Certain zoonotic bacterial diseases (A20-A28) ICD-10-CM
The A20–A28 section covers certain zoonotic bacterial diseases with 57 ICD-10-CM diagnosis codes, of which 47 are billable in fiscal year 2026. The section is organized into the 9 code ranges listed below.
Code Ranges in This Section 9 ranges · 57 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the A20–A28 Code Range
ICD-10 codes A20-A28 cover a group of bacterial infections transmitted from animals to humans, known as zoonotic bacterial diseases. These codes help identify specific infections like plague, tularemia, anthrax, brucellosis, and others caused by different bacteria.
This range includes various forms and complications of these diseases, often detailed by the type or site of infection. For example, A20.x codes are used for different types of plague, including bubonic, pneumonic, and septicemic plague. If you see terms like bubonic plague or simply plague, they correspond to these codes. Tularemia, also called Francisella infection, is coded under A21.x with distinctions for ulceroglandular, oculoglandular, and pulmonary forms. Anthrax, identified by terms like cutaneous anthrax or inhalational anthrax, is classified under A22.x. Similarly, brucellosis caused by different Brucella species, glanders, melioidosis, rat-bite fevers, erysipeloid, leptospirosis (including Weil's disease), and other bacterial zoonoses each have dedicated codes that assist medical professionals in accurate diagnosis and treatment documentation.
Questions About This Page
How many codes are in the A20-A28 range?
The A20-A28 range contains 57 ICD-10-CM diagnosis codes in FY 2026. 47 of them are billable, and the rest are category headers that organize the section.
What conditions does A20-A28 cover?
The range covers certain zoonotic bacterial diseases. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
