to an accidental antithyroid drug poisoning, after the initial encounter for the acute event. This includes visits for monitoring thyroid function, managing side effects, or addressing persistent toxicity.

• Ensure the encounter is for follow-up care of the poisoning, not the initial acute treatment.
• Verify the poisoning was accidental (unintentional) as opposed to intentional self-harm or assault.
• Always sequence this code after any codes for specific manifestations or complications of the poisoning.