A49.01 Methicillin susceptible Staphylococcus aureus infection, unspecified site

Billable ICD-10-CM code, FY2026.

Applicable to

• Methicillin susceptible Staphylococcus aureus (MSSA) infection
• Staphylococcus aureus infection NOS

Applies from A49 Bacterial infection of unspecified site

Excludes1 (never code together)

• bacterial agents as the cause of diseases classified elsewhere (B95-B96)
• chlamydial infection NOS (A74.9)
• meningococcal infection NOS (A39.9)
• rickettsial infection NOS (A79.9)
• spirochetal infection NOS (A69.9)

MS-DRG index

Defines the logic of DRG(s) 867-869 in MDC 18.

Approximate ICD-9-CM (GEMs)

• 041.11 Methicillin susceptible Staphylococcus aureus in conditions classified elsewhere and of unspecified site (approximate)

Diagnosis Index entries for A49.01

• Infection, infected, infective (opportunistic) › methicillin › susceptible Staphylococcus aureus (MSSA)
• Infection, infected, infective (opportunistic) › staphylococcal, unspecified site › aureus (methicillin susceptible) (MSSA)
• MSSA (Methicillin susceptible Staphylococcus aureus) › infection

Nearby codes

• A49 Bacterial infection of unspecified site
• A49.0 Staphylococcal infection, unspecified site
• A49.01 Methicillin susceptible Staphylococcus aureus infection, unspecified site (this code)
• 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