K59.1Billable
Functional diarrhea
- Chapter
- 11. Diseases of the digestive system
- Category
- K59
- Effective date
- October 1, 2026
Related codes in category K59
K59Other functional intestinal disordersK59.0ConstipationK59.00Constipation, unspecifiedYesK59.01Slow transit constipationYesK59.02Outlet dysfunction constipationYesK59.03Drug induced constipationYesK59.04Chronic idiopathic constipationYesK59.09Other constipationYesK59.2Neurogenic bowel, not elsewhere classifiedYesK59.3Megacolon, not elsewhere classifiedK59.31Toxic megacolonYesK59.39Other megacolonYes
Frequently asked questions
What is ICD-10 code K59.1?
K59.1 is an ICD-10-CM diagnosis code for Functional diarrhea.
Is K59.1 a billable code?
Yes. K59.1 is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is K59.1 in?
K59.1 falls under Chapter 11: Diseases of the digestive system.
When did K59.1 become effective?
K59.1 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to K59.1?
K59.1 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.