Underdosing of unsp agents aff the GI sys, sequela

This code signifies a patient's underdosing of a medication or substance that primarily impacts their gastrointestinal system, with the current encounter addressing a sequela or late effect of that underdosing. It indicates that the patient did not receive enough of the prescribed agent, leading to a chronic or residual condition affecting their digestive tract.

Use this code when documenting a patient presenting with a long-term consequence, such as chronic malabsorption, persistent nausea, or recurrent GI bleeding, directly attributable to a past instance of insufficient medication intake that was intended to treat a GI condition. This applies when the acute underdosing event is no longer the primary focus, but its lasting effects are being managed.

• Ensure the documentation clearly links the current GI sequela to a previous underdosing event.
• Verify that the underdosed agent's primary therapeutic target was the gastrointestinal system.
• The "S" in the 7th character indicates a sequela; do not use for initial or subsequent encounters for the acute underdosing itself.