ICD-10-CM A49: Bacterial infection of unspecified site

ICD-10-CM Diagnosis Code (2025)

Official Description for A49

Bacterial infection of unspecified site

Coding Notes & Guidelines for A49

Excludes1: Not Coded Here
  • 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)
Excludes1: Not Coded Here

bacteremia NOS (R78.81)

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

Methicillin resistant Staphylococcus aureus (MRSA) infection

Child Codes (More Specific Codes for A49):

A49.0 - Staphylococcal infection, unspecified site A49.01 - Methicillin susceptible Staphylococcus aureus infection, unspecified site 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

About ICD-10-CM Code A49 (Bacterial infection of unspecified site)

ICD-10-CM code A49 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM A49 became effective on October 1, 2024.

This page provides detailed information about A49 - Bacterial infection of unspecified site. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Bacterial infection of unspecified site.