William Fabricius, M.D.
NPI 1568698645 · Hematology & Oncology Physician · Greenville, MI
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Fabricius, M.D. is a Hematology & Oncology Physician provider in Greenville, MI (NPI 1568698645).
Provider details
- NPI number
- 1568698645
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD20974 (ME)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
17 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
4,937 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 643 | $8 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 587 | $9 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 399 | $10 |
| Flow Cytometry Technique for Dna Or Cell Analysis, Each Additional Marker88185 | 394 | $22 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 294 | $179 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 33 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Acyclovir | 161 | 39 |
| Prednisone | 130 | 47 |
| Hydroxyurea | 114 | 36 |
| Folic Acid | 75 | 28 |
| Prochlorperazine Maleate | 67 | 40 |
| Dexamethasone | 67 | 19 |
| Apixabanbrand: Eliquis | 58 | 16 |
| Allopurinol | 45 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,272 across 57 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-06-03
- Last updated
- 2021-07-06
- Certified
- 2021-07-06
Frequently asked questions
- What is William Fabricius's NPI number?
- William Fabricius's National Provider Identifier (NPI) is 1568698645, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Fabricius's specialty?
- William Fabricius is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is William Fabricius located?
- William Fabricius's practice location on file with NPPES is 615 S Bower St, Greenville, MI 48838-2614.
- What is William Fabricius's phone number?
- The practice phone number listed in the NPPES registry for William Fabricius is (616) 954-9800.
- Does William Fabricius accept Medicare?
- William Fabricius is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Fabricius's NPI active?
- Yes — William Fabricius's NPI (1568698645) is active in the NPPES registry as of the last update on 2021-07-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.