Poisoning by hydantoin derivatives, self-harm, init

This code signifies a patient presenting with adverse effects from intentionally self-administering hydantoin derivatives, a class of anticonvulsant medications. The poisoning is a result of a deliberate act to cause harm to oneself, and this is the initial medical encounter for this specific event.

Apply this code when documentation clearly states a patient overdosed on medications like phenytoin or fosphenytoin with suicidal intent. This code is appropriate for the first time the patient seeks medical attention for this particular poisoning episode, such as in an emergency department or initial inpatient admission.

• Always verify the intent (intentional self-harm) and the substance (hydantoin derivative) from the medical record.
• An additional code for the specific hydantoin derivative (e.g., T42.1X2A for phenytoin) is not required as T42.0X2A already specifies the class.
• Remember to also code any associated mental health diagnoses, such as major depressive disorder, if documented.