Toxic effect of hydrogen cyanide, undetermined, init encntr

This code signifies an adverse health effect resulting from exposure to hydrogen cyanide, where the intent of the exposure (e.g., accidental, intentional self-harm, assault) cannot be determined. It indicates the patient is in the acute phase of treatment for this toxic exposure.

Use this code for patients presenting with signs and symptoms of hydrogen cyanide poisoning when the circumstances surrounding the exposure are unclear or under investigation. This applies to initial evaluations and treatments in settings like emergency departments or during the first hospitalization for the poisoning.

• Always sequence this code first when it represents the primary reason for the encounter.
• Do not use this code for sequelae or long-term effects; specific codes exist for those.
• Ensure documentation clearly supports "undetermined" intent and initial encounter status.