A00-A09

Non-Billable
ChapterA00–B99
Rankblock
Official Description

Intestinal infectious diseases (A00-A09)

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

CH1 Parent Instructions

Includes
  • diseases generally recognized as communicable or transmissible
Excludes1(Not coded here)
  • certain localized infections - see body system-related chapters
Excludes2(Not included here)
  • 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.-)

Clinical Hierarchy

CH1Certain infectious and parasitic diseases (A00-B99)
A00-A09Intestinal infectious diseases (A00-A09)
A00Cholera
A01Typhoid and paratyphoid fevers
A02Other salmonella infections
A03Shigellosis
A04Other bacterial intestinal infections
A05Other bacterial foodborne intoxications, not elsewhere classified
A06Amebiasis
A07Other protozoal intestinal diseases
A08Viral and other specified intestinal infections
A09Infectious gastroenteritis and colitis, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A00-A09:

chapterCH1
Certain infectious and parasitic diseases (A00-B99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

Find Procedures (ICD-10-PCS)

Find surgical and procedural codes related to Intestinal infectious diseases (A00-A09).

Search PCS Codes