A20-A28

Non-Billable
ChapterA00–B99
Rankblock
Official Description

Certain zoonotic bacterial diseases (A20-A28)

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)
A20-A28Certain zoonotic bacterial diseases (A20-A28)
A20Plague
A21Tularemia
A22Anthrax
A23Brucellosis
A24Glanders and melioidosis
A25Rat-bite fevers
A26Erysipeloid
A27Leptospirosis
A28Other zoonotic bacterial diseases, not elsewhere classified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A20-A28:

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

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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