Toxic effect of other seafood, undetermined, sequela

This code signifies a long-term or residual health problem resulting from an unconfirmed or unspecified toxic exposure to seafood other than ciguatera, scombroid, or shellfish. This indicates that the acute phase of the poisoning has passed, but the patient continues to experience related symptoms or complications.

Apply this code when documentation clearly indicates a sequela (e.g., chronic neurological issues, persistent gastrointestinal problems) stemming from a past toxic seafood ingestion, and the specific type of seafood or toxin is not identified. This is appropriate for follow-up encounters where the initial acute poisoning event is no longer the primary focus.

• Requires a seventh character "S" to indicate sequela, meaning the residual effects of a past condition.
• Ensure documentation supports a causal link between the past seafood exposure and the current chronic condition.
• Do not use for acute poisoning events; those would utilize the initial or subsequent encounter seventh characters.