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.
- congenital megacolon (aganglionic) (Q43.1)
- megacolon (due to) (in) Chagas' disease (B57.32)
- megacolon (due to) (in) Clostridium difficile (A04.7-)
- megacolon (due to) (in) Hirschsprung's disease (Q43.1)
- 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.-)
Code first
Code the underlying condition first, then this code.
- , if applicable (T51-T65) to identify toxic agent
Related codes
K59.04Chronic idiopathic constipation ICD-10-CMK59.09Other constipation ICD-10-CMK59.1Functional diarrhea ICD-10-CMK59.2Neurogenic bowel, not elsewhere classified 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 K59.31 a billable code?
Yes. K59.31 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.