Toxic effect of venom of hornets, undetermined, sequela

This code signifies the long-term or residual health problems resulting from an exposure to hornet venom, where the intent of the exposure (e.g., accidental, intentional self-harm, assault) is not documented or cannot be determined. These sequelae can manifest as chronic pain, persistent allergic reactions, organ damage, or other lasting effects that occur after the initial acute phase of the envenomation has passed.

Apply this code when a patient presents with a current health condition that is directly attributed to a past hornet sting, and the circumstances surrounding the sting are unknown or unspecified in the medical record. This is appropriate for follow-up encounters addressing chronic issues stemming from such an event. It should be used after the acute toxic effects have resolved.

• Always use this code as a secondary diagnosis, following the code for the specific sequela being treated (e.g., chronic urticaria, kidney damage).
• Ensure documentation clearly links the current condition to a past hornet envenomation and indicates the undetermined intent.
• Do not use for acute toxic effects; refer to the appropriate acute T63.45- codes for initial encounters.