Vero
U.S. ICD-10-CM · FY 2027

D66 ICD-10-CM Code: Hereditary factor VIII deficiency

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

D66

Hereditary factor VIII deficiency

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where D66 sits

  1. 1

    Chapter 3

    Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89)

  2. 2

    Section

    Coagulation defects, purpura and other hemorrhagic conditions (D65-D69)

  3. 3

    Category D66

    Hereditary factor VIII deficiency

  4. 4

    Code D66

    Hereditary factor VIII deficiency

Documentation details

Notes for this code

Inclusion terms

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

Code first

No “code first” instruction is listed for D66.

Use additional code

No “use additional code” instruction is listed for D66.

Excludes1

Conditions that should not be reported together with this code.

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

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for D66.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code D66 mean?

D66 is the FY 2027 U.S. ICD-10-CM code for “Hereditary factor VIII deficiency.”

Is D66 a billable or specific ICD-10-CM code?

Yes. In the FY 2027 reference data used on this page, D66 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.

Where is D66 located in ICD-10-CM?

D66 is listed in Chapter 3, Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89), within Coagulation defects, purpura and other hemorrhagic conditions (D65-D69) (D65–D69), under category D66, Hereditary factor VIII deficiency.

What coding notes are listed for D66?

Its listed inclusion terms are Classical hemophilia; Deficiency factor VIII (with functional defect); Hemophilia NOS; Hemophilia A. No code-first instruction is listed. Excludes1 notes: factor VIII deficiency with vascular defect (D68.0-). No Excludes2 note is listed.

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