Toxic effect of unsp snake venom, undetermined, sequela

This code signifies a long-term or late-stage adverse health effect resulting from exposure to an unspecified snake's venom, where the intent of the exposure (accidental vs. intentional) cannot be determined. It indicates that the acute phase of envenomation has passed, but the patient continues to experience related health issues.

Apply this code when a patient presents with a sequela (e.g., chronic pain, neurological deficit, tissue damage) clearly attributable to a past snakebite, but the specific type of snake is unknown, and the circumstances of the bite are unclear regarding intent. This code is appropriate for follow-up encounters addressing these persistent, venom-related complications.

• Ensure documentation explicitly states the condition is a sequela of a past snake envenomation.
• Only use when the snake type and intent are truly "unspecified" and "undetermined" respectively.
• Always code the specific manifestation of the sequela first, followed by this code as an external cause.