Poisoning by unspecified agent primarily affecting the gastrointestinal system

This code signifies a toxic reaction or adverse effect from an unknown substance that primarily manifests with symptoms related to the digestive system. This includes conditions like acute gastroenteritis, abdominal pain, nausea, vomiting, or diarrhea, where the causative agent of the poisoning cannot be identified. The focus is on the systemic effects of the poison on the gastrointestinal tract.

Use this code when a patient presents with symptoms of poisoning, and the primary organ system affected is the gastrointestinal system, but the specific toxic agent is not documented or is unknown. This code is appropriate when documentation clearly states "poisoning" or "toxic effect" with GI manifestations, but lacks specificity regarding the substance ingested or absorbed.

• Only use this code when the specific toxic agent is truly unknown or unspecified in the medical record.
• Always sequence this code as the primary diagnosis when it represents the reason for the encounter.
• Avoid using this code if a more specific poisoning code (e.g., by drug, chemical, or biological substance) can be identified from the documentation.