2022 ICD-10-CM Diagnosis Code A49

Bacterial infection of unspecified site

    2016 2017 2018 2019 2020 2021 2022 Non-Billable/Non-Specific Code
  • A49 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2022 edition of ICD-10-CM A49 became effective on October 1, 2021.
  • This is the American ICD-10-CM version of A49 - other international versions of ICD-10 A49 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. 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.
  • bacterial agents as the cause of diseases classified elsewhere (
    ICD-10-CM Diagnosis Code B95

    Streptococcus, Staphylococcus, and Enterococcus as the cause of diseases classified elsewhere

      2016 2017 2018 2019 2020 2021 2022 Non-Billable/Non-Specific Code
    B95
    -
    ICD-10-CM Diagnosis Code B96

    Other bacterial agents as the cause of diseases classified elsewhere

      2016 2017 2018 2019 2020 2021 2022 Non-Billable/Non-Specific Code
    B96
    )
  • chlamydial infection NOS (
    ICD-10-CM Diagnosis Code A74.9

    Chlamydial infection, unspecified

      2016 2017 2018 2019 2020 2021 2022 Billable/Specific Code
    Applicable To
    • Chlamydiosis NOS
    A74.9
    )
  • meningococcal infection NOS (
    ICD-10-CM Diagnosis Code A39.9

    Meningococcal infection, unspecified

      2016 2017 2018 2019 2020 2021 2022 Billable/Specific Code
    Applicable To
    • Meningococcal disease NOS
    A39.9
    )
  • rickettsial infection NOS (
    ICD-10-CM Diagnosis Code A79.9

    Rickettsiosis, unspecified

      2016 2017 2018 2019 2020 2021 2022 Billable/Specific Code
    Applicable To
    • Rickettsial infection NOS
    A79.9
    )
  • spirochetal infection NOS (
    ICD-10-CM Diagnosis Code A69.9

    Spirochetal infection, unspecified

      2016 2017 2018 2019 2020 2021 2022 Billable/Specific Code
    A69.9
    )
The following code(s) above A49 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:
  • A00-B99
    2022 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
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.
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
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
ICD-10-CM Codes Adjacent To A49
A48 Other bacterial diseases, not elsewhere classified
A48.0 Gas gangrene
A48.1 Legionnaires' disease
A48.2 Nonpneumonic Legionnaires' disease [Pontiac fever]
A48.3 Toxic shock syndrome
A48.4 Brazilian purpuric fever
A48.5 Other specified botulism
A48.51 Infant botulism
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

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