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

This code signifies a patient presenting for follow-up care related to the harmful effects of inhaling or absorbing unspecified gases, fumes, or vapors. The specific substance causing the toxic effect is known, but the intent (e.g., accidental, intentional self-harm, assault) of the exposure remains unclear.

Apply this code when a patient returns for ongoing treatment, monitoring, or evaluation after an initial diagnosis of toxic exposure to a specified gas, fume, or vapor, and the circumstances surrounding the exposure are still under investigation or could not be determined. This is appropriate for subsequent visits where the patient is still experiencing symptoms or complications from the initial exposure.

• Requires a seventh character "D" for subsequent encounter, indicating ongoing care.
• Ensure the medical record clearly documents the specific type of gas, fume, or vapor involved.
• Do not use if the intent of the exposure (e.g., accidental, intentional) is known; instead, select a more specific intent code.