ICD-10-CM · Chapter 1 · A00-B99
A49 Bacterial infection of unspecified site
Excludes 1 (cannot be coded together)
- bacterial agents as the cause of diseases classified elsewhere (B95-B96)
- meningococcal infection NOS (A39.9)
- rickettsial infection NOS (A79.9)
- spirochetal infection NOS (A69.9)
Excludes 2 (not included here)
- chlamydial infection NOS (A74.9)
Subcodes
Each subcode links to a detail page with full clinical annotations.
| Code | Description | Billable |
|---|---|---|
| A49..0 | Staphylococcal infection, unspecified site | No |
| A49..01 | Methicillin susceptible Staphylococcus aureus infection, unspecified site | Yes |
| A49..02 | Methicillin resistant Staphylococcus aureus infection, unspecified site | Yes |
| A49..1 | Streptococcal infection, unspecified site | Yes |
| A49..2 | Hemophilus influenzae infection, unspecified site | Yes |
| A49..3 | Mycoplasma infection, unspecified site | Yes |
| A49..8 | Other bacterial infections of unspecified site | Yes |
| A49..9 | Bacterial infection, unspecified | Yes |
Plain-language term for this code
The following entry in the US Medical Glossary corresponds to ICD-10-CM category A49:
- MRSA (Methicillin-Resistant Staphylococcus Aureus) — MRSA (Staphylococcus aureus resistente a la meticilina)
Last reviewed: September 2026