Poisoning by carbonic acid anhydrase inhibitors

This code signifies an adverse reaction or overdose resulting from the ingestion or exposure to carbonic anhydrase inhibitors. These medications are primarily used as diuretics, in the treatment of glaucoma, and for altitude sickness, by reducing bicarbonate reabsorption in the kidneys and aqueous humor production in the eye. The poisoning can manifest with symptoms such as metabolic acidosis, electrolyte imbalances, central nervous system depression, or renal dysfunction.

Assign this code when documentation clearly indicates a patient's condition is due to poisoning by a carbonic anhydrase inhibitor. This includes accidental overdose, intentional self-harm, or adverse effects from therapeutic use that reach toxic levels. Supporting documentation would include physician notes detailing the drug involved, the circumstances of the poisoning, and the patient's clinical presentation linked to the toxic effects of the medication.

• Always code the specific manifestation of the poisoning first, if applicable, followed by this poisoning code.
• Distinguish between adverse effects from proper therapeutic use (e.g., therapeutic drug levels causing expected side effects) and actual poisoning (e.g., overdose or toxic reaction).
• Ensure the documentation specifies a carbonic anhydrase inhibitor; do not use for other diuretic classes.