ICD-10-CM 2027
ICD-10 code for dysentery
Infectious gastroenteritis and colitis, unspecified
From the official ICD-10-CM alphabetic index entry “Dysentery, dysenteric (catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical)”. Page updated September 29, 2026.
About coding dysentery
The ICD-10-CM code for dysentery is A09 (Infectious gastroenteritis and colitis, unspecified). The official index lists 50 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on A09.
Don't report A09 together with the conditions in its Excludes1 note: colitis NOS (K52.9), diarrhea NOS (R19.7), enteritis NOS (K52.9), gastroenteritis NOS (K52.9) and 1 more.
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC, relative weight 1.2392) and DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC, relative weight 0.7645), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific dysentery codes (official index)
- abscess, liver A06.4 — Amebic liver abscess
- amebic A06.0 — Acute amebic dysentery
- with abscess
- acute A06.0 — Acute amebic dysentery
- chronic A06.1 — Chronic intestinal amebiasis
- arthritis A09 — Infectious gastroenteritis and colitis, unspecified
- bacillary A03.9 — Shigellosis, unspecified
- bacillary A03.9 — Shigellosis, unspecified
- arthritis A03.9 — Shigellosis, unspecified
- Boyd A03.2 — Shigellosis due to Shigella boydii
- Flexner A03.1 — Shigellosis due to Shigella flexneri
- Schmitz (-Stutzer) A03.0 — Shigellosis due to Shigella dysenteriae
- Shiga (-Kruse) A03.0 — Shigellosis due to Shigella dysenteriae
- Shigella A03.9 — Shigellosis, unspecified
- boydii A03.2 — Shigellosis due to Shigella boydii
- dysenteriae A03.0 — Shigellosis due to Shigella dysenteriae
- flexneri A03.1 — Shigellosis due to Shigella flexneri
- group A A03.0 — Shigellosis due to Shigella dysenteriae
- group B A03.1 — Shigellosis due to Shigella flexneri
- group C A03.2 — Shigellosis due to Shigella boydii
- group D A03.3 — Shigellosis due to Shigella sonnei
- sonnei A03.3 — Shigellosis due to Shigella sonnei
- specified type NEC A03.8 — Other shigellosis
- Sonne A03.3 — Shigellosis due to Shigella sonnei
- specified type NEC A03.8 — Other shigellosis
- balantidial A07.0 — Balantidiasis
- Balantidium coli A07.0 — Balantidiasis
- Boyd's A03.2 — Shigellosis due to Shigella boydii
- candidal B37.82 — Candidal enteritis
- Chilomastix A07.8 — Other specified protozoal intestinal diseases
- Chinese A03.9 — Shigellosis, unspecified
- coccidial A07.3 — Isosporiasis
- Dientamoeba (fragilis) A07.8 — Other specified protozoal intestinal diseases
- Embadomonas A07.8 — Other specified protozoal intestinal diseases
- Entamoeba, entamebic
- Flexner-Boyd A03.2 — Shigellosis due to Shigella boydii
- Flexner's A03.1 — Shigellosis due to Shigella flexneri
- Giardia lamblia A07.1 — Giardiasis [lambliasis]
- Hiss-Russell A03.1 — Shigellosis due to Shigella flexneri
- Lamblia A07.1 — Giardiasis [lambliasis]
- leishmanial B55.0 — Visceral leishmaniasis
- malarial
- metazoal B82.0 — Intestinal helminthiasis, unspecified
- monilial B37.82 — Candidal enteritis
- protozoal A07.9 — Protozoal intestinal disease, unspecified
- Salmonella A02.0 — Salmonella enteritis
- schistosomal B65.1 — Schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis]
- Schmitz (-Stutzer) A03.0 — Shigellosis due to Shigella dysenteriae
- Shiga (-Kruse) A03.0 — Shigellosis due to Shigella dysenteriae
- Shigella NOS
- Sonne A03.3 — Shigellosis due to Shigella sonnei
- strongyloidiasis B78.0 — Intestinal strongyloidiasis
- trichomonal A07.8 — Other specified protozoal intestinal diseases
- viral A08.4 — Viral intestinal infection, unspecified
Don't confuse with (Excludes1 for A09)
Common questions about dysentery ICD-10 codes
What is the ICD-10 code for dysentery?
- A09 — Infectious gastroenteritis and colitis, unspecified. More specific codes apply when the documentation supports them: A06.4, A06.0, A06.0, A06.1 and others below.
What is the ICD-10 code for amebic dysentery?
- A06.0 — Acute amebic dysentery.
What is the ICD-10 code for arthritis dysentery?
- A09 — Infectious gastroenteritis and colitis, unspecified.
What is the ICD-10 code for bacillary dysentery?
- A03.9 — Shigellosis, unspecified.
What is the ICD-10 code for balantidial dysentery?
- A07.0 — Balantidiasis.
What is the ICD-10 code for balantidium coli dysentery?
- A07.0 — Balantidiasis.
What is the ICD-10 code for boyd's dysentery?
- A03.2 — Shigellosis due to Shigella boydii.
Is A09 billable?
- Yes. A09 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A09 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A09 as a principal diagnosis.
Is A09 a CC or MCC?
- A09 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.