Toxic effect of venom of centipede/millipede, undet, sequela

This code signifies a long-term or late-onset health problem resulting from exposure to centipede or venomous millipede venom, where the specific circumstances of the exposure (accidental, intentional self-harm, assault) are unknown or not documented. These sequelae can manifest as chronic pain, neurological deficits, skin changes, or other persistent issues directly attributable to the original envenomation.

Apply this code when a patient presents with a current condition that is a documented consequence of a past centipede or venomous millipede envenomation, and the intent or circumstances of the original exposure are not specified in the medical record. This is appropriate for follow-up encounters addressing these persistent effects after the acute phase of the envenomation has passed.

• Always assign this code as a secondary diagnosis, following the code for the specific sequela (e.g., chronic pain, dermatitis).
• Ensure documentation clearly links the current condition to a past centipede or venomous millipede envenomation.
• Only use the "S" seventh character for true sequelae; for acute toxic effects, use the appropriate initial or subsequent encounter character.