D66 — Hereditary factor VIII deficiency
Is D66 billable?
Yes — D66 is billable for FY2027. D66 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. D66 may be submitted for encounters from October 1, 2026 through September 30, 2027.
D66 at a glance
| Code | D66 |
|---|---|
| Description | Hereditary factor VIII deficiency |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does D66 group to?
D66 sits in MDC 16 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 813Coagulation Disordersmedical
As a secondary diagnosis, D66 is a major complication or comorbidity (MCC), which can move a stay into a higher-paying DRG.
How is D66 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to D66. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Hemophilia (classical) (familial) (hereditary)
- Subhemophilia
- Arthropathy › hemophilic NEC
- Disease, diseased › bleeder's
- Hemophilia › A (classical) (familial) (hereditary)
- Arthritis, arthritic › due to or associated with › hemophilia (acute) (chronic) (nonpyogenic) (subacute)
- Arthritis, arthritic › in › hemophilia NEC (acute) (chronic) (nonpyogenic) (subacute)
- Arthropathy › in › hemophilia NEC
- Deficiency, deficient › anti-hemophilic › factor
- Deficiency, deficient › anti-hemophilic › globulinNEC
- Deficiency, deficient › factor › VIII
Excludes1 — never code together
The conditions below can never be reported together with D66 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- factor VIII deficiency with vascular defect (D68.0-)
Inclusion terms
Alternative wording in documentation that is classified to D66.
- Classical hemophilia
- Deficiency factor VIII (with functional defect)
- Hemophilia NOS
- Hemophilia A
Excludes2 — not included here — inherited from Chapter 3
The conditions below are not part of D66, but a patient may have both at the same time. When documentation supports it, D66 and the excluded code may both be reported.
- autoimmune disease (systemic) NOS (M35.9)
- certain conditions originating in the perinatal period (P00-P96)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- human immunodeficiency virus [HIV] disease (B20)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
How long has D66 existed?
D66 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with D66?
ICD-10-CM declares these codes mutually exclusive with D66 — exactly one of each pair can be correct for a given encounter.