| A20 | Plague |
| A20.0 | Bubonic plague |
| A20.1 | Cellulocutaneous plague |
| A20.2 | Pneumonic plague |
| A20.3 | Plague meningitis |
| A20.7 | Septicemic plague |
| A20.8 | Other forms of plague |
| A20.9 | Plague, unspecified |
| A21 | Tularemia |
| A21.0 | Ulceroglandular tularemia |
| A21.1 | Oculoglandular tularemia |
| A21.2 | Pulmonary tularemia |
| A21.3 | Gastrointestinal tularemia |
| A21.7 | Generalized tularemia |
| A21.8 | Other forms of tularemia |
| A21.9 | Tularemia, unspecified |
| A22 | Anthrax |
| A22.0 | Cutaneous anthrax |
| A22.1 | Pulmonary anthrax |
| A22.2 | Gastrointestinal anthrax |
| A22.7 | Anthrax sepsis |
| A22.8 | Other forms of anthrax |
| A22.9 | Anthrax, unspecified |
| A23 | Brucellosis |
| A23.0 | Brucellosis due to Brucella melitensis |
| A23.1 | Brucellosis due to Brucella abortus |
| A23.2 | Brucellosis due to Brucella suis |
| A23.3 | Brucellosis due to Brucella canis |
| A23.8 | Other brucellosis |
| A23.9 | Brucellosis, unspecified |
| A24 | Glanders and melioidosis |
| A24.0 | Glanders |
| A24.1 | Acute and fulminating melioidosis |
| A24.2 | Subacute and chronic melioidosis |
| A24.3 | Other melioidosis |
| A24.9 | Melioidosis, unspecified |
| A25 | Rat-bite fevers |
| A25.0 | Spirillosis |
| A25.1 | Streptobacillosis |
| A25.9 | Rat-bite fever, unspecified |
| A26 | Erysipeloid |
| A26.0 | Cutaneous erysipeloid |
| A26.7 | Erysipelothrix sepsis |
| A26.8 | Other forms of erysipeloid |
| A26.9 | Erysipeloid, unspecified |
| A27 | Leptospirosis |
| A27.0 | Leptospirosis icterohemorrhagica |
| A27.8 | Other forms of leptospirosis |
| A27.81 | Aseptic meningitis in leptospirosis |
| A27.89 | Other forms of leptospirosis |
| A27.9 | Leptospirosis, unspecified |
| A28 | Other zoonotic bacterial diseases, not elsewhere classified |
| A28.0 | Pasteurellosis |
| A28.1 | Cat-scratch disease |
| A28.2 | Extraintestinal yersiniosis |
| A28.8 | Other specified zoonotic bacterial diseases, not elsewhere classified |
| A28.9 | Zoonotic bacterial disease, unspecified |