2026 ICD-10-CM Diagnosis Code A49.8Other bacterial infections of unspecified site

ICD-10-CM Codes›A00–B99›A30-A49›A49

ICD-10-CM A49.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A49.8 is a billable ICD-10-CM diagnosis code for other bacterial infections of unspecified site. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 867 through 869. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections.

Code Identity

ICD-10-CM Code
A49.8
Billable Status
Yes — Valid for Submission
Code Describes
Other bacterial infections of unspecified site
Short Description
Other bacterial infections of unspecified site
Same as the full description in the CMS dataset.
Parent Code
A49
Bacterial infection of unspecified site

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA30-A49Other bacterial diseases
CategoryA49Bacterial infection of unspecified site
This CodeA49.8Other bacterial infections of unspecified site

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acinetobacter calcoaceticus or Acinetobacter haemolyticus
  • Aeromonas hydrophila or Aeromonas punctata
  • Aeromonas or Plesiomonas present
  • Agrobacterium radiobacter or Agrobacterium tumefaciens
  • Anaerococcus tetradius or Anaerococcus prevotii
  • Bacterial infection caused by Bacillus
  • Bacterial infection caused by Klebsiella pneumoniae
  • Bacterial infection caused by Morganella morganii
  • Bacterial infection caused by Proteus mirabilis
  • Bacterial infection caused by Pseudomonas
  • Bacterial infection caused by Serratia
  • Botryomycosis
  • Brevundimonas diminuta or Brevundimonas vesicularis
  • Brevundimonas diminuta or Oligella urethralis
  • Campylobacteriosis
  • Capnocytophaga canimorsus or Capnocytophaga cynodegmi
  • Chryseobacterium indologenes or Brevundimonas vesicularis
  • Chryseobacterium indologenes or Empedobacter brevis
  • Chryseomonas luteola or Pseudomonas oryzihabitans
  • Citrobacter amalonaticus or Citrobacter koseri
  • Citrobacter braakii or Citrobacter freundii or Citrobacter sedlakii
  • Citrobacter freundii or Citrobacter youngae
  • Citrobacter koseri or Citrobacter farmeri
  • Citrobacter werkmanii or Citrobacter youngae
  • Clostridial infection
  • Colibacillosis gravidarum
  • Columnaris disease
  • Corynebacterium afermentans or Corynebacterium coyleae
  • Corynebacterium auris or Turicella otitidis
  • Delftia acidovorans or Comamonas testosteroni
  • Dermacoccus nishinomiyaensis or Kytococcus sedentarius
  • Diphtheria like disorder caused by Corynebacterium pseudotuberculosis
  • Disease caused by Moraxella
  • Enterobacter cloacae or Enterobacter asburiae
  • Enterococcus casseliflavus or Enterococcus gallinarum
  • Enterococcus durans or Enterococcus hirae
  • Escherichia coli or Hafnia alvei
  • Gemella morbillorum or Streptococcus agalactiae or Streptococcus acidominimus
  • Haemophilus infection
  • Infection by Bacteroides fragilis
  • Infection by Campylobacter fetus
  • Infection caused by Abiotrophia
  • Infection caused by Acinetobacter
  • Infection caused by Acinetobacter baumannii
  • Infection caused by Arcanobacterium pyogenes
  • Infection caused by Bacillus cereus
  • Infection caused by Bacillus thuringiensis
  • Infection caused by Bacteroides
  • Infection caused by Bifidobacterium
  • Infection caused by Burkholderia
  • Infection caused by carbapenem resistant Acinetobacter
  • Infection caused by carbapenem resistant bacteria
  • Infection caused by carbapenemase-producing Enterobacteriaceae
  • Infection caused by Citrobacter
  • Infection caused by Clostridium botulinum
  • Infection caused by Clostridium chauvoei
  • Infection caused by Clostridium novyi
  • Infection caused by coagulase-negative Staphylococcus
  • Infection caused by Corynebacterium
  • Infection caused by Corynebacterium jeikeium
  • Infection caused by Corynebacterium kutscheri
  • Infection caused by Corynebacterium minutissimum
  • Infection caused by Cronobacter
  • Infection caused by Enterobacter
  • Infection caused by Enterobacteriaceae
  • Infection caused by ESBL Klebsiella oxytoca
  • Infection caused by ESBL Proteus mirabilis
  • Infection caused by Escherichia coli O157
  • Infection caused by Escherichia coli O158
  • Infection caused by extended spectrum beta-lactamase producing bacteria
  • Infection caused by extended spectrum beta-lactamase producing Escherichia coli
  • Infection caused by extended spectrum beta-lactamase producing Klebsiella pneumoniae
  • Infection caused by Fusobacterium
  • Infection caused by Grimontia hollisae
  • Infection caused by Klebsiella
  • Infection caused by Klebsiella aerogenes
  • Infection caused by Lactococcus
  • Infection caused by Mannheimia haemolytica
  • Infection caused by multi drug resistant bacteria
  • Infection caused by multidrug resistant Acinetobacter
  • Infection caused by non-cholerae vibrio
  • Infection caused by Plesiomonas shigelloides
  • Infection caused by Shiga toxin producing Escherichia coli
  • Infection caused by Ureaplasma urealyticum
  • Infection caused by Vibrio
  • Infection caused by Vibrio alginolyticus
  • Infection caused by Vibrio fluvialis
  • Infection caused by Vibrio mimicus
  • Infection caused by Vibrio parahaemolyticus
  • Infection due to multidrug resistant Acinetobacter baumannii
  • Klebsiella pneumoniae or Klebsiella oxytoca
  • Kocuria varians or Kocuria rosea
  • Mannheimia haemolytica or Bibersteinia trehalosi
  • Micrococcus luteus or Micrococcus lylae
  • Mima polymorpha infection
  • Morganella infection
  • Pasteurella haemolytica or Rodentibacter pneumotropicus
  • Peptostreptococcus infection
  • Prevotella buccalis or Prevotella oralis
  • Prevotella buccalis or Prevotella veroralis
  • Prevotella loescheii or Prevotella denticola
  • Prevotella nigrescens or Prevotella intermedia
  • Prevotella oris or Prevotella buccae
  • Proteus infection
  • Proteus mirabilis or Proteus penneri
  • Proteus vulgaris or Proteus penneri
  • Providencia alcalifaciens or Providencia rustigianii
  • Pseudomonal botryomycosis
  • Pseudomonas fluorescens or Pseudomonas putida
  • Pseudomonas fluorescens or Pseudomonas putida or Pseudomonas mendocina
  • Pseudomonas stutzeri or Pseudomonas mendocina
  • Shewanella algae or Shewanella putrefaciens
  • Staphylococcus aureus or Staphylococcus intermedius
  • Staphylococcus saprophyticus or Staphylococcus hominis
  • Staphylococcus warneri or Staphylococcus pasteuri
  • Superadded anaerobic infection
  • Superimposed infection
  • Ulcer caused by Bacteroides
  • Vibrio fluvialis or Vibrio furnissii
  • Vibrio vulnificus infection
  • Weeksella virosa or Empedobacter brevis
  • Yersinia frederiksenii or Yersinia intermedia

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Burkholderia
      • cepacia
    • Colibacillosis
    • Friedländer's B(bacillus) NEC
    • Infection, infected, infective(opportunistic)
      • Bacillus
        • Friedländer's NEC
    • Infection, infected, infective(opportunistic)
      • bacterial NOS
        • as cause of disease classified elsewhere
          • Cronobacter (sakazakii)
    • Infection, infected, infective(opportunistic)
      • Bacteroides NEC
    • Infection, infected, infective(opportunistic)
      • Cronobacter (sakazakii)
    • Infection, infected, infective(opportunistic)
      • Escherichia (E.) coli NEC
    • Infection, infected, infective(opportunistic)
      • Klebsiella (K.) pneumoniae NEC
    • Infection, infected, infective(opportunistic)
      • mixed flora (bacterial) NEC
    • Infection, infected, infective(opportunistic)
      • Proteus (mirabilis) (morganii) (vulgaris) NEC
    • Infection, infected, infective(opportunistic)
      • Pseudomonas NEC
    • Infection, infected, infective(opportunistic)
      • Serratia NEC

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INF003
Bacterial infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Bacterial Infections

Bacteria are tiny organisms (living things) that have only one cell. Under a microscope, they look like balls, rods, or spirals. They can be found almost everywhere on Earth. There are lots of bacteria in and on your body. In fact, your body has about 10 times more bacteria cells than human cells.

The full article covers:

  • What are bacteria?
  • How do bacterial infections spread?
  • What are the treatments for bacterial infections?
  • Can bacterial infections be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert A49.8 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
041.89 Oth specf bacteria
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About A49.8Overview

Is A49.8 (Bacterial infection of unspecified site) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other bacterial infections of unspecified site on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does A49.8 group to?

When other bacterial infections of unspecified site is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 868, 869, with relative weights from 0.7297 to 2.0932 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of A49.8?

Under the General Equivalence Mappings, other bacterial infections of unspecified site converts to ICD-9-CM 041.89 (oth specf bacteria). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.