Toxic effect of gases, fumes and vapors, undetermined, init

This code signifies a harmful reaction to an unspecified gas, fume, or vapor, where the intent (accidental, intentional self-harm, assault) cannot be determined. It indicates the patient is presenting for the first time for this specific poisoning event. The exposure has resulted in adverse health effects.

This code is appropriate for initial encounters when a patient presents with symptoms of poisoning from a gas, fume, or vapor, and the specific substance is known but not categorized elsewhere (e.g., not carbon monoxide, nitrogen oxides, or sulfur dioxide). It is used when the circumstances surrounding the exposure are unclear or cannot be definitively classified as accidental, intentional, or assault.

• Always assign an additional code for the specific manifestation of the toxic effect (e.g., respiratory failure, neurological symptoms).
• Only use this code for the initial encounter for treatment of the poisoning; subsequent encounters would use a different seventh character.
• Ensure documentation clearly states the type of gas, fume, or vapor if known, and that the intent is undetermined.