D66Billable
Hereditary factor VIII deficiency
- Chapter
- 3. Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
- Category
- D66
- Effective date
- October 1, 2026
Frequently asked questions
What is ICD-10 code D66?
D66 is an ICD-10-CM diagnosis code for Hereditary factor VIII deficiency.
Is D66 a billable code?
Yes. D66 is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is D66 in?
D66 falls under Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism.
When did D66 become effective?
D66 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.