Poisoning by antithyroid drugs, intentional self-harm, init

This code signifies a patient presenting with adverse effects from antithyroid medications, such as methimazole or propylthiouracil, where the overdose was deliberately self-inflicted. The patient is in the initial phase of treatment for this poisoning.

Apply this code when documenting an emergency department visit or initial hospitalization for a patient who intentionally ingested an excessive amount of antithyroid drugs. This includes cases where the patient explicitly states self-harm intent or when clinical evidence strongly suggests it.

• Always assign an additional code for the specific antithyroid drug involved (from T36-T50).
• Ensure documentation clearly supports intentional self-harm; if accidental, a different intent code is required.
• This "initial encounter" code is used as long as the patient is receiving active treatment for the poisoning.