ICD-10-CM Tabular Index · Chapter 11 · FY 2026 K55–K64
Other diseases of intestines (K55-K64) ICD-10-CM
The K55–K64 section covers other diseases of intestines with 206 ICD-10-CM diagnosis codes, of which 157 are billable in fiscal year 2026. The section is organized into the 10 code ranges listed below.
✓ Built from the official CMS FY 2026 datasetEffective Oct 1, 2025 – Sep 30, 2026
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the K55–K64 Code Range
ICD-10 codes K55-K64 are used to classify various diseases of the intestines and anorectal regions, excluding common intestinal infections or inflammatory bowel diseases. This range covers vascular intestinal disorders, obstructions, diverticular diseases, irritable bowel syndrome, functional intestinal problems, and anorectal conditions such as fissures, fistulas, abscesses, and hemorrhoids.
This chapter addresses vascular disorders (K55) like acute and chronic ischemia or infarction of the small or large intestine, also known by terms like visceral ischemia or mesenteric vein thrombosis. Codes under K56 depict intestinal obstructions and paralytic ileus without hernia, including conditions such as fecal impaction, adhesions, and volvulus. The K57 series details diverticular diseases of the small and large intestine with or without complications like perforation, abscess, or bleeding. K58 covers variants of irritable bowel syndrome, like diarrhea and constipation types. Functional intestinal disorders like constipation, megacolon, and neurogenic bowel appear under K59. The codes from K60-K64 focus on conditions affecting the anus and rectum, including anal fissures, fistulas, abscesses, prolapse, stenosis, hemorrhage, ulcerations, radiation proctitis, and hemorrhoids. These codes assist coders and clinicians in accurately identifying and documenting diverse intestinal and anorectal disorders, guiding treatment and billing processes.
Questions About This Page
How many codes are in the K55-K64 range?
The K55-K64 range contains 206 ICD-10-CM diagnosis codes in FY 2026. 157 of them are billable, and the rest are category headers that organize the section.
What conditions does K55-K64 cover?
The range covers other diseases of intestines. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
congenital stricture or stenosis of intestine Q41Q42
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
fissure and fistula of anal and rectal regions with abscess or cellulitis K61
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
abscess or cellulitis of anal and rectal regions K61
anal sphincter tear healed nontraumatic old K62.81
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
anal canal
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
piles
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
hemorrhoids complicating childbirth and the puerperium O87.2
