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A49.01

A49.01: Methicillin susceptible Staphylococcus aureus infection, unspecified site

Billable / specific codeICD-10-CM

A49.01 is a billable, specific ICD-10-CM code for methicillin susceptible staphylococcus aureus infection, unspecified site. It is valid for submission on a claim.

Check A49.01 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

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

Excludes1 inherited from the categories above A49.01

A category’s note binds every code beneath it.

Written on A49: Bacterial infection of unspecified site

  • 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)

Excludes2 inherited from the categories above A49.01

Not part of this code, but both may be coded when both are present.

Written on A49: Bacterial infection of unspecified site

  • chlamydial infection NOS (A74.9)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Alphabetic index entries that lead here

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

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under A49.0

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.