Toxic effect of unsp gases, fumes and vapors, undet, init

This code signifies a patient's adverse health effects resulting from exposure to an unspecified gaseous, fume, or vapor substance. The intent of the exposure (e.g., accidental, intentional self-harm, assault) is unknown or not documented. This code is specifically for the initial encounter for this poisoning event.

Use this code when a patient presents with symptoms of poisoning due to an inhaled substance, but the specific gas, fume, or vapor is not identified in the medical record. It is appropriate when the circumstances surrounding the exposure are unclear or not documented as accidental, intentional, or assault. This code is only for the first time the patient is seen for this particular poisoning.

• Always sequence this code first, followed by codes for the specific manifestations of the toxic effect.
• Do not use if the specific substance is known; instead, code to the specific toxic effect of that substance.
• Ensure the documentation supports an "undetermined" intent and an "initial encounter" for this specific poisoning event.