Poisoning by thyroid hormones and sub, accidental, init

This code signifies an adverse health event resulting from the accidental or unintentional ingestion or exposure to thyroid hormones or their synthetic substitutes. This includes situations where a patient has taken too much of their prescribed thyroid medication by mistake, or has inadvertently consumed someone else's thyroid medication. The "initial encounter" indicates that the patient is receiving active treatment for the poisoning.

Apply this code when a patient presents to an emergency department, urgent care, or physician's office with symptoms of thyroid hormone toxicity due to an accidental overdose or mistaken ingestion. This code is appropriate for the initial visit where the poisoning is diagnosed and treatment is initiated, such as gastric lavage, activated charcoal, or supportive care.

• Ensure documentation clearly states the poisoning was accidental or unintentional, not intentional self-harm.
• Always assign an additional code for the specific manifestation of the poisoning (e.g., tachycardia, arrhythmia, anxiety).
• For subsequent encounters related to the same poisoning event, use the appropriate subsequent encounter (D) or sequela (S) seventh character.