ICD-10-CM category
K59: Other functional intestinal disorders
Codes under K59 (Other functional intestinal disorders). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| K59.0 | Constipation | — |
| K59.00 | Constipation, unspecified | ✓ |
| K59.01 | Slow transit constipation | ✓ |
| K59.1 | Functional diarrhea | ✓ |
| K59.02 | Outlet dysfunction constipation | ✓ |
| K59.2 | Neurogenic bowel, not elsewhere classified | ✓ |
| K59.03 | Drug induced constipation | ✓ |
| K59.3 | Megacolon, not elsewhere classified | — |
| K59.04 | Chronic idiopathic constipation | ✓ |
| K59.4 | Anal spasm | ✓ |
| K59.8 | Other specified functional intestinal disorders | — |
| K59.09 | Other constipation | ✓ |
| K59.9 | Functional intestinal disorder, unspecified | ✓ |
| K59.31 | Toxic megacolon | ✓ |
| K59.39 | Other megacolon | ✓ |
| K59.81 | Ogilvie syndrome | ✓ |
| K59.89 | Other specified functional intestinal disorders | ✓ |
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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