A49.9
Bacterial infection, unspecified
A49.9 (also written A499) is a billable ICD-10-CM diagnosis code for bacterial infection, unspecified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 7 codes in category A49 (Bacterial infection of unspecified site). The Alphabetic Index lists it under 5 entries. Its coding notes include a Use additional code instruction, 5 Excludes1 entries and 6 Excludes2 entries.
Use additional code
Add the listed code as a secondary code, if known.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
- bacteremia NOS (R78.81)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (5 notes)
- 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)
Includes
Further defines or gives examples of the content of the category.
Also from chapter/block level (1 note)
- diseases generally recognized as communicable or transmissible
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 5 entries
- Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute), in (due to), bacterial disease
- Disease, diseased, bacterial
- Infection, infected, infective (opportunistic), Bacillus
- Infection, infected, infective (opportunistic), bacterial NOS
- Infection, infected, infective (opportunistic), gram-negative bacilli NOS