ICD-10-CM · FY 2026 APRIL UPDATE
K59
Other functional intestinal disorders
Diagnosis reference
Nonbillable categoryThis entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.
Effective periodOctober 1, 2026–September 30, 2027
SourceCMS ICD-10-CM order file
ClassificationDiagnosis · clinical modification
Related entries
Up to 30 descendants in this category
| CODE | DESCRIPTION | TYPE |
|---|---|---|
| K59.0 | Constipation | Category |
| K59.00 | Constipation, unspecified | Billable |
| K59.01 | Slow transit constipation | Billable |
| K59.02 | Outlet dysfunction constipation | Billable |
| K59.03 | Drug induced constipation | Billable |
| K59.04 | Chronic idiopathic constipation | Billable |
| K59.09 | Other constipation | Billable |
| K59.1 | Functional diarrhea | Billable |
| K59.2 | Neurogenic bowel, not elsewhere classified | Billable |
| K59.3 | Megacolon, not elsewhere classified | Category |
| K59.31 | Toxic megacolon | Billable |
| K59.39 | Other megacolon | Billable |
| K59.4 | Anal spasm | Billable |
| K59.8 | Other specified functional intestinal disorders | Category |
| K59.81 | Ogilvie syndrome | Billable |
| K59.89 | Other specified functional intestinal disorders | Billable |
| K59.9 | Functional intestinal disorder, unspecified | Billable |
Use the complete reference
This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.
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