2022 ICD-10-CM Diagnosis Code A23


    2016 2017 2018 2019 2020 2021 2022 Non-Billable/Non-Specific Code
  • A23 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 A23 became effective on October 1, 2021.
  • This is the American ICD-10-CM version of A23 - other international versions of ICD-10 A23 may differ.
Includes Help
"Includes" further defines, or give examples of, the content of the code or category.
  • Malta fever
  • Mediterranean fever
  • undulant fever
The following code(s) above A23 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 A23:
  • A00-B99
    2022 ICD-10-CM Range A00-B99

    Certain infectious and parasitic diseases

    • 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
  • A gram negative bacterial infection caused by bacteria of the genus brucella. Humans are infected by ingesting unpasteurized milk or meat from infected animals. Signs and symptoms include fevers, sweating, weakness, headache, muscle pain, arthritis and anemia.
  • Infection caused by bacteria of the genus brucella mainly involving the mononuclear phagocyte system. This condition is characterized by fever, weakness, malaise, and weight loss.
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
Code annotations containing back-references to A23:
  • Code First: M49
    ICD-10-CM Diagnosis Code M49

    Spondylopathies in diseases classified elsewhere

      2016 2017 2018 2019 2020 2021 2022 Non-Billable/Non-Specific Code
    Code First
    • underlying disease, such as:
    • brucellosis (A23.-)
    • Charcot-Marie-Tooth disease (G60.0)
    • enterobacterial infections (A01-A04)
    • osteitis fibrosa cystica (E21.0)
    • curvature of spine in diseases classified elsewhere
    • deformity of spine in diseases classified elsewhere
    • kyphosis in diseases classified elsewhere
    • scoliosis in diseases classified elsewhere
    • spondylopathy in diseases classified elsewhere
    Type 1 Excludes
    • curvature of spine in tuberculosis [Pott's] (A18.01)
    • enteropathic arthropathies (M07.-)
    • gonococcal spondylitis (A54.41)
    • neuropathic [tabes dorsalis] spondylitis (A52.11)
    • neuropathic spondylopathy in syringomyelia (G95.0)
    • neuropathic spondylopathy in tabes dorsalis (A52.11)
    • nonsyphilitic neuropathic spondylopathy NEC (G98.0)
    • spondylitis in syphilis (acquired) (A52.77)
    • tuberculous spondylitis (A18.01)
    • typhoid fever spondylitis (A01.05)
ICD-10-CM Codes Adjacent To A23
A21.7 Generalized tularemia
A21.8 Other forms of tularemia
A21.9 Tularemia, unspecified
A22 Anthrax
A22.0 Cutaneous anthrax
A22.1 Pulmonary anthrax
A22.2 Gastrointestinal anthrax
A22.7 Anthrax sepsis
A22.8 Other forms of anthrax
A22.9 Anthrax, unspecified
A23 Brucellosis
A23.0 Brucellosis due to Brucella melitensis
A23.1 Brucellosis due to Brucella abortus
A23.2 Brucellosis due to Brucella suis
A23.3 Brucellosis due to Brucella canis
A23.8 Other brucellosis
A23.9 Brucellosis, unspecified
A24 Glanders and melioidosis
A24.0 Glanders
A24.1 Acute and fulminating melioidosis
A24.2 Subacute and chronic melioidosis

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