Current
D66 — Hereditary factor VIII deficiency
Part of Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism , block Coagulation defects, purpura and other hemorrhagic conditions (D65-D69) .
Official Notes
Inclusion Terms
Classical hemophilia
Inclusion Terms
Deficiency factor VIII (with functional defect)
Inclusion Terms
Hemophilia NOS
Inclusion Terms
Hemophilia A
Excludes1
factor VIII deficiency with vascular defect ( D68.0- )
Child Codes
D66 has no child codes in the FY 2027 release -- it is used on its own.
Referenced By
Official notes on these codes cite D66.
FY 2027 effective October 1, 2026 · CDC NCHS and CMS