Toxic effect of carb monx from unsp source, undet, init

This code signifies a patient presenting with symptoms or signs of carbon monoxide poisoning where the specific origin of the exposure is unknown. The intent of the poisoning (accidental, intentional self-harm, assault) cannot be determined from the available documentation.

Apply this code for initial encounters when a patient is diagnosed with carbon monoxide toxicity, but the medical record does not specify whether the exposure was from a vehicle exhaust, faulty appliance, or other particular source. It is also appropriate when the clinician cannot definitively state if the exposure was accidental or intentional.

• Ensure documentation clearly states "undetermined" intent if known, or if the intent cannot be established.
• Only use for the initial encounter for treatment of the acute toxic effect.
• Avoid if a specific source (e.g., vehicle exhaust, utility gas) or intent (e.g., accidental, intentional self-harm) is documented.