All ICD10 Codes

A20-A28

Non-Billable
ChapterA00–B99
Rankblock
Official Description

Certain zoonotic bacterial diseases (A20-A28)

Use a more specific code (0 billable, 9 non-billable)
A20Plaguehas subcodesA21Tularemiahas subcodesA22Anthraxhas subcodesA23Brucellosishas subcodesA24Glanders and melioidosishas subcodesA25Rat-bite fevershas subcodesA26Erysipeloidhas subcodesA27Leptospirosishas subcodesA28Other zoonotic bacterial diseases, not elsewhere classifiedhas subcodes
Metadata & Insights
  • •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. 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.-)

Clinical Hierarchy

BillableHas subcodes
CH1Certain infectious and parasitic diseases (A00-B99)
A20-A28Certain zoonotic bacterial diseases (A20-A28)Not billable
A20PlagueSubcodes
A21TularemiaSubcodes
A22AnthraxSubcodes
A23BrucellosisSubcodes
A24Glanders and melioidosisSubcodes
A25Rat-bite feversSubcodes
A26ErysipeloidSubcodes
A27LeptospirosisSubcodes
A28Other zoonotic bacterial diseases, not elsewhere classifiedSubcodes

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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