D66 Hereditary factor VIII deficiency

The ICD-10-CM code for Hereditary factor VIII deficiency is D66 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

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

Section

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

Category D66

1 code (1 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to D66:

• Hemophilia (classical) (familial) (hereditary)
• Subhemophilia
• Arthropathy › hemophilic NEC
• Disease, diseased › bleeder's
• Hemophilia (classical) (familial) (hereditary) › A
• Arthropathy › in (due to) › hemophilia NEC
• Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) › due to or associated with › hemophilia
• Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) › in (due to) › hemophilia NEC

Inclusion Terms

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

U.S. Hospital Utilization

• An estimated 7,850 U.S. inpatient stays in 2023 included D66 among the documented diagnoses.
• 735 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Chapter 3 TOC entry

3. Chapter 3: Disease of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89) ............................................................................................. 39

Reserved for future guideline expansion

Reserved for future guideline expansion ...................................................................................... 39

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)

Cite This Page

Reference D66 with the canonical source and edition:

D66 — Hereditary factor VIII deficiency. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/D66

Canonical URL: https://icd10codingpro.com/codes/D66