2027 ICD-10-CM Diagnosis Code A49.8Other bacterial infections of unspecified site
ICD-10-CM Codes›A00–B99›A30-A49›A49
- Billable — Valid for Submission
- Not Chronic
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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 867 through 869. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections.
Code Identity
Code Classification
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 Bacillus cereus
- Infection caused by Bacillus thuringiensis
- Infection caused by Bacteroides
- Infection caused by Bifidobacterium
- Infection caused by Burkholderia
- Infection caused by Burkholderia stabilis
- 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 Escherichia coli
- Infection caused by extended spectrum beta-lactamase producing Klebsiella pneumoniae
- Infection caused by extended-spectrum beta-lactamase-producing bacteria
- 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 Trueperella pyogenes
- 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
- Recurrent infection caused by Burkholderia cepacia
- Recurrent infection caused by Escherichia coli
- Recurrent infection caused by Gram-negative bacteria
- Recurrent infection caused by Klebsiella
- Recurrent infection caused by Serratia marcescens
- 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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A49.8: its own notes plus those printed at A49 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- diseases generally recognized as communicable or transmissible
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- 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 Code
Add a second code, after this one, to fully describe the condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
cepacia A49.8
Colibacillosis A49.8
Friedländer's B (bacillus) NEC See Also: condition; A49.8
Infection, infected, infective (opportunistic) B99.9
Friedländer's NEC A49.8
Bacteroides NEC A49.8
Cronobacter (sakazakii) A49.8
Pseudomonas NEC A49.8
Serratia NEC A49.8
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Code HistoryHistory
Questions About A49.8Overview
What is the ICD-10 code for other bacterial infections of unspecified site?
The ICD-10-CM code for other bacterial infections of unspecified site is A49.8 (sometimes written as A498). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
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, 869, 868, with relative weights from 0.6784 to 2.1855 depending on complications. Higher weights mean higher Medicare reimbursement.
Can A49.8 be reported with A39.9?
Not as a rule. The Excludes1 note at A49, which applies to A49.8, lists "meningococcal infection NOS (A39.9)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
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.
