Toxic effect of hydrocyanic acid and cyanides

This code signifies the adverse systemic effects resulting from exposure to hydrocyanic acid or cyanide compounds. It encompasses the physiological responses and organ damage caused by the toxic interference with cellular respiration.

Apply this code when documentation clearly indicates a patient's illness or injury is due to poisoning by hydrocyanic acid or cyanide. This includes accidental ingestions, inhalations, or dermal exposures to these substances, often seen in industrial accidents, chemical warfare, or deliberate self-harm.

• Always sequence this code as the primary diagnosis when it is the reason for the encounter.
• Look for specific mention of "cyanide poisoning," "hydrocyanic acid toxicity," or similar terms in the medical record.
• Do not confuse with adverse effects of therapeutic cyanide compounds (e.g., nitroprusside), which would be coded differently.