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

not specified as recurrent	A04.72	Enterocolitis due to Clostridium difficile, not specified as recurrent
recurrent	A04.71	Enterocolitis due to Clostridium difficile, recurrent

Colitis Clostridium difficile

not specified as recurrent	A04.72	Enterocolitis due to Clostridium difficile, not specified as recurrent
recurrent	A04.71	Enterocolitis due to Clostridium difficile, recurrent

Colitis ischemic

acute	K55.039	Acute (reversible) ischemia of large intestine, extent unspecified
chronic	K55.1	Chronic vascular disorders of intestine
due to mesenteric artery insufficiency	K55.1	Chronic vascular disorders of intestine
fulminant	K55.039	Acute (reversible) ischemia of large intestine, extent unspecified

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

not specified as recurrent	A04.72	Enterocolitis due to Clostridium difficile, not specified as recurrent
recurrent	A04.71	Enterocolitis due to Clostridium difficile, recurrent

Colitis regional

infectious

A09

Infectious gastroenteritis and colitis, unspecified

Colitis spastic

with diarrhea	K58.0	Irritable bowel syndrome with diarrhea
psychogenic	F54	Psychological and behavioral factors associated with disorders or diseases classified elsewhere

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

with › food protein-induced enterocolitis syndrome	K52.21	Food protein-induced enterocolitis syndrome
with › proctocolitis	K52.29	Other allergic and dietetic gastroenteritis and colitis

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