Search for a rare disease

* (*) mandatory field

Other search option(s)

Suggest an update

(*) Required fields.


Only comments seeking to improve the quality and accuracy of information on the Orphanet website are accepted. For all other comments, please send your remarks via contact us. Only comments written in English can be processed.

Orphanet doesn't provide personalised answers. To get in touch with the Orphanet team, please contact

Information provided in your contribution (including your email address) will be stocked in .CSV files that will be sent as an email to Orphanet's teams. These emails might be conserved in the teams' mailboxes, in our backoffice servers but will not be registered in our databases (for more information see our section General Data Protection Regulation and data privacy (GDPR) and Confidentiality).

Captcha image

Idiopathic CD4 lymphocytopenia

Disease definition

Idiopathic CD4 lymphocytopenia is a rare primary immunodeficiency disorder characterized by persistent CD4 T-cell lymphopenia (less than 300 cells/µL on multiple occasions) not associated with any other underlying primary or secondary immune deficiency. Patients typically present opportunistic infections (with cryptococcal, mycobacterial, candidal, varicella zoster virus infections and progressive multifocal leukoencephalopathy being the most prevalent), malignancies (mainly lymphoproliferative disorders), or autoimmune disorders. Some individuals are asymptomatic and incidentally diagnosed.


Classification level: Disorder
  • Synonym(s): -
  • Prevalence: Unknown
  • Inheritance: Not applicable 
  • Age of onset: Adult
  • ICD-10: D72.8
  • ICD-11: 4A00.2
  • OMIM: 615518
  • UMLS: C4706550
  • MeSH: -
  • GARD: 12375
  • MedDRA: -

Detailed information


ERN produced/endorsed by ERN(s)   FSMR produced/endorsed by FSMR(s)
The documents contained in this web site are presented for information purposes only. The material is in no way intended to replace professional medical care by a qualified specialist and should not be used as a basis for diagnosis or treatment.