| A30 | Leprosy [Hansen's disease] |
| A30.0 | Indeterminate leprosy |
| A30.1 | Tuberculoid leprosy |
| A30.2 | Borderline tuberculoid leprosy |
| A30.3 | Borderline leprosy |
| A30.4 | Borderline lepromatous leprosy |
| A30.5 | Lepromatous leprosy |
| A30.8 | Other forms of leprosy |
| A30.9 | Leprosy, unspecified |
| A31 | Infection due to other mycobacteria |
| A31.0 | Pulmonary mycobacterial infection |
| A31.1 | Cutaneous mycobacterial infection |
| A31.2 | Disseminated mycobacterium avium-intracellulare complex (DMAC) |
| A31.8 | Other mycobacterial infections |
| A31.9 | Mycobacterial infection, unspecified |
| A32 | Listeriosis |
| A32.0 | Cutaneous listeriosis |
| A32.1 | Listerial meningitis and meningoencephalitis |
| A32.11 | Listerial meningitis |
| A32.12 | Listerial meningoencephalitis |
| A32.7 | Listerial sepsis |
| A32.8 | Other forms of listeriosis |
| A32.81 | Oculoglandular listeriosis |
| A32.82 | Listerial endocarditis |
| A32.89 | Other forms of listeriosis |
| A32.9 | Listeriosis, unspecified |
| A33 | Tetanus neonatorum |
| A34 | Obstetrical tetanus |
| A35 | Other tetanus |
| A36 | Diphtheria |
| A36.0 | Pharyngeal diphtheria |
| A36.1 | Nasopharyngeal diphtheria |
| A36.2 | Laryngeal diphtheria |
| A36.3 | Cutaneous diphtheria |
| A36.8 | Other diphtheria |
| A36.81 | Diphtheritic cardiomyopathy |
| A36.82 | Diphtheritic radiculomyelitis |
| A36.83 | Diphtheritic polyneuritis |
| A36.84 | Diphtheritic tubulo-interstitial nephropathy |
| A36.85 | Diphtheritic cystitis |
| A36.86 | Diphtheritic conjunctivitis |
| A36.89 | Other diphtheritic complications |
| A36.9 | Diphtheria, unspecified |
| A37 | Whooping cough |
| A37.0 | Whooping cough due to Bordetella pertussis |
| A37.00 | Whooping cough due to Bordetella pertussis without pneumonia |
| A37.01 | Whooping cough due to Bordetella pertussis with pneumonia |
| A37.1 | Whooping cough due to Bordetella parapertussis |
| A37.10 | Whooping cough due to Bordetella parapertussis without pneumonia |
| A37.11 | Whooping cough due to Bordetella parapertussis with pneumonia |
| A37.8 | Whooping cough due to other Bordetella species |
| A37.80 | Whooping cough due to other Bordetella species without pneumonia |
| A37.81 | Whooping cough due to other Bordetella species with pneumonia |
| A37.9 | Whooping cough, unspecified species |
| A37.90 | Whooping cough, unspecified species without pneumonia |
| A37.91 | Whooping cough, unspecified species with pneumonia |
| A38 | Scarlet fever |
| A38.0 | Scarlet fever with otitis media |
| A38.1 | Scarlet fever with myocarditis |
| A38.8 | Scarlet fever with other complications |
| A38.9 | Scarlet fever, uncomplicated |
| A39 | Meningococcal infection |
| A39.0 | Meningococcal meningitis |
| A39.1 | Waterhouse-Friderichsen syndrome |
| A39.2 | Acute meningococcemia |
| A39.3 | Chronic meningococcemia |
| A39.4 | Meningococcemia, unspecified |
| A39.5 | Meningococcal heart disease |
| A39.50 | Meningococcal carditis, unspecified |
| A39.51 | Meningococcal endocarditis |
| A39.52 | Meningococcal myocarditis |
| A39.53 | Meningococcal pericarditis |
| A39.8 | Other meningococcal infections |
| A39.81 | Meningococcal encephalitis |
| A39.82 | Meningococcal retrobulbar neuritis |
| A39.83 | Meningococcal arthritis |
| A39.84 | Postmeningococcal arthritis |
| A39.89 | Other meningococcal infections |
| A39.9 | Meningococcal infection, unspecified |