Toxic effect of unsp snake venom, accidental, subs

This code signifies a patient presenting for follow-up care or management of complications arising from an accidental exposure to an unspecified snake venom. The initial acute phase of treatment has concluded, and the patient is now receiving ongoing care for the toxic effects.

Apply this code for patients returning for wound care, monitoring of organ damage, physical therapy, or medication adjustments related to a past, unintentional snakebite where the specific snake species was not identified. This is appropriate for any encounter after the initial emergency treatment.

• Ensure documentation clearly indicates the encounter is for follow-up or sequelae, not the initial treatment.
• Confirm the snake species was not identified in the medical record.
• Pair with external cause codes (e.g., W59.21XA) to fully describe the circumstances of the injury.