K59.9 Functional intestinal disorder, unspecified
ICD-10-CM · CMS code reference
Official ICD-10-CM description: Functional intestinal disorder, unspecified
Coding notes
From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.
Excludes1
Not coded together with this code. The exception is when the two conditions are unrelated to each other.
- change in bowel habit NOS (R19.4)
- intestinal malabsorption (K90.-)
- psychogenic intestinal disorders (F45.8)
Excludes2
Not part of this code, but both can be coded when both are documented.
- functional disorders of stomach (K31.-)
Related codes
K59.09Other constipation ICD-10-CMK59.1Functional diarrhea ICD-10-CMK59.2Neurogenic bowel, not elsewhere classified ICD-10-CMK59.31Toxic megacolon ICD-10-CMK59.39Other megacolon ICD-10-CMK59.4Anal spasm ICD-10-CMK59.81Ogilvie syndrome ICD-10-CMK59.89Other specified functional intestinal disorders ICD-10-CM
Common questions
Is K59.9 a billable code?
Yes. K59.9 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.