D66

ICD-10Billable

Hereditary factor VIII deficiency

Official ICD-10-CM descriptor (FY2026)

Hereditary factor VIII deficiency

D66 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

  • Classical hemophilia
  • Deficiency factor VIII (with functional defect)
  • Hemophilia NOS
  • Hemophilia A

Excludes1

Not coded here. An Excludes1 code should never be reported at the same time as the code above it.

  • factor VIII deficiency with vascular defect (D68.0-)

Where this code sits

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Source

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.

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