Irritable bowel syndrome (K58) ICD-10-CM
The K58 code range covers irritable bowel syndrome with 6 ICD-10-CM diagnosis codes. 5 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- irritable colon
- spastic colon
Codes in the K58 Range 6 codes · 5 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the K58 range.
Irritable Bowel Syndrome
A disorder with chronic or recurrent colonic symptoms without a clearcut etiology. This condition is characterized by chronic or recurrent ABDOMINAL PAIN, bloating, MUCUS in FECES, and an erratic disturbance of DEFECATION.
About the K58 Code Range
ICD-10 code K58 and its subcategories identify different forms of irritable bowel syndrome (IBS), a common gastrointestinal disorder characterized by abdominal discomfort and altered bowel habits. These codes help specify whether IBS manifests with diarrhea, constipation, a mix of symptoms, or is unspecified.
The ICD-10 code for irritable bowel syndrome (K58) covers the general diagnosis. More precise coding includes K58.0 for IBS with diarrhea, capturing terms like “irritable bowel syndrome with diarrhea” and childhood variants. K58.1 denotes IBS with constipation, while K58.2 describes mixed IBS, involving both diarrhea and constipation symptoms. K58.8 is used for other specified IBS types. Finally, K58.9 codes unspecified IBS, which includes related terms such as “colonospasm,” “bowel spasm,” and “enterospasm.” These distinctions assist healthcare providers and coders in accurately documenting IBS cases based on symptom patterns, supporting clearer treatment plans and statistical tracking.
Questions About This Page
How many billable codes are in the K58 range?
Of the 6 codes in this range, 5 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the K58 range classify?
The range classifies irritable bowel syndrome. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
