Toxic effect of carb monx from mtr veh exhaust, undet, subs

This code signifies a harmful physiological response to carbon monoxide exposure originating from motor vehicle exhaust, where the intent (accidental, intentional, or assault) cannot be determined. It is used for encounters following the initial treatment of the acute toxic effect.

Apply this code for follow-up visits, rehabilitation, or management of long-term sequelae related to carbon monoxide poisoning from vehicle exhaust, when the circumstances of exposure remain unclear. This includes situations where a patient is being monitored for neurological deficits or cardiac complications after the initial acute phase.

• Requires an additional code for any associated manifestations or sequelae of the poisoning.
• The "D" seventh character indicates a subsequent encounter, meaning the patient is receiving routine care during the healing or recovery phase.
• Distinguish from initial encounters (A) or sequela encounters (S) based on the patient's current stage of care.