A49.9 Bacterial infection, unspecified

Billable ICD-10-CM code, FY2026.

Excludes1 (never code together)

• bacteremia NOS (R78.81)

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)

• 041.9 Bacterial infection, unspecified, in conditions classified elsewhere and of unspecified site (approximate)

Diagnosis Index entries for A49.9

• 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

Nearby codes

• 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
• A49.9 Bacterial infection, unspecified (this code)