ICD-10-CM
ICD-10 code for Irritable, irritability ileum: K59.89
The ICD-10-CM index points "Irritable, irritability ileum" to K59.89, Other specified functional intestinal disorders. K59.89 is a billable code.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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More specific codes in K59
A header groups codes and is not billed. A billable code is one you can report.
- K59Other functional intestinal disordersHeader
- K59.0ConstipationHeader
- K59.00Constipation, unspecifiedBillable
- K59.01Slow transit constipationBillable
- K59.02Outlet dysfunction constipationBillable
- K59.03Drug induced constipationBillable
- K59.04Chronic idiopathic constipationBillable
- K59.09Other constipationBillable
- K59.1Functional diarrheaBillable
- K59.2Neurogenic bowel, not elsewhere classifiedBillable
- K59.3Megacolon, not elsewhere classifiedHeader
- K59.31Toxic megacolonBillable
- K59.39Other megacolonBillable
- K59.4Anal spasmBillable
- K59.8Other specified functional intestinal disordersHeader
- K59.81Ogilvie syndromeBillable
- K59.89Other specified functional intestinal disordersBillable
- K59.9Functional intestinal disorder, unspecifiedBillable
Excludes1
Excludes1 means these codes are not reported together.
From K59. A note on a category applies to every code under it.
Excludes2
Excludes2 means the other condition can be reported with this one when both are documented.
From K59. A note on a category applies to every code under it.
Related conditions
Related pages
- K59.89 code detailsNotes, nearby codes, CMS-HCC group
- Category K59Every code under it
- Chapter 11Diseases of the digestive system
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Irritable, irritability ileum?
The ICD-10-CM index points "Irritable, irritability ileum" to K59.89, Other specified functional intestinal disorders. K59.89 is a billable code.
Is K59.89 billable?
Yes. K59.89 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to K59.89?
The CDC tabular list gives 3 Excludes1 notes (not coded together), 1 Excludes2 note (may be coded together when both are documented) for K59.89 and the categories above it. They are listed on this page.
What chapter is K59.89 in?
Chapter 11. Diseases of the digestive system.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.