Toxic effect of carb monx from unsp source, assault, subs

This code signifies a poisoning or adverse reaction to carbon monoxide due to an intentional act of harm by another person, where the specific source of the carbon monoxide is unknown. It indicates that the patient is receiving follow-up care for the sequelae of this assault, rather than initial treatment.

Apply this code when documenting ongoing treatment, rehabilitation, or monitoring for a patient who was intentionally exposed to carbon monoxide by another individual, and the origin of the gas is not specified. This would be used for subsequent visits after the initial acute care for the poisoning.

• Ensure the documentation clearly states "assault" as the intent and "subsequent encounter" for the visit.
• Do not use this code for accidental or self-harm exposures; specific codes exist for those circumstances.
• Always sequence this code after any codes for the specific manifestations or complications of the carbon monoxide poisoning.