D81.9
ICD-10BillableCombined immunodeficiency, unspecified
Official ICD-10-CM descriptor (FY2026)
Combined immunodeficiency, unspecified
D81.9 is valid for submission on a claim — CMS flags it as a billable, specific code.
Inclusion terms
- Severe combined immunodeficiency disorder [SCID] NOS
Related codes in D81
- D81.0Severe combined immunodeficiency with reticular dysgenesis
- D81.1Severe combined immunodeficiency w low T- and B-cell numbers
- D81.2Severe combined immunodef w low or normal B-cell numbers
- D81.3Adenosine deaminase [ADA] deficiencycategory
- D81.4Nezelof's syndrome
- D81.5Purine nucleoside phosphorylase [PNP] deficiency
- D81.6Major histocompatibility complex class I deficiency
- D81.7Major histocompatibility complex class II deficiency
- D81.8Other combined immunodeficienciescategory
Where this code sits
- Parent code
- D81
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.