ICD-10-CM Alphabetic Index · FY 2026 102 Entries
Colitis in the ICD-10-CM Index ICD-10-CM
The main term Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) carries 102 index entries pointing to 54 ICD-10-CM codes. The default entry is K52.9, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
102
Index Entries
54
Codes Referenced
K52.9
Default Code
C
Letter
102 of 102 shown
ICD-10-CM
Index Entries Under Colitis 102 entries · 54 codes
Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) K52.9
allergic K52.29
with
food protein-induced enterocolitis syndrome K52.21
proctocolitis K52.29
amebic (acute) A06.0 see also Amebiasis
nondysenteric A06.2
anthrax A22.2
bacillary see Infection, Shigella
balantidial A07.0
Clostridioides difficile
not specified as recurrent A04.72
recurrent A04.71
Clostridium difficile
not specified as recurrent A04.72
recurrent A04.71
coccidial A07.3
collagenous K52.831
cystica superficialis K52.89
dietary counseling and surveillance (for) Z71.3
dietetic K52.29 see also Colitis, allergic
drug-induced K52.1
due to radiation K52.0
eosinophilic K52.82
food hypersensitivity K52.29 see also Colitis, allergic
giardial A07.1
granulomatous see Enteritis, regional, large intestine
indeterminate, so stated K52.3
infectious see Enteritis, infectious
ischemic K55.9
acute (subacute) K55.039 see also Ischemia, intestine, acute
chronic K55.1
due to mesenteric artery insufficiency K55.1
fulminant (acute) K55.039 see also Ischemia, intestine, acute
left sided K51.50
with
abscess K51.514
complication K51.519
specified NEC K51.518
fistula K51.513
obstruction K51.512
rectal bleeding K51.511
lymphocytic K52.832
membranous
psychogenic F54
microscopic K52.839
specified NEC K52.838
mucous see Syndrome, irritable, bowel
psychogenic F54
noninfective K52.9
specified NEC K52.89
polyposa see Polyp, colon, inflammatory
protozoal A07.9
pseudomembranous
not specified as recurrent A04.72
recurrent A04.71
pseudomucinous see Syndrome, irritable, bowel
regional see Enteritis, regional, large intestine
infectious A09
segmental see Enteritis, regional, large intestine
septic see Enteritis, infectious
spastic K58.9
with diarrhea K58.0
psychogenic F54
staphylococcal A04.8
foodborne A05.0
subacute ischemic K55.039 see also Ischemia, intestine, acute
thromboulcerative K55.039 see also Ischemia, intestine, acute
toxic NEC K52.1
due to
Clostridioides difficile
not specified as recurrent A04.72
recurrent A04.71
Clostridium difficile
not specified as recurrent A04.72
recurrent A04.71
transmural see Enteritis, regional, large intestine
trichomonal A07.8
tuberculous (ulcerative) A18.32
ulcerative (chronic) K51.90
with
complication K51.919
abscess K51.914
fistula K51.913
obstruction K51.912
rectal bleeding K51.911
specified complication NEC K51.918
enterocolitis see Enterocolitis, ulcerative
ileocolitis see Ileocolitis, ulcerative
mucosal proctocolitis see Proctocolitis, mucosal
proctitis see Proctitis, ulcerative
pseudopolyposis see Polyp, colon, inflammatory
psychogenic F54
rectosigmoiditis see Rectosigmoiditis, ulcerative
specified type NEC K51.80
with
complication K51.819
abscess K51.814
fistula K51.813
obstruction K51.812
rectal bleeding K51.811
specified complication NEC K51.818
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Related Index Terms
AmebiasisEnterocolitisIleocolitisAll index terms starting with CIndex to Diseases and InjuriesICD-10-CM Code Lookup
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
