Certain zoonotic bacterial diseases
57 codes in this section
About Section A20-A28
Section A20-A28 (A20-A28) covers certain zoonotic bacterial diseases. It sits within the Certain infectious and parasitic diseases chapter (A00-B99). This section contains 57 ICD-10-CM codes, 47 billable diagnoses you can submit on a claim, and 10 non-billable header codes used to organize the hierarchy.
Codes are organized below by 3-character root. Click the root to see all subcodes underneath it, or click any individual code for full coverage data, payer policies, and linked CPT procedures.
Codes in A20-A28
Grouped by 3-character root code. Click any code for full detail.
| A20.0 | Bubonic plague | Billable |
| A20.1 | Cellulocutaneous plague | Billable |
| A20.2 | Pneumonic plague | Billable |
| A20.3 | Plague meningitis | Billable |
| A20.7 | Septicemic plague | Billable |
| A20.8 | Other forms of plague | Billable |
| A20.9 | Plague, unspecified | Billable |
| A21.0 | Ulceroglandular tularemia | Billable |
| A21.1 | Oculoglandular tularemia | Billable |
| A21.2 | Pulmonary tularemia | Billable |
| A21.3 | Gastrointestinal tularemia | Billable |
| A21.7 | Generalized tularemia | Billable |
| A21.8 | Other forms of tularemia | Billable |
| A21.9 | Tularemia, unspecified | Billable |
| A22.0 | Cutaneous anthrax | Billable |
| A22.1 | Pulmonary anthrax | Billable |
| A22.2 | Gastrointestinal anthrax | Billable |
| A22.7 | Anthrax sepsis | Billable |
| A22.8 | Other forms of anthrax | Billable |
| A22.9 | Anthrax, unspecified | Billable |
| A23.0 | Brucellosis due to Brucella melitensis | Billable |
| A23.1 | Brucellosis due to Brucella abortus | Billable |
| A23.2 | Brucellosis due to Brucella suis | Billable |
| A23.3 | Brucellosis due to Brucella canis | Billable |
| A23.8 | Other brucellosis | Billable |
| A23.9 | Brucellosis, unspecified | Billable |
| A24.0 | Glanders | Billable |
| A24.1 | Acute and fulminating melioidosis | Billable |
| A24.2 | Subacute and chronic melioidosis | Billable |
| A24.3 | Other melioidosis | Billable |
| A24.9 | Melioidosis, unspecified | Billable |
| A25.0 | Spirillosis | Billable |
| A25.1 | Streptobacillosis | Billable |
| A25.9 | Rat-bite fever, unspecified | Billable |
| A26.0 | Cutaneous erysipeloid | Billable |
| A26.7 | Erysipelothrix sepsis | Billable |
| A26.8 | Other forms of erysipeloid | Billable |
| A26.9 | Erysipeloid, unspecified | Billable |
| A27.0 | Leptospirosis icterohemorrhagica | Billable |
| A27.8 | Other forms of leptospirosis | Header |
| A27.81 | Aseptic meningitis in leptospirosis | Billable |
| A27.89 | Other forms of leptospirosis | Billable |
| A27.9 | Leptospirosis, unspecified | Billable |
| A28.0 | Pasteurellosis | Billable |
| A28.1 | Cat-scratch disease | Billable |
| A28.2 | Extraintestinal yersiniosis | Billable |
| A28.8 | Other specified zoonotic bacterial diseases, not elsewhere classified | Billable |
| A28.9 | Zoonotic bacterial disease, unspecified | Billable |
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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