A09

Billable

ChapterA00–B99

Rankcategory

Official Description

Infectious gastroenteritis and colitis, unspecified

Metadata & Insights

•Billable/specific code (valid for reimbursement).
•Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

CH1 Parent Instructions

Includes

diseases generally recognized as communicable or transmissible

Excludes1(Not coded here. Use a different code.)

certain localized infections - see body system-related chapters

Excludes2(Not included here. Code separately if applicable.)

carrier or suspected carrier of infectious disease (Z22.-)
infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
infectious and parasitic diseases specific to the perinatal period (P35-P39)
influenza and other acute respiratory infections (J00-J22)

Use Additional Code

code to identify resistance to antimicrobial drugs (Z16.-)

Instructional Notes

Includes

Infectious colitis NOS
Infectious enteritis NOS
Infectious gastroenteritis NOS

Excludes1(Not coded here. Use a different code.)

colitis NOS (K52.9)
diarrhea NOS (R19.7)
enteritis NOS (K52.9)
gastroenteritis NOS (K52.9)
noninfective gastroenteritis and colitis, unspecified (K52.9)

Clinical Hierarchy

BillableHas subcodes

CH1Certain infectious and parasitic diseases (A00-B99)

A00-A09Intestinal infectious diseases (A00-A09)

A09Infectious gastroenteritis and colitis, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A09:

chapterCH1

Certain infectious and parasitic diseases (A00-B99)

View context instructions

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC

Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC

Cross Reference

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