ICD-10 Code K63.82 – Intestinal microbial overgrowth (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K63.82 – Intestinal microbial overgrowth
What it is
K63.82 identifies intestinal microbial overgrowth, a condition where excessive microorganisms are present in the intestine. Use it when the documentation specifically names this diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings may include bloating, abdominal discomfort, gas, and altered bowel habits, but you should not code symptoms alone.
When to use this code
Use K63.82 when the provider documents intestinal microbial overgrowth or an equivalent diagnosis in the assessment. It may also apply when testing or specialist evaluation supports the documented condition. If the record only describes nonspecific gastrointestinal symptoms, check documentation before assigning this code.
Do not use for
Do not use this code for isolated abdominal pain, diarrhea, or bloating without a documented diagnosis. Check documentation if the record instead identifies another intestinal disorder or infection.
Coding tip
Code the documented diagnosis, not the presumed cause or symptom pattern.