D66
✓ Billable
Hereditary factor VIII deficiency
ICD-10-CM · FY2026 · Diseases of the Blood and Blood-Forming Organs
Code
D66
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Diseases of the Blood and Blood-Forming Organs
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Also known as
- Classical hemophilia
- Deficiency factor VIII (with functional defect)
- Hemophilia NOS
- Hemophilia A
Excludes1 — never code together
- factor VIII deficiency with vascular defect (D68.0-)
Frequently asked questions
What is ICD-10 code D66?
ICD-10-CM code D66 represents Hereditary factor VIII deficiency. It is a billable diagnosis code in the Diseases of the Blood and Blood-Forming Organs chapter, effective October 1, 2025 – September 30, 2026.
Is D66 billable?
Yes. D66 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is D66 in?
D66 belongs to the Diseases of the Blood and Blood-Forming Organs chapter (D50–D89) of ICD-10-CM.
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