Combined immunodeficiency

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Combined immunodeficiency due to FCHO1 deficiency

ORPHA:647804Disease

What it is

A rare combined T and B cell immunodeficiency characterized by early-onset of recurrent severe bacterial, viral, and fungal infections. Many patients present failure to thrive. Occurrence of lymphoma, as well as neurologic features, have been reported in some cases. Laboratory examination shows decreased CD4+ T cells and variable B cell lymphopenia and hypogammaglobulinemia.

Key facts

Inheritance
Autosomal recessive
Classified as
Disease

Gene

FCHO1Disease-causing germline mutation(s)

ICD-10 codes

D81.8filed under a broader ICD-10 category — shared with 49 other rare diseases

ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.

Related health topics

Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.

Cross-references

MONDO 0030898OMIM 619164UMLS C5816748

Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.

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