Infectious gastroenteritis and colitis, unspecified (A09) ICD-10-CM
The A09 code range covers infectious gastroenteritis and colitis, unspecified with 1 ICD-10-CM diagnosis codes. 1 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
- Infectious colitis NOS
- Infectious enteritis NOS
- Infectious gastroenteritis NOS
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the A09 Range 1 codes · 1 billable
- A09 Infectious gastroenteritis and colitis, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the A09 range.
Dysentery
Acute inflammation of the intestine associated with infectious DIARRHEA of various etiologies, generally acquired by eating contaminated food containing TOXINS, BIOLOGICAL derived from BACTERIA or other microorganisms. Dysentery is characterized initially by watery FECES then by bloody mucoid stools. It is often associated with ABDOMINAL PAIN; FEVER; and DEHYDRATION.
About the A09 Code Range
Gastroenteritis is inflammation of the stomach and intestines; colitis is inflammation of the colon. Here, both are infectious.
Within intestinal infectious diseases, A09 groups infectious gastroenteritis and colitis under an unspecified category.
Questions About This Page
How many billable codes are in the A09 range?
Of the 1 codes in this range, 1 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the A09 range classify?
The range classifies infectious gastroenteritis and colitis, unspecified. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
