Toxic effect of carb monx from utility gas, acc, subs

This code signifies a toxic reaction to carbon monoxide originating from utility gas, such as natural gas or propane, occurring due to an unintentional exposure. It specifically applies to encounters following the initial treatment of the poisoning, where the patient is receiving ongoing care for the effects of the exposure.

Use this code when a patient presents for follow-up care, rehabilitation, or management of persistent symptoms (e.g., neurological deficits, cardiac issues) stemming from an accidental carbon monoxide poisoning caused by utility gas. This includes situations where the patient is being monitored for long-term complications after the acute phase has passed.

• Ensure the documentation clearly states the source of carbon monoxide was utility gas and the intent was accidental.
• Confirm the encounter is for follow-up care, not the initial acute treatment, to justify the "D" seventh character.
• Do not use for intentional poisoning or poisoning from other carbon monoxide sources (e.g., vehicle exhaust, faulty furnace).