D84.1
ICD-10BillableDefects in the complement system
Official ICD-10-CM descriptor (FY2026)
Defects in the complement system
D84.1 is valid for submission on a claim — CMS flags it as a billable, specific code.
Inclusion terms
- C1 esterase inhibitor [C1-INH] deficiency
Related codes in D84
Where this code sits
- Parent code
- D84
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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.