ICD-10 Code K92.81 – Gastrointestinal mucositis (ulcerative) (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K92.81 – Gastrointestinal mucositis (ulcerative)
What it is
This code identifies ulcerative inflammation and injury of the gastrointestinal mucosa. Use it when documentation describes mucositis affecting the GI tract, especially with ulceration.
Clinical signs
Clinical features may include abdominal pain, nausea, vomiting, diarrhea, or visible mucosal ulceration on endoscopy. Clinical features vary; refer to documentation.
When to use this code
Use K92.81 when the provider documents gastrointestinal mucositis with ulceration as the diagnosed condition. It may appear in notes describing chemotherapy-related or other treatment-associated mucosal injury, but only if explicitly documented. If the record is vague, check documentation before assigning the code.
Do not use for
Do not use this code for nonspecific abdominal pain, isolated nausea, or non-ulcerative mucosal irritation. Check documentation if the record instead describes a different GI disorder.
Coding tip
Code only when ulcerative GI mucositis is clearly documented, and verify any stated cause or site in the record.