Gastrointestinal mucositis (ulcerative)

This code represents inflammation and ulceration of the mucous membranes lining the gastrointestinal tract, excluding the mouth. This condition is often a side effect of chemotherapy or radiation therapy, leading to symptoms like abdominal pain, diarrhea, and malabsorption.

Assign this code when documentation specifies mucositis affecting any part of the GI tract from the esophagus to the anus, excluding oral involvement. This diagnosis is typically supported by physician notes detailing symptoms, endoscopic findings, or a direct statement of "gastrointestinal mucositis."

• Differentiate from oral mucositis (K12.3-) and other site-specific mucositis conditions.
• Always code the underlying cause (e.g., adverse effect of antineoplastic drug) first, if applicable.
• Ensure documentation clearly specifies "gastrointestinal" to avoid confusion with other mucositis sites.