2024 ICD-10-CM Diagnosis Code B59

by

Pneumocystosis

  • B59 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2024 edition of ICD-10-CM B59 became effective on October 1, 2023.
  • This is the American ICD-10-CM version of B59 – other international versions of ICD-10 B59 may differ.

Applicable To

  • Pneumonia due to Pneumocystis carinii
  • Pneumonia due to Pneumocystis jiroveci

The following code(s) above B59 contain annotation back-references

 that may be applicable to B59:

  • A00-B99  Certain infectious and parasitic diseases
  • B50-B64  Protozoal diseases

Approximate Synonyms

  • Pneumocystis pneumonia
  • Pneumocystosis pneumonia

Clinical Information

  • Pulmonary disease in humans, particularly affecting those who are immunodeficient, malnourished, or infants, is characterized by symptoms such as dyspnea (difficulty breathing), tachypnea (rapid breathing), and hypoxemia (low blood oxygen levels). One notable example is Pneumocystis pneumonia, an opportunistic infection commonly seen in AIDS patients. This condition is caused by the fungus Pneumocystis jirovecii. Similar diseases are also observed in other mammals, caused by related Pneumocystis species.
  • Pneumocystis carinii pneumonia (PCP) is a form of pneumonia resulting from infection with Pneumocystis carinii, frequently affecting immunocompromised individuals such as those with AIDS, steroid-treated patients, the elderly, or premature or debilitated infants during their first three months. Patients may exhibit minimal or no fever but are likely to experience significant weakness, difficulty breathing, and cyanosis (bluish discoloration of the skin due to lack of oxygen). This condition is a major cause of illness among AIDS patients.
  • Pulmonary disease in humans occurring in immunodeficient or malnourished patients or infants, characterized by dyspnea, tachypnea, and hypoxemia; pneumocystis pneumonia is a frequent opportunistic infection in aids; also found in other mammals where it is caused by related species of pneumocystis.

ICD-10-CM B59 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

  • 177 Respiratory infections and inflammations with mcc
  • 178 Respiratory infections and inflammations with cc
  • 179 Respiratory infections and inflammations without cc/mcc
  • 791 Prematurity with major problems
  • 793 Full term neonate with major problems
  • 974 Hiv with major related condition with mcc
  • 975 Hiv with major related condition with cc
  • 976 Hiv with major related condition without cc/mcc

Convert B59 to ICD-9-CMCode 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
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change

Code annotations containing back-references to B59:

Diagnosis Index entries containing back-references to B59:

  • Disease, diseased – see also Syndrome
  • Infection, infected, infective (opportunistic) B99.9
    • Pneumocystis carinii B59 (pneumonia)
    • Pneumocystis jiroveci B59 (pneumonia)
  • Pneumocystis carinii pneumonia B59
  • Pneumocystis jiroveci B59 (pneumonia)
  • Pneumocystosis B59 (with pneumonia)
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) J18.9
    • in (due to)
      • pneumocystosis B59 (Pneumocystis carinii) (Pneumocystis jiroveci)
    • interstitialJ84.9
      • plasma cell B59
    • plasma cell B59 (of infants)
    • Pneumocystis B59 (carinii) (jiroveci)