1. ICD-10-CM Codes
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2. A00-B99 Certain infectious and parasitic diseases
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3. A20-A28 Certain zoonotic bacterial diseases
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4. A23- Brucellosis
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5. 2021 ICD-10-CM Diagnosis Code A23.9

2021 ICD-10-CM Diagnosis Code A23.9

Brucellosis, unspecified

2016 2017 2018 2019 2020 2021 Billable/Specific Code

• A23.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2021 edition of ICD-10-CM A23.9 became effective on October 1, 2020.
• This is the American ICD-10-CM version of A23.9 - other international versions of ICD-10 A23.9 may differ.

• Brucellosis

• 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.

• 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 A23.9 to ICD-9-CM

• 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

• Code First: N16
  ICD-10-CM Diagnosis Code N16

  Renal tubulo-interstitial disorders in diseases classified elsewhere

  2016 2017 2018 2019 2020 2021 Billable/Specific Code Manifestation Code

  Applicable To

  • Pyelonephritis
  • Tubulo-interstitial nephritis

  Code First

  • underlying disease, such as:
  • brucellosis (A23.0-A23.9)
  • cryoglobulinemia (D89.1)
  • glycogen storage disease (E74.0)
  • leukemia (C91-C95)
  • lymphoma (C81.0-C85.9, C96.0-C96.9)
  • multiple myeloma (C90.0-)
  • sepsis (A40.0-A41.9)
  • Wilson's disease (E83.0)

  Type 1 Excludes

  • diphtheritic pyelonephritis and tubulo-interstitial nephritis (A36.84)
  • pyelonephritis and tubulo-interstitial nephritis in candidiasis (B37.49)
  • pyelonephritis and tubulo-interstitial nephritis in cystinosis (E72.04)
  • pyelonephritis and tubulo-interstitial nephritis in salmonella infection (A02.25)
  • pyelonephritis and tubulo-interstitial nephritis in sarcoidosis (D86.84)
  • pyelonephritis and tubulo-interstitial nephritis in sicca syndrome [Sjogren's] (M35.04)
  • pyelonephritis and tubulo-interstitial nephritis in systemic lupus erythematosus (M32.15)
  • pyelonephritis and tubulo-interstitial nephritis in toxoplasmosis (B58.83)
  • renal tubular degeneration in diabetes (E08-E13 with .29)
  • syphilitic pyelonephritis and tubulo-interstitial nephritis (A52.75)

• Brucellosis (infection) A23.9
  • sepsis A23.9
  • dermatitis A23.9
• Disorder (of) - see also Disease
  • tubulo-interstitial (in)
    • brucellosis A23.9
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) R50.9
  ICD-10-CM Diagnosis Code R50.9

  Fever, unspecified

  2016 2017 2018 2019 2020 2021 Billable/Specific Code

  Applicable To

  • Fever NOS
  • Fever of unknown origin [FUO]
  • Fever with chills
  • Fever with rigors
  • Hyperpyrexia NOS
  • Persistent fever
  • Pyrexia NOS
  • Mediterranean A23.9 - see also Brucellosis
  • Malta A23.9
• Infection, infected, infective (opportunistic) B99.9
  ICD-10-CM Diagnosis Code B99.9

  Unspecified infectious disease

  2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • Brucella A23.9
• Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) N05.9
  ICD-10-CM Diagnosis Code N05.9

  Unspecified nephritic syndrome with unspecified morphologic changes

  2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • tubulo-interstitial (in) N12
    ICD-10-CM Diagnosis Code N12

    Tubulo-interstitial nephritis, not specified as acute or chronic

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Interstitial nephritis NOS
    • Pyelitis NOS
    • Pyelonephritis NOS

    Type 1 Excludes

    • calculous pyelonephritis (N20.9)
    • due to
      • brucellosis A23.9
• Pyelonephritis - see also Nephritis, tubulo-interstitial
  • in (due to)
    • brucellosis A23.9
• Sepsis (generalized) (unspecified organism) A41.9
  ICD-10-CM Diagnosis Code A41.9

  Sepsis, unspecified organism

  2016 2017 2018 2019 2020 2021 Billable/Specific Code

  Applicable To

  • Septicemia NOS
  • Brucella A23.9 - see also Brucellosis
• Spondylitis (chronic) - see also Spondylopathy, inflammatory
  • in (due to)
    • brucellosis A23.9
      • cervical region A23.9
      • cervicothoracic region A23.9
      • lumbar region A23.9
      • lumbosacral region A23.9
      • multiple sites A23.9
      • occipito-atlanto-axial region A23.9
      • sacrococcygeal region A23.9
      • thoracic region A23.9
      • thoracolumbar region A23.9

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