| A3684 | Diphtheritic tubulo-interstitial nephropathy |
| A3685 | Diphtheritic cystitis |
| A3686 | Diphtheritic conjunctivitis |
| A3689 | Other diphtheritic complications |
| A369 | Diphtheria, unspecified |
| A37 | Whooping cough |
| A370 | Whooping cough due to Bordetella pertussis |
| A3700 | Whooping cough due to Bordetella pertussis without pneumonia Whooping cough due to Bordetella pertussis without pneumonia |
| A3701 | Whooping cough due to Bordetella pertussis with pneumonia |
| A371 | Whooping cough due to Bordetella parapertussis |
| A3710 | Whooping cough due to Bordetella parapertussis w/o pneumonia Whooping cough due to Bordetella parapertussis without pneumonia |
| A3711 | Whooping cough due to Bordetella parapertussis with pneumonia |
| A378 | Whooping cough due to other Bordetella species |
| A3780 | Whooping cough due to other Bordetella species w/o pneumonia Whooping cough due to other Bordetella species without pneumonia |
| A3781 | Whooping cough due to other Bordetella species with pneumonia |
| A379 | Whooping cough, unspecified species |
| A3790 | Whooping cough, unspecified species without pneumonia |
| A3791 | Whooping cough, unspecified species with pneumonia |
| A38 | Scarlet fever |
| A380 | Scarlet fever with otitis media |
| A381 | Scarlet fever with myocarditis |
| A388 | Scarlet fever with other complications |
| A389 | Scarlet fever, uncomplicated |
| A39 | Meningococcal infection |
| A390 | Meningococcal meningitis |
| A391 | Waterhouse-Friderichsen syndrome |
| A392 | Acute meningococcemia |
| A393 | Chronic meningococcemia |
| A394 | Meningococcemia, unspecified |
| A395 | Meningococcal heart disease |
| A3950 | Meningococcal carditis, unspecified |
| A3951 | Meningococcal endocarditis |
| A3952 | Meningococcal myocarditis |
| A3953 | Meningococcal pericarditis |
| A398 | Other meningococcal infections |
| A3981 | Meningococcal encephalitis |
| A3982 | Meningococcal retrobulbar neuritis |
| A3983 | Meningococcal arthritis |
| A3984 | Postmeningococcal arthritis |
| A3989 | Other meningococcal infections |
| A399 | Meningococcal infection, unspecified |
| A40 | Streptococcal sepsis |
| A400 | Sepsis due to streptococcus, group A |
| A401 | Sepsis due to streptococcus, group B |
| A403 | Sepsis due to Streptococcus pneumoniae |
| A408 | Other streptococcal sepsis |
| A409 | Streptococcal sepsis, unspecified |
| A41 | Other sepsis |
| A410 | Sepsis due to Staphylococcus aureus |
| A4101 | Sepsis due to Methicillin susceptible Staphylococcus aureus |