K59 – Other functional intestinal disorders
ICD-10-CM 2027 diagnosis code · Other diseases of intestines
ICD-10-CM code
K59
- Code
K59(claims format:K59)- Description
- Other functional intestinal disorders
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 11. Diseases of the digestive system (K00-K95)
- Block
- K55-K64 Other diseases of intestines
Billable codes under K59
K59 is a header code and cannot be used on claims. Choose the most specific code:
- K59.0 – ConstipationHeader (more codes below)
- K59.1 – Functional diarrheaBillable
- K59.2 – Neurogenic bowel, not elsewhere classifiedBillable
- K59.3 – Megacolon, not elsewhere classifiedHeader (more codes below)
- K59.4 – Anal spasmBillable
- K59.8 – Other specified functional intestinal disordersHeader (more codes below)
- K59.9 – Functional intestinal disorder, unspecifiedBillable
Notes for K59
Excludes1 (not coded here):
Excludes2 (not included here):
- functional disorders of stomach (K31.-)
Frequently asked questions
What is ICD-10 code K59?
K59 is the ICD-10-CM code for other functional intestinal disorders, in the block K55-K64 (Other diseases of intestines).
Is K59 a billable code?
No. K59 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.