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

This code signifies poisoning due to carbon monoxide exposure specifically originating from utility gas, where the patient deliberately inflicted the harm upon themselves. It indicates the initial phase of treatment for such an event, focusing on the acute presentation and management.

Apply this code when a patient presents with symptoms of carbon monoxide poisoning, and the source is confirmed to be utility gas (e.g., from a gas stove or furnace). Crucially, documentation must clearly state the intent was self-harm, such as a suicide attempt. This code is appropriate for the first encounter related to this specific poisoning episode.

• Ensure documentation explicitly states "intentional self-harm" or "suicide attempt" for the carbon monoxide exposure.
• Verify the source of carbon monoxide is specifically utility gas, not other sources like vehicle exhaust or industrial fumes.
• The "A" in the 7th character indicates an initial encounter; subsequent care for the same poisoning would use a different 7th character.