Toxic effect of unsp spider venom, undetermined, subs encntr

This code signifies a harmful reaction to venom from an unidentified spider, where the intent (accidental, intentional self-harm, assault) cannot be determined. It is used for encounters following the initial treatment of the toxic effect.

Apply this code when a patient presents for follow-up care (e.g., wound check, medication refill, monitoring for delayed symptoms) related to an unspecified spider bite, and the circumstances surrounding the bite are not documented as accidental, intentional, or assault. This is appropriate when the initial encounter for the acute toxic effect has already been coded.

• Requires an external cause code (X20.9XXD) to fully describe the event, if known.
• Do not use for initial encounters; refer to the 'A' (initial encounter) seventh character.
• Ensure documentation clearly supports "undetermined" intent and "subsequent encounter" for accurate assignment.