Poisn by unsp drugs aff the autonm nervous sys, undet, init

This code signifies an adverse event resulting from an unknown drug that primarily impacts the body's involuntary functions, such as heart rate, digestion, or breathing. The intent behind the exposure to the drug is not documented or cannot be determined. This is the first time the patient is being treated for this specific poisoning.

Apply this code when a patient presents with symptoms of autonomic dysfunction (e.g., severe bradycardia, uncontrolled hypertension, respiratory depression, or altered mental status) and a drug exposure is suspected but the specific substance is unidentified. This is appropriate when the medical record does not specify whether the poisoning was accidental, intentional self-harm, assault, or therapeutic misadventure.

• Ensure documentation clearly states the drug is "unspecified" and the intent is "undetermined."
• Only use the "A" (initial encounter) seventh character for the first time the patient receives active treatment for this poisoning.
• Avoid this code if the specific drug or the intent of the poisoning is known or can be reasonably inferred from the medical record.