Is K59 a billable code?
No. K59 is a header code that groups 14 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
K59: Other functional intestinal disorders
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
K59 groups related diagnoses under other functional intestinal disorders. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under K59
- K59.00Constipation, unspecified
- K59.01Slow transit constipation
- K59.02Outlet dysfunction constipation
- K59.03Drug induced constipation
- K59.04Chronic idiopathic constipation
- K59.09Other constipation
- K59.1Functional diarrhea
- K59.2Neurogenic bowel, not elsewhere classified
- K59.31Toxic megacolon
- K59.39Other megacolon
- K59.4Anal spasm
- K59.81Ogilvie syndrome
- K59.89Other specified functional intestinal disorders
- K59.9Functional intestinal disorder, unspecified
K59 questions
What does K59 mean?
K59 is the ICD-10-CM code for Other functional intestinal disorders. It is in chapter 11, Diseases of the digestive system (K00-K95).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.