Underdosing of agents primarily affecting GI sys, subs

This code signifies that a patient is experiencing adverse effects or complications due to taking less than the prescribed or recommended dose of a medication primarily intended to treat gastrointestinal conditions. This underdosing is being addressed during a follow-up visit or during the healing phase of the condition.

Apply this code when documentation indicates a patient is not receiving the full therapeutic effect of a GI medication due to underdosing, and this is being managed in a subsequent encounter. Examples include a patient not taking enough antacids, laxatives, antiemetics, or ulcer medications, leading to ongoing or worsening GI symptoms.

• Ensure the documentation explicitly states "underdosing" and specifies a GI-related agent.
• The "D" seventh character indicates a subsequent encounter, meaning the patient is receiving routine care during the healing or recovery phase.
• Always code the specific adverse effect or symptom resulting from the underdosing as a primary diagnosis, with this code as a secondary diagnosis.