ICD-10 Code for Diarrhea

The default ICD-10-CM 2027 code for diarrhea, diarrheal (disease) (infantile) (inflammatory) is R19.7 – Diarrhea, unspecified. More specific codes depend on the details documented, as listed in the official index (46 codes, 46 billable).

Main code: R19.7 – Diarrhea, unspecified
Billable: Yes

Index entries for Diarrhea

with
- melena – K92.1
achlorhydric – K31.83
allergic – K52.29
- due to
  - colitis – see Colitis, allergic
  - enteritis – see Enteritis, allergic
amebic – A06.0 – see also Amebiasis
- with abscess – see Abscess, amebic
- acute – A06.0
- chronic – A06.1
- nondysenteric – A06.2
bacillary – see Dysentery, bacillary
balantidial – A07.0
cachectic NEC – K52.89
Chilomastix – A07.8
choleriformis – A00.1
chronic (noninfectious) – K52.9
coccidial – A07.3
Cochin-China – K90.1
- strongyloidiasis – B78.0
Dientamoeba – A07.8
dietetic – K52.29 – see also Diarrhea, allergic
drug-induced – K52.1
due to
- bacteria – A04.9
  - specified NEC – A04.8
- Campylobacter – A04.5
- Capillaria philippinensis – B81.1
- Clostridium difficile
  - not specified as recurrent – A04.72
  - recurrent – A04.71
- Clostridium perfringens (C) (F) – A04.8
- Cryptosporidium – A07.2
- drugs – K52.1
- Escherichia coli – A04.4
  - enteroaggregative – A04.4
  - enterohemorrhagic – A04.3
  - enteroinvasive – A04.2
  - enteropathogenic – A04.0
  - enterotoxigenic – A04.1
  - specified NEC – A04.4
- food hypersensitivity – K52.29 – see also Diarrhea, allergic
- Necator americanus – B76.1
- S. japonicum – B65.2
- specified organism NEC – A08.8
  - bacterial – A04.8
  - viral – A08.39
- Staphylococcus – A04.8
- Trichuris trichiuria – B79
- virus – see Enteritis, viral
- Yersinia enterocolitica – A04.6
dysenteric – A09
endemic – A09
epidemic – A09
flagellate – A07.9
Flexner's (ulcerative) – A03.1
functional – K59.1
- following gastrointestinal surgery – K91.89
- psychogenic – F45.8
Giardia lamblia – A07.1
giardial – A07.1
hill – K90.1
infectious – A09
malarial – see Malaria
mite – B88.09
mycotic NEC – B49
neonatal (noninfectious) – P78.3
nervous – F45.8
neurogenic – K59.1
noninfectious – K52.9
postgastrectomy – K91.1
postvagotomy – K91.1
protozoal – A07.9
- specified NEC – A07.8
psychogenic – F45.8
specified
- bacterium NEC – A04.8
- virus NEC – A08.39
strongyloidiasis – B78.0
toxic – K52.1
trichomonal – A07.8
tropical – K90.1
tuberculous – A18.32
viral – see Enteritis, viral

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.