Toxic effect of hydrogen cyanide, self-harm, sequela

This code signifies the long-term or residual health problems resulting from a deliberate act of self-poisoning with hydrogen cyanide. These sequelae can manifest as chronic neurological deficits, organ damage, or persistent psychological effects that occurred after the acute phase of the poisoning. It indicates that the patient is now experiencing the lasting consequences of that intentional exposure.

Apply this code when documenting conditions that are a direct result of a past, intentional self-harm attempt involving hydrogen cyanide, and these conditions are no longer acute. This would be used for follow-up care, rehabilitation, or ongoing management of chronic issues stemming from the original poisoning event. Examples include chronic anoxic brain injury, persistent cardiac arrhythmias, or kidney damage attributed to the prior cyanide toxicity.

• Always sequence this sequela code after the code for the specific residual condition (e.g., chronic kidney disease, anoxic encephalopathy).
• Ensure documentation clearly links the current condition to the past hydrogen cyanide poisoning and specifies the intentional self-harm nature of the original event.
• The "S" in the 7th character indicates sequela and should only be used for conditions that are the late effects of the initial poisoning.