Adverse effect of unsp agents aff the GI sys, sequela

This code signifies a lasting or residual health problem affecting the digestive system that resulted from a past adverse reaction to an unknown substance. The original adverse effect is no longer acute, but its gastrointestinal consequences persist.

Apply this code when documenting chronic or permanent GI issues, such as persistent malabsorption, chronic diarrhea, or structural damage, that are directly attributable to a previously experienced adverse drug reaction or exposure to another unspecified agent. This is appropriate when the acute phase of the adverse effect has resolved, but the patient continues to experience related gastrointestinal sequelae.

• Always sequence this code second, after the code for the specific sequela (e.g., K90.9 for intestinal malabsorption, unspecified).
• Ensure the medical record clearly links the current gastrointestinal condition to a past adverse effect of an unspecified agent.
• The "S" seventh character indicates sequela, meaning the residual effects of a past condition.