ICD-10 Code K58.1 – Irritable bowel syndrome with constipation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K58.1 – Irritable bowel syndrome with constipation
What it is
K58.1 identifies irritable bowel syndrome in which constipation is the predominant bowel pattern. It is a functional gastrointestinal disorder, meaning symptoms occur without a structural cause found on routine evaluation.
Clinical signs
Typical features include recurrent abdominal pain or discomfort with constipation, often with bloating or a sense of incomplete evacuation. Clinical features vary; refer to documentation.
When to use this code
Use K58.1 when the provider documents IBS with constipation, constipation-predominant IBS, or an equivalent diagnosis. The record should support IBS as the condition being treated, not simple constipation alone. If documentation is unclear about the bowel pattern, check documentation before coding.
Do not use for
Do not use this code for constipation without a documented IBS diagnosis. Also avoid it when the chart describes another bowel disorder, such as inflammatory bowel disease or acute gastroenteritis.
Coding tip
Code K58.1 only when constipation-predominant IBS is explicitly documented; otherwise, query for clarification.