Poisoning by unsp agents aff the GI sys, acc, sequela

This code signifies a long-term health problem or complication resulting from an accidental (unintentional) poisoning by an unknown substance that primarily impacted the digestive system. The initial poisoning event has resolved, but the patient continues to experience residual effects related to that exposure.

Apply this code when a patient presents with a current condition or symptom that is a direct consequence of a past, accidental poisoning by an unspecified agent affecting the GI tract. This is appropriate for follow-up encounters where the acute poisoning is no longer active but its lasting effects are being treated.

• Always ensure the "S" seventh character is used for sequela, indicating a late effect of the poisoning.
• Do not use this code for acute poisoning events; those require codes from the T36-T65 range with A or D seventh characters.
• Code any specific manifestations or symptoms of the sequela first, then use this code as a secondary diagnosis to indicate the etiology.