Billable / Specific Code
ICD-10-CM A09 is the diagnosis code for Infectious gastroenteritis and colitis, unspecified. This code falls under the section "Intestinal infectious diseases" within Chapter 1 — Certain infectious and parasitic diseases (A00-B99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as A09. They are mutually exclusive:
Understanding where A09 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, A09 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
A09 is the ICD-10-CM diagnosis code for "Infectious gastroenteritis and colitis, unspecified". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
A09 is located in Section A00-A09 — "Intestinal infectious diseases" within Chapter 1 of the ICD-10-CM Tabular List.
Use A09 when the patients documented diagnosis matches "Infectious gastroenteritis and colitis, unspecified" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Infectious gastroenteritis and colitis, unspecified is A09.
Yes, A09 can be used as a primary diagnosis code since it is billable and specific.
A09 is in Chapter 1 of the ICD-10-CM Tabular List.
Type 1 Excludes for A09 include: colitis NOS (K52.9); diarrhea NOS (R19.7); enteritis NOS (K52.9) and more.
Yes, A09 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.