ICD-10-CM 2027
ICD-10 code for colitis
From the official ICD-10-CM alphabetic index entry “Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic)”. Page updated September 29, 2026.
About coding colitis
The ICD-10-CM code for colitis is K52.9 (Noninfective gastroenteritis and colitis, unspecified). The official index lists 74 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on K52.9.
Within K52, choose K52.9 (Noninfective gastroenteritis and colitis, unspecified) only when documentation doesn't support a more specific option: gastroenteritis and colitis due to radiation (K52.0), toxic gastroenteritis and colitis (K52.1), allergic and dietetic gastroenteritis and colitis (K52.2), indeterminate colitis (K52.3) and other specified noninfective gastroenteritis and colitis (K52.8).
Don't report K52.9 together with the conditions in its Excludes1 note: diarrhea NOS (R19.7), functional diarrhea (K59.1), infectious gastroenteritis and colitis NOS (A09), neonatal diarrhea (noninfective) (P78.3) and 1 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific colitis codes (official index)
- allergic K52.29 — Other allergic and dietetic gastroenteritis and colitis
- with
- food protein-induced enterocolitis syndrome K52.21 — Food protein-induced enterocolitis syndrome
- proctocolitis K52.29 — Other allergic and dietetic gastroenteritis and colitis
- amebic (acute) A06.0 — Acute amebic dysentery
- nondysenteric A06.2 — Amebic nondysenteric colitis
- anthrax A22.2 — Gastrointestinal anthrax
- bacillary
- balantidial A07.0 — Balantidiasis
- 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
- 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
- coccidial A07.3 — Isosporiasis
- collagenous K52.831 — Collagenous colitis
- cystica superficialis K52.89 — Other specified noninfective gastroenteritis and colitis
- dietary counseling and surveillance (for) 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]
- granulomatous
- indeterminate, so stated K52.3 — Indeterminate colitis
- infectious
- ischemic K55.9 — Vascular disorder of intestine, unspecified
- acute (subacute) 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 (acute) K55.039 — Acute (reversible) ischemia of large intestine, extent unspecified
- left sided K51.50 — Left sided colitis without complications
- with
- abscess K51.514 — Left sided colitis with abscess
- complication K51.519 — Left sided colitis with unspecified complications
- specified NEC K51.518 — Left sided colitis with other complication
- fistula K51.513 — Left sided colitis with fistula
- obstruction K51.512 — Left sided colitis with intestinal obstruction
- rectal bleeding K51.511 — Left sided colitis with rectal bleeding
- lymphocytic K52.832 — Lymphocytic colitis
- membranous
- psychogenic F54 — Psychological and behavioral factors associated with disorders or diseases classified elsewhere
- microscopic K52.839 — Microscopic colitis, unspecified
- specified NEC K52.838 — Other microscopic colitis
- mucous
- psychogenic F54 — Psychological and behavioral factors associated with disorders or diseases classified elsewhere
- noninfective K52.9 — Noninfective gastroenteritis and colitis, unspecified
- specified NEC K52.89 — Other specified noninfective gastroenteritis and colitis
- polyposa
- protozoal A07.9 — Protozoal intestinal disease, unspecified
- 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
- pseudomucinous
- regional
- infectious A09 — Infectious gastroenteritis and colitis, unspecified
- segmental
- septic
- spastic K58.9 — Irritable bowel syndrome, unspecified
- with diarrhea K58.0 — Irritable bowel syndrome with diarrhea
- psychogenic F54 — Psychological and behavioral factors associated with disorders or diseases classified elsewhere
- staphylococcal A04.8 — Other specified bacterial intestinal infections
- foodborne A05.0 — Foodborne staphylococcal intoxication
- 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
- due to
- 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
- 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
- transmural
- trichomonal A07.8 — Other specified protozoal intestinal diseases
- tuberculous (ulcerative) A18.32 — Tuberculous enteritis
- ulcerative (chronic) K51.90 — Ulcerative colitis, unspecified, without complications
- with
- complication K51.919 — Ulcerative colitis, unspecified with unspecified complications
- abscess K51.914 — Ulcerative colitis, unspecified with abscess
- fistula K51.913 — Ulcerative colitis, unspecified with fistula
- obstruction K51.912 — Ulcerative colitis, unspecified with intestinal obstruction
- rectal bleeding K51.911 — Ulcerative colitis, unspecified with rectal bleeding
- specified complication NEC K51.918 — Ulcerative colitis, unspecified with other complication
- enterocolitis
- ileocolitis
- mucosal proctocolitis
- proctitis
- pseudopolyposis
- psychogenic F54 — Psychological and behavioral factors associated with disorders or diseases classified elsewhere
- rectosigmoiditis
- specified type NEC K51.80 — Other ulcerative colitis without complications
- with
- complication K51.819 — Other ulcerative colitis with unspecified complications
- abscess K51.814 — Other ulcerative colitis with abscess
- fistula K51.813 — Other ulcerative colitis with fistula
- obstruction K51.812 — Other ulcerative colitis with intestinal obstruction
- rectal bleeding K51.811 — Other ulcerative colitis with rectal bleeding
- specified complication NEC K51.818 — Other ulcerative colitis with other complication
Don't confuse with (Excludes1 for K52.9)
Common questions about colitis ICD-10 codes
What is the ICD-10 code for colitis?
- K52.9 — Noninfective gastroenteritis and colitis, unspecified. More specific codes apply when the documentation supports them: K52.29, K52.21, K52.29, A06.0 and others below.
What is the ICD-10 code for allergic colitis?
- K52.29 — Other allergic and dietetic gastroenteritis and colitis.
What is the ICD-10 code for amebic colitis?
- A06.0 — Acute amebic dysentery.
What is the ICD-10 code for anthrax colitis?
- A22.2 — Gastrointestinal anthrax.
What is the ICD-10 code for balantidial colitis?
- A07.0 — Balantidiasis.
What is the ICD-10 code for coccidial colitis?
- A07.3 — Isosporiasis.
What is the ICD-10 code for collagenous colitis?
- K52.831 — Collagenous colitis.
Is K52.9 billable?
- Yes. K52.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K52.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K52.9 as a principal diagnosis.
Is K52.9 a CC or MCC?
- No. K52.9 is neither a CC nor an MCC under MS-DRG v44.0.