Toxic effect of unspecified seafood, undetermined, sequela

This code signifies a long-term or residual health problem resulting from an unknown or unconfirmed toxic reaction to unspecified seafood. The original poisoning event's circumstances (accidental, intentional self-harm, assault) could not be determined.

Apply this code when a patient presents with a current condition clearly documented as a sequela of a past toxic exposure to seafood, and the intent of the original exposure is unknown. This is appropriate for chronic or late effects where the acute phase of the poisoning has resolved.

• Requires a seventh character of 'S' to indicate sequela.
• Only use when the specific type of seafood is not documented.
• Ensure documentation clearly links the current condition to the past seafood toxicity.