Toxic effect of unspecified noxious substance eaten as food

This code signifies an adverse health effect resulting from the ingestion of an unknown harmful substance present in food. It describes a toxic reaction where the specific agent causing the poisoning cannot be identified. The patient presents with symptoms consistent with foodborne toxicity, but the exact source or chemical is undetermined.

Apply this code when a patient presents with signs and symptoms of poisoning due to something eaten, but the specific toxic substance is not documented or cannot be determined. This is appropriate for cases where a definitive diagnosis of a specific food poisoning (e.g., salmonella, botulism) or a known chemical ingestion is not established. Documentation should clearly indicate an ingested noxious substance and the inability to specify it.

• Only use this code when the specific toxic substance is truly unknown and cannot be identified through further investigation.
• Always sequence this code as a principal diagnosis when it is the primary reason for the encounter.
• Avoid using this code if a more specific code for food poisoning (e.g., bacterial, viral) or poisoning by a known chemical substance is available and supported by documentation.