ICD-10-CM · Chapter 11 · K00-K95
K59 Other functional intestinal disorders
Excludes 1 (cannot be coded together)
- change in bowel habit NOS (R19.4)
- intestinal malabsorption (K90.-)
- psychogenic intestinal disorders (F45.8)
Excludes 2 (not included here)
- functional disorders of stomach (K31.-)
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| K59..0 | Constipation | No |
| K59..00 | Constipation, unspecified | Yes |
| K59..01 | Slow transit constipation | Yes |
| K59..02 | Outlet dysfunction constipation | Yes |
| K59..03 | Drug induced constipation | Yes |
| K59..04 | Chronic idiopathic constipation | Yes |
| K59..09 | Other constipation | Yes |
| K59..1 | Functional diarrhea | Yes |
| K59..2 | Neurogenic bowel, not elsewhere classified | Yes |
| K59..3 | Megacolon, not elsewhere classified | No |
| K59..31 | Toxic megacolon | Yes |
| K59..39 | Other megacolon | Yes |
| K59..4 | Anal spasm | Yes |
| K59..8 | Other specified functional intestinal disorders | No |
| K59..81 | Ogilvie syndrome | Yes |
| K59..89 | Other specified functional intestinal disorders | Yes |
| K59..9 | Functional intestinal disorder, unspecified | Yes |
Plain-language term for this code
The following entry in the US Medical Glossary corresponds to ICD-10-CM category K59:
- Constipation — Estreñimiento
Last reviewed: September 2026