A49 Bacterial infection of unspecified site

Not billable (header)Chapter 1

Report one of the more specific codes below.

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Codes under this one

A49.0 Staphylococcal infection, unspecified siteHeader
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

Instructional notes

Chapter 1

Excludes2Not included here: the patient may have both; report both when both are present.

carrier or suspected carrier of infectious disease (Z22.-)
certain localized infections - see body system-related chapters
infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
infectious and parasitic diseases specific to the perinatal period (P35-P39)
influenza and other acute respiratory infections (J00-J22)

Use additional codeAdd a second code for the full picture.

code to identify resistance to antimicrobial drugs (Z16.-)

Includes

diseases generally recognized as communicable or transmissible

This code

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.

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)

Excludes2Not included here: the patient may have both; report both when both are present.

chlamydial infection NOS (A74.9)

Chapter 1: Certain infectious and parasitic diseases · A30-A49 Other bacterial diseases (A30-A49)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.