Toxic effect of carbon monoxide

This code represents the adverse health effects resulting from exposure to carbon monoxide (CO), a colorless, odorless gas. The toxic effect occurs when CO replaces oxygen in red blood cells, leading to cellular hypoxia and organ damage. Symptoms can range from headache and nausea to severe neurological impairment, cardiac issues, and death, depending on the level and duration of exposure.

Use this code when documenting a patient presenting with symptoms or confirmed poisoning due to carbon monoxide inhalation. This includes accidental exposures from faulty heating systems, car exhaust, or fires, as well as intentional exposures. Documentation should clearly state the patient's exposure to carbon monoxide and the resulting toxic effects.

• Always code the specific manifestation of the carbon monoxide poisoning (e.g., anoxic brain damage, cardiac arrhythmia) as a primary diagnosis, with this code as a secondary diagnosis to indicate the cause.
• Distinguish from carbon monoxide poisoning due to suicidal intent (E-codes for external cause).
• Do not use for simple exposure without documented toxic effects.