Toxic effect of strychnine and its salts, undetermined, subs

This code signifies a patient presenting with symptoms resulting from exposure to strychnine or its derivatives, where the intent of the exposure (e.g., accidental, intentional self-harm, assault) cannot be determined. The patient is in the recovery phase or receiving follow-up care for the toxic effects.

Apply this code for patients who have previously been treated for strychnine poisoning and are now returning for ongoing management, monitoring of residual effects, or complications. This is appropriate when the initial encounter's documentation did not definitively establish the circumstances of the poisoning.

• Ensure documentation clearly indicates a "subsequent encounter" for the toxic effect, not the initial presentation.
• Only use this code when the intent of the poisoning is explicitly documented as "undetermined."
• Code any specific symptoms or complications of the strychnine toxicity separately, if applicable.