| A40 | Streptococcal sepsis |
| A40.0 | Sepsis due to streptococcus, group A |
| A40.1 | Sepsis due to streptococcus, group B |
| A40.3 | Sepsis due to Streptococcus pneumoniae |
| A40.8 | Other streptococcal sepsis |
| A40.9 | Streptococcal sepsis, unspecified |
| A41 | Other sepsis |
| A41.0 | Sepsis due to Staphylococcus aureus |
| A41.01 | Sepsis due to Methicillin susceptible Staphylococcus aureus |
| A41.02 | Sepsis due to Methicillin resistant Staphylococcus aureus |
| A41.1 | Sepsis due to other specified staphylococcus |
| A41.2 | Sepsis due to unspecified staphylococcus |
| A41.3 | Sepsis due to Hemophilus influenzae |
| A41.4 | Sepsis due to anaerobes |
| A41.5 | Sepsis due to other Gram-negative organisms |
| A41.50 | Gram-negative sepsis, unspecified |
| A41.51 | Sepsis due to Escherichia coli [E. coli] |
| A41.52 | Sepsis due to Pseudomonas |
| A41.53 | Sepsis due to Serratia |
| A41.59 | Other Gram-negative sepsis |
| A41.8 | Other specified sepsis |
| A41.81 | Sepsis due to Enterococcus |
| A41.89 | Other specified sepsis |
| A41.9 | Sepsis, unspecified organism |
| A42 | Actinomycosis |
| A42.0 | Pulmonary actinomycosis |
| A42.1 | Abdominal actinomycosis |
| A42.2 | Cervicofacial actinomycosis |
| A42.7 | Actinomycotic sepsis |
| A42.8 | Other forms of actinomycosis |
| A42.81 | Actinomycotic meningitis |
| A42.82 | Actinomycotic encephalitis |
| A42.89 | Other forms of actinomycosis |
| A42.9 | Actinomycosis, unspecified |
| A43 | Nocardiosis |
| A43.0 | Pulmonary nocardiosis |
| A43.1 | Cutaneous nocardiosis |
| A43.8 | Other forms of nocardiosis |
| A43.9 | Nocardiosis, unspecified |
| A44 | Bartonellosis |
| A44.0 | Systemic bartonellosis |
| A44.1 | Cutaneous and mucocutaneous bartonellosis |
| A44.8 | Other forms of bartonellosis |
| A44.9 | Bartonellosis, unspecified |
| A46 | Erysipelas |
| A48 | Other bacterial diseases, not elsewhere classified |
| A48.0 | Gas gangrene |
| A48.1 | Legionnaires' disease |
| A48.2 | Nonpneumonic Legionnaires' disease [Pontiac fever] |
| A48.3 | Toxic shock syndrome |
| A48.4 | Brazilian purpuric fever |
| A48.5 | Other specified botulism |
| A48.51 | Infant botulism |
| A48.52 | Wound botulism |
| A48.8 | Other specified bacterial diseases |
| A49 | Bacterial infection of unspecified site |
| A49.0 | Staphylococcal infection, unspecified site |
| A49.01 | Methicillin susceptible Staphylococcus aureus infection, unspecified site |
| A49.02 | Methicillin resistant Staphylococcus aureus infection, unspecified site |
| A49.1 | Streptococcal infection, unspecified site |
| A49.2 | Hemophilus influenzae infection, unspecified site |
| A49.3 | Mycoplasma infection, unspecified site |
| A49.8 | Other bacterial infections of unspecified site |
| A49.9 | Bacterial infection, unspecified |