2020 ICD-10-CM Diagnosis Code A49.9

Bacterial infection, unspecified

    2016 2017 2018 2019 2020 Billable/Specific Code
  • A49.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM A49.9 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of A49.9 - other international versions of ICD-10 A49.9 may differ.
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as A49.9. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • bacteremia NOS (
    ICD-10-CM Diagnosis Code R78.81

    Bacteremia

      2016 2017 2018 2019 2020 Billable/Specific Code
    Type 1 Excludes
    • sepsis-code to specified infection
    R78.81
    )
The following code(s) above A49.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to A49.9:
  • A00-B99
    2020 ICD-10-CM Range A00-B99

    Certain infectious and parasitic diseases

    Includes
    • diseases generally recognized as communicable or transmissible
    Type 1 Excludes
    • certain localized infections - see body system-related chapters
    Type 2 Excludes
    • carrier or suspected carrier of infectious disease (Z22.-)
    • 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 to identify resistance to antimicrobial drugs (Z16.-)
    Certain infectious and parasitic diseases
  • A49
    ICD-10-CM Diagnosis Code A49

    Bacterial infection of unspecified site

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • 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)
    Bacterial infection of unspecified site
Approximate Synonyms
  • Bacterial infection
  • Bacterial infectious disease
  • Disease due to gram-negative bacteria
  • Gram negative bacterial disease
Clinical Information
  • An acute infectious disorder caused by gram positive or gram negative bacteria. Representative examples include pneumococcal , streptococcal, salmonella and meningeal infections.
  • Bacteria are living things that have only one cell. Under a microscope, they look like balls, rods, or spirals. They are so small that a line of 1,000 could fit across a pencil eraser. Most bacteria won't hurt you - less than 1 percent of the different types make people sick. Many are helpful. Some bacteria help to digest food, destroy disease-causing cells, and give the body needed vitamins. Bacteria are also used in making healthy foods like yogurt and cheese.but infectious bacteria can make you ill. They reproduce quickly in your body. Many give off chemicals called toxins, which can damage tissue and make you sick. Examples of bacteria that cause infections include streptococcus, staphylococcus, and e. Coli.antibiotics are the usual treatment. When you take antibiotics, follow the directions carefully. Each time you take antibiotics, you increase the chances that bacteria in your body will learn to resist them. Later, you could get or spread an infection that those antibiotics cannot cure.
  • Infections and associated diseases caused by bacteria, general or unspecified.
  • Infections by bacteria, general or unspecified.
ICD-10-CM A49.9 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 867 Other infectious and parasitic diseases diagnoses with mcc
  • 868 Other infectious and parasitic diseases diagnoses with cc
  • 869 Other infectious and parasitic diseases diagnoses without cc/mcc

Convert A49.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change

Diagnosis Index entries containing back-references to A49.9:
  • Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) M19.90
    ICD-10-CM Diagnosis Code M19.90

    Unspecified osteoarthritis, unspecified site

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Arthrosis NOS
    • Arthritis NOS
    • Osteoarthritis NOS
    • in (due to)
      • bacterial disease A49.9 - see also subcategory M01
  • Disease, diseased - see also Syndrome
  • Infection, infected, infective (opportunistic) B99.9
    ICD-10-CM Diagnosis Code B99.9

    Unspecified infectious disease

      2016 2017 2018 2019 2020 Billable/Specific Code

ICD-10-CM Codes Adjacent To A49.9
A48.52 Wound botulism
A48.8 Other specified bacterial diseases
A49 Bacterial infection of unspecified site
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
A50 Congenital syphilis
A50.0 Early congenital syphilis, symptomatic
A50.01 Early congenital syphilitic oculopathy
A50.02 Early congenital syphilitic osteochondropathy
A50.03 Early congenital syphilitic pharyngitis
A50.04 Early congenital syphilitic pneumonia
A50.05 Early congenital syphilitic rhinitis
A50.06 Early cutaneous congenital syphilis
A50.07 Early mucocutaneous congenital syphilis
A50.08 Early visceral congenital syphilis

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.