ICD-10 Code for Colitis
Also indexed as (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic)
The ICD-10-CM code for colitis is K52.9 — Noninfective gastroenteritis and colitis, unspecified. This is the code the Alphabetic Index gives for colitis with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
BillableUnspecified
K52.9 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which colitis code should you use?
The Alphabetic Index lists 54 codes under Colitis. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| allergic | K52.29 | Other allergic and dietetic gastroenteritis and colitis | |
| amebic | A06.0 | Acute amebic dysentery | |
| anthrax | A22.2 | Gastrointestinal anthrax | |
| balantidial | A07.0 | Balantidiasis | |
| coccidial | A07.3 | Isosporiasis | |
| collagenous | K52.831 | Collagenous colitis | |
| cystica superficialis | K52.89 | Other specified noninfective gastroenteritis and colitis | |
| dietary counseling and surveillance | Z71.3 | Dietary counseling and surveillance | |
| dietetic | K52.29 | Other allergic and dietetic gastroenteritis and colitis | |
| drug-induced | K52.1 | Toxic gastroenteritis and colitis | |
| due to radiation | K52.0 | Gastroenteritis and colitis due to radiation | |
| eosinophilic | K52.82 | Eosinophilic colitis | |
| food hypersensitivity | K52.29 | Other allergic and dietetic gastroenteritis and colitis | |
| giardial | A07.1 | Giardiasis [lambliasis] | |
| indeterminate, so stated | K52.3 | Indeterminate colitis | |
| ischemic | K55.9 | Vascular disorder of intestine, unspecified | |
| left sided | K51.50 | Left sided colitis without complications | |
| lymphocytic | K52.832 | Lymphocytic colitis | |
| microscopic | K52.839 | Microscopic colitis, unspecified | |
| noninfective | K52.9 | Noninfective gastroenteritis and colitis, unspecified | |
| protozoal | A07.9 | Protozoal intestinal disease, unspecified | |
| spastic | K58.9 | Irritable bowel syndrome, unspecified | |
| staphylococcal | A04.8 | Other specified bacterial intestinal infections | |
| subacute ischemic | K55.039 | Acute (reversible) ischemia of large intestine, extent unspecified | |
| thromboulcerative | K55.039 | Acute (reversible) ischemia of large intestine, extent unspecified | |
| toxic NEC | K52.1 | Toxic gastroenteritis and colitis | |
| trichomonal | A07.8 | Other specified protozoal intestinal diseases | |
| tuberculous | A18.32 | Tuberculous enteritis | |
| ulcerative | K51.90 | Ulcerative colitis, unspecified, without complications |
Colitis amebic
| nondysenteric | A06.2 | Amebic nondysenteric colitis |
Colitis Clostridioides difficile
Colitis Clostridium difficile
Colitis ischemic
Colitis membranous
| psychogenic | F54 | Psychological and behavioral factors associated with disorders or diseases classified elsewhere |
Colitis microscopic
| specified NEC | K52.838 | Other microscopic colitis |
Colitis mucous
| psychogenic | F54 | Psychological and behavioral factors associated with disorders or diseases classified elsewhere |
Colitis noninfective
| specified NEC | K52.89 | Other specified noninfective gastroenteritis and colitis |
Colitis pseudomembranous
Colitis regional
| infectious | A09 | Infectious gastroenteritis and colitis, unspecified |
Colitis spastic
Colitis staphylococcal
| foodborne | A05.0 | Foodborne staphylococcal intoxication |
Colitis ulcerative
| psychogenic | F54 | Psychological and behavioral factors associated with disorders or diseases classified elsewhere | |
| specified type NEC | K51.80 | Other ulcerative colitis without complications | |
| with › complication | K51.919 | Ulcerative colitis, unspecified with unspecified complications | |
| with › complication › abscess | K51.914 | Ulcerative colitis, unspecified with abscess | |
| with › complication › fistula | K51.913 | Ulcerative colitis, unspecified with fistula | |
| with › complication › obstruction | K51.912 | Ulcerative colitis, unspecified with intestinal obstruction | |
| with › complication › rectal bleeding | K51.911 | Ulcerative colitis, unspecified with rectal bleeding | |
| with › complication › specified complication NEC | K51.918 | Ulcerative colitis, unspecified with other complication | |
| specified type NEC › with › complication | K51.819 | Other ulcerative colitis with unspecified complications | |
| specified type NEC › with › complication › abscess | K51.814 | Other ulcerative colitis with abscess | |
| specified type NEC › with › complication › fistula | K51.813 | Other ulcerative colitis with fistula | |
| specified type NEC › with › complication › obstruction | K51.812 | Other ulcerative colitis with intestinal obstruction | |
| specified type NEC › with › complication › rectal bleeding | K51.811 | Other ulcerative colitis with rectal bleeding | |
| specified type NEC › with › complication › specified complication NEC | K51.818 | Other ulcerative colitis with other complication |
Colitis allergic
Colitis left sided
| with › abscess | K51.514 | Left sided colitis with abscess | |
| with › complication | K51.519 | Left sided colitis with unspecified complications | |
| with › fistula | K51.513 | Left sided colitis with fistula | |
| with › obstruction | K51.512 | Left sided colitis with intestinal obstruction | |
| with › rectal bleeding | K51.511 | Left sided colitis with rectal bleeding | |
| with › complication › specified NEC | K51.518 | Left sided colitis with other complication |
Colitis toxic NEC
| due to › Clostridioides difficile › not specified as recurrent | A04.72 | Enterocolitis due to Clostridium difficile, not specified as recurrent | |
| due to › Clostridioides difficile › recurrent | A04.71 | Enterocolitis due to Clostridium difficile, recurrent | |
| due to › Clostridium difficile › not specified as recurrent | A04.72 | Enterocolitis due to Clostridium difficile, not specified as recurrent | |
| due to › Clostridium difficile › recurrent | A04.71 | Enterocolitis due to Clostridium difficile, recurrent |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources