Toxic effect of rattlesnake venom, accidental, subs

This code signifies a patient presenting for follow-up care or treatment of complications arising from an accidental rattlesnake bite. The initial acute phase of envenomation has passed, and the current encounter addresses ongoing symptoms, wound management, or systemic effects.

Use this code for patients returning to the clinic or hospital for wound checks, debridement, management of coagulopathy, renal failure, or other delayed complications after an accidental rattlesnake envenomation. It is appropriate for subsequent visits following the initial treatment of the bite.

• Always pair with an external cause code (e.g., W59.21XA) to specify the cause and intent of the injury.
• Ensure documentation clearly indicates the encounter is for follow-up care or complications, not the initial acute treatment.
• Consider additional codes for specific complications, such as cellulitis (L03.11X) or acute kidney failure (N17.9).