K51.9 ICD-10-CA code: Ulcerative colitis, unspecified
K51.9 is the ICD-10-CA code for “Ulcerative colitis, unspecified” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
K51.9Ulcerative colitis, unspecified
Short description: Ulcerative colitis unspecified
ICD-10-CA · Canada · Also written K519
Index terms
Entries in CIHI’s alphabetical index that lead to K51.9. Searching the index by the condition the note names is how coders reach this code.
- Enteritis (diarrheal) (hemorrhagic), ulcerative (chronic)
- Colitis (acute) (catarrhal) (hemorrhagic), ulcerative (chronic)
- Enteritis (diarrheal) (hemorrhagic), chronic (noninfectious), ulcerative
Notes for K51.9
As CIHI prints them, with any note K51.9 takes from the headings above it.
Includes
- Noninfective inflammatory bowel diseaseFrom K50-K52 Noninfective enteritis and colitis
Excludes
Conditions classified elsewhere.
- Irritable bowel syndrome (K58.-)megacolon (K59.3)From K50-K52 Noninfective enteritis and colitis
- Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 11: Diseases of the digestive system (K00-K93)
Where K51.9 sits
- 1ChapterChapter 11: Diseases of the digestive system (K00-K93)
- 2Block K50-K52Noninfective enteritis and colitis
- 3Category K51Ulcerative colitis
- 4Valid code K51.9Ulcerative colitis, unspecified
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code K51.9 mean?
K51.9 is the ICD-10-CA code for “Ulcerative colitis, unspecified” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is K51.9 in ICD-10-CA?
K51.9 sits under K51 Ulcerative colitis, within K50-K52 Noninfective enteritis and colitis, within Chapter 11: Diseases of the digestive system (K00-K93).
What coding notes apply to K51.9?
ICD-10-CA lists Includes, Excludes notes for K51.9, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.