ICD-10 Code for Diarrhea
Also indexed as (disease) (infantile) (inflammatory)
The ICD-10-CM code for diarrhea is R19.7 — Diarrhea, unspecified. This is the code the Alphabetic Index gives for diarrhea with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
BillableUnspecified
R19.7 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which diarrhea code should you use?
The Alphabetic Index lists 46 codes under Diarrhea, diarrheal. 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
| achlorhydric | K31.83 | Achlorhydria | |
| allergic | K52.29 | Other allergic and dietetic gastroenteritis and colitis | |
| amebic | A06.0 | Acute amebic dysentery | |
| balantidial | A07.0 | Balantidiasis | |
| cachectic NEC | K52.89 | Other specified noninfective gastroenteritis and colitis | |
| Chilomastix | A07.8 | Other specified protozoal intestinal diseases | |
| choleriformis | A00.1 | Cholera due to Vibrio cholerae 01, biovar eltor | |
| chronic | K52.9 | Noninfective gastroenteritis and colitis, unspecified | |
| coccidial | A07.3 | Isosporiasis | |
| Cochin-China | K90.1 | Tropical sprue | |
| Dientamoeba | A07.8 | Other specified protozoal intestinal diseases | |
| dietetic | K52.29 | Other allergic and dietetic gastroenteritis and colitis | |
| drug-induced | K52.1 | Toxic gastroenteritis and colitis | |
| dysenteric | A09 | Infectious gastroenteritis and colitis, unspecified | |
| endemic | A09 | Infectious gastroenteritis and colitis, unspecified | |
| epidemic | A09 | Infectious gastroenteritis and colitis, unspecified | |
| flagellate | A07.9 | Protozoal intestinal disease, unspecified | |
| Flexner's | A03.1 | Shigellosis due to Shigella flexneri | |
| functional | K59.1 | Functional diarrhea | |
| Giardia lamblia | A07.1 | Giardiasis [lambliasis] | |
| giardial | A07.1 | Giardiasis [lambliasis] | |
| hill | K90.1 | Tropical sprue | |
| infectious | A09 | Infectious gastroenteritis and colitis, unspecified | |
| mite | B88.09 | Other acariasis | |
| mycotic NEC | B49 | Unspecified mycosis | |
| neonatal | P78.3 | Noninfective neonatal diarrhea | |
| nervous | F45.8 | Other somatoform disorders | |
| neurogenic | K59.1 | Functional diarrhea | |
| noninfectious | K52.9 | Noninfective gastroenteritis and colitis, unspecified | |
| postgastrectomy | K91.1 | Postgastric surgery syndromes | |
| postvagotomy | K91.1 | Postgastric surgery syndromes | |
| protozoal | A07.9 | Protozoal intestinal disease, unspecified | |
| psychogenic | F45.8 | Other somatoform disorders | |
| strongyloidiasis | B78.0 | Intestinal strongyloidiasis | |
| toxic | K52.1 | Toxic gastroenteritis and colitis | |
| trichomonal | A07.8 | Other specified protozoal intestinal diseases | |
| tropical | K90.1 | Tropical sprue | |
| tuberculous | A18.32 | Tuberculous enteritis |
Diarrhea with
| melena | K92.1 | Melena |
Diarrhea amebic
Diarrhea Cochin-China
| strongyloidiasis | B78.0 | Intestinal strongyloidiasis |
Diarrhea due to
| bacteria | A04.9 | Bacterial intestinal infection, unspecified | |
| Campylobacter | A04.5 | Campylobacter enteritis | |
| Capillaria philippinensis | B81.1 | Intestinal capillariasis | |
| Clostridium perfringens | A04.8 | Other specified bacterial intestinal infections | |
| Cryptosporidium | A07.2 | Cryptosporidiosis | |
| drugs | K52.1 | Toxic gastroenteritis and colitis | |
| Escherichia coli | A04.4 | Other intestinal Escherichia coli infections | |
| food hypersensitivity | K52.29 | Other allergic and dietetic gastroenteritis and colitis | |
| Necator americanus | B76.1 | Necatoriasis | |
| S. japonicum | B65.2 | Schistosomiasis due to Schistosoma japonicum | |
| specified organism NEC | A08.8 | Other specified intestinal infections | |
| Staphylococcus | A04.8 | Other specified bacterial intestinal infections | |
| Trichuris trichiuria | B79 | Trichuriasis | |
| Yersinia enterocolitica | A04.6 | Enteritis due to Yersinia enterocolitica | |
| bacteria › specified NEC | A04.8 | Other specified bacterial intestinal infections | |
| Clostridium difficile › not specified as recurrent | A04.72 | Enterocolitis due to Clostridium difficile, not specified as recurrent | |
| Clostridium difficile › recurrent | A04.71 | Enterocolitis due to Clostridium difficile, recurrent | |
| Escherichia coli › enteroaggregative | A04.4 | Other intestinal Escherichia coli infections | |
| Escherichia coli › enterohemorrhagic | A04.3 | Enterohemorrhagic Escherichia coli infection | |
| Escherichia coli › enteroinvasive | A04.2 | Enteroinvasive Escherichia coli infection | |
| Escherichia coli › enteropathogenic | A04.0 | Enteropathogenic Escherichia coli infection | |
| Escherichia coli › enterotoxigenic | A04.1 | Enterotoxigenic Escherichia coli infection | |
| Escherichia coli › specified NEC | A04.4 | Other intestinal Escherichia coli infections | |
| specified organism NEC › bacterial | A04.8 | Other specified bacterial intestinal infections | |
| specified organism NEC › viral | A08.39 | Other viral enteritis |
Diarrhea functional
Diarrhea protozoal
| specified NEC | A07.8 | Other specified protozoal intestinal diseases |
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