ICD-10 Code for Colitis

The default ICD-10-CM 2027 code for colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) is K52.9 – Noninfective gastroenteritis and colitis, unspecified. More specific codes depend on the details documented, as listed in the official index (54 codes, 54 billable).

Main code: K52.9 – Noninfective gastroenteritis and colitis, unspecified
Billable: Yes
See also: Enteritis

Index entries for Colitis

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

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.