A09 Infectious gastroenteritis and colitis, unspecified
The ICD-10-CM code for Infectious gastroenteritis and colitis, unspecified is A09 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- A00-A09: Intestinal infectious diseases (A00-A09)
- Category A09
- 1 code (1 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to A09:
- Dysentery, dysenteric (catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical)
- Diarrhea, diarrheal (disease) (infantile) (inflammatory) › epidemic
- Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) › epidemic (infectious)
- Disease, diseased › diarrheal, infectious NEC
- Diarrhea, diarrheal (disease) (infantile) (inflammatory) › dysenteric
- Diarrhea, diarrheal (disease) (infantile) (inflammatory) › endemic
- Dysentery, dysenteric (catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical) › arthritis
- Diarrhea, diarrheal (disease) (infantile) (inflammatory) › infectious
Inclusion Terms
- Infectious colitis NOS
- Infectious enteritis NOS
- Infectious gastroenteritis NOS
U.S. Hospital Utilization
- An estimated 58,745 U.S. inpatient stays in 2023 included A09 among the documented diagnoses.
- 19,940 stays listed it as the principal diagnosis.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Official Coding Guidelines
HIV Infections (TOC entry)a. Human Immunodeficiency Virus (HIV) Infections .............................................................. 19
Infectious agents causing diseases in other chapters (TOC)b. Infectious agents as the cause of diseases classified to other chapters ................................. 22
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026