K59Header code — not billable
Other functional intestinal disorders
- Chapter
- 11. Diseases of the digestive system
- Category
- K59
- Effective date
- October 1, 2026
Related codes in category K59
K59.0ConstipationK59.00Constipation, unspecifiedYesK59.01Slow transit constipationYesK59.02Outlet dysfunction constipationYesK59.03Drug induced constipationYesK59.04Chronic idiopathic constipationYesK59.09Other constipationYesK59.1Functional diarrheaYesK59.2Neurogenic bowel, not elsewhere classifiedYesK59.3Megacolon, not elsewhere classifiedK59.31Toxic megacolonYesK59.39Other megacolonYes
Frequently asked questions
What is ICD-10 code K59?
K59 is an ICD-10-CM diagnosis code for Other functional intestinal disorders.
Is K59 a billable code?
No. K59 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is K59 in?
K59 falls under Chapter 11: Diseases of the digestive system.
When did K59 become effective?
K59 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to K59?
K59 belongs to category K59, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.