ICD-10-CM D66 is the diagnosis code for Hereditary factor VIII deficiency. This code falls under the section "Coagulation defects, purpura and other hemorrhagic conditions" within Chapter 3 — Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as D66. They are mutually exclusive:
Understanding where D66 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, D66 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
D66 is the ICD-10-CM diagnosis code for "Hereditary factor VIII deficiency". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
D66 is located in Section D65-D69 — "Coagulation defects, purpura and other hemorrhagic conditions" within Chapter 3 of the ICD-10-CM Tabular List.
Use D66 when the patients documented diagnosis matches "Hereditary factor VIII deficiency" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Hereditary factor VIII deficiency is D66.
Yes, D66 can be used as a primary diagnosis code since it is billable and specific.
D66 is in Chapter 3 of the ICD-10-CM Tabular List.
Type 1 Excludes for D66 include: factor VIII deficiency with vascular defect (D68.0-).
Yes, D66 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.