Toxic effect of carb monx from utility gas, self-harm, subs

This code signifies a patient presenting for follow-up care related to carbon monoxide poisoning from utility gas, where the exposure was intentionally self-inflicted. The patient has already received initial treatment for the acute event and is now being seen for ongoing management, complications, or recovery.

Apply this code for encounters after the initial treatment of a patient who attempted suicide by inhaling carbon monoxide from utility gas. This includes visits for monitoring neurological sequelae, pulmonary complications, psychological evaluation, or other ongoing care directly related to the poisoning event.

• Ensure the encounter is for subsequent care, not the initial acute treatment.
• Verify the source of carbon monoxide was utility gas and the intent was self-harm.
• Always code an accompanying mental health diagnosis for the self-harm intent.