A09 – Infectious gastroenteritis and colitis, unspecified
ICD-10-CM 2027 diagnosis code · Intestinal infectious diseases
ICD-10-CM code
A09
- Code
A09(claims format:A09)- Description
- Infectious gastroenteritis and colitis, unspecified
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 1. Certain infectious and parasitic diseases (A00-B99)
- Block
- A00-A09 Intestinal infectious diseases
Notes for A09
Applicable to:
- Infectious colitis NOS
- Infectious enteritis NOS
- Infectious gastroenteritis NOS
Index terms for A09
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Enteritis, septic
- Ileitis, infectious
- Enteritis, epidemic
- Dysentery, dysenteric
- Sigmoiditis, infectious
- Ileocolitis, infectious
- Gastroenteritis, epidemic
- Enteritis, infectious NOS
- Diarrhea, diarrheal, endemic
- Colitis, regional, infectious
- Gastroenteropathy, infectious
- Enterocolitis, infectious NEC
- Diarrhea, diarrheal, epidemic
- Diarrhea, diarrheal, infectious
- Diarrhea, diarrheal, dysenteric
- Dysentery, dysenteric, arthritis
- Disease, diseased, diarrheal, infectious NEC
- Arthritis, arthritic, in, enteritis, infectious NEC
- Ulcer, ulcerated, ulcerating, ulceration, ulcerative, dysenteric
Frequently asked questions
What is ICD-10 code A09?
A09 is the ICD-10-CM code for infectious gastroenteritis and colitis, unspecified, in the block A00-A09 (Intestinal infectious diseases).
Is A09 a billable code?
Yes. A09 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.