D66 ICD-10-CA code: Hereditary factor VIII deficiency
D66 is the ICD-10-CA code for “Hereditary factor VIII deficiency” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
D66Hereditary factor VIII deficiency
ICD-10-CA · Canada
Index terms
Entries in CIHI’s alphabetical index that lead to D66. Searching the index by the condition the note names is how coders reach this code.
- Hemophilia (familial) (hereditary)
- Hemophilia (familial) (hereditary), A
- Hemophilia (familial) (hereditary), classical
- Deficiency, deficient, antihemophilic globulin NEC
- Deficiency, deficient, factor, VIII (congenital) (functional) (hereditary) (with functional defect)
Notes for D66
As CIHI prints them, with any note D66 takes from the headings above it.
Includes
- Deficiency factor VIII (with functional defect)Haemophilia:• NOS• A• classical
Excludes
Conditions classified elsewhere.
- Factor VIII deficiency with vascular defect (D68.0)
- Autoimmune disease (systemic) NOS (M35.9)certain conditions originating in the perinatal period (P00-P96)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)human immunodeficiency virus [HIV] disease (B24)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89)
Where D66 sits
- 1ChapterChapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89)
- 2Block D65-D69Coagulation defects, purpura and other haemorrhagic conditions
- 3Valid code D66Hereditary factor VIII deficiency
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code D66 mean?
D66 is the ICD-10-CA code for “Hereditary factor VIII deficiency” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is D66 in ICD-10-CA?
D66 sits under D65-D69 Coagulation defects, purpura and other haemorrhagic conditions, within Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89).
What coding notes apply to D66?
ICD-10-CA lists Includes, Excludes notes for D66, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.