Poisoning by oth agents aff GI sys, undetermined, subs

This code signifies a poisoning event involving an unspecified substance that primarily impacts the gastrointestinal system, where the intent (accidental, intentional self-harm, assault) cannot be determined. The "D" suffix indicates that this is a subsequent encounter for the poisoning, meaning the patient is receiving follow-up care after the initial treatment of the acute poisoning.

This code is appropriate for follow-up visits where a patient is being monitored or treated for ongoing effects of a poisoning by an unknown agent primarily affecting the GI tract. Examples include persistent nausea, vomiting, diarrhea, or abdominal pain after initial emergency treatment for an ingestion of an unidentified substance. It should be used when the documentation clearly states the intent of the poisoning is undetermined.

• Ensure documentation specifies "undetermined" intent for the poisoning; otherwise, a different 7th character (A, B, S) or intent code may be more appropriate.
• This code is for subsequent encounters only; use the "A" (initial encounter) or "B" (initial encounter for sequela) suffix for the initial treatment.
• Always code the specific substance if known, using a more precise T-code from categories T36-T65, before resorting to "other agents" or "unspecified."