William Derosa, D.O.
NPI 1902894991 · Medical Oncology Physician · Morristown, NJ
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Derosa, D.O. is a Medical Oncology Physician provider in Morristown, NJ (NPI 1902894991).
Provider details
- NPI number
- 1902894991
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 25MB03927200 (NJ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
4,931 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 519 | $9 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 512 | $8 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 429 | $10 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 423 | $196 |
| Magnesium Level83735 | 418 | $7 |
| Uric Acid Level, Blood84550 | 418 | $4 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 26 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 67 | 19 |
| Ruxolitinib Phosphatebrand: Jakafi | 47 | — |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 37 | 12 |
| Famciclovir | 28 | 12 |
| Acyclovir | 27 | — |
| Hydroxyurea | 27 | — |
| Rivaroxabanbrand: Xarelto | 24 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-10-12
- Last updated
- 2026-04-08
- Certified
- 2026-04-08
Frequently asked questions
- What is William Derosa's NPI number?
- William Derosa's National Provider Identifier (NPI) is 1902894991, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Derosa's specialty?
- William Derosa is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is William Derosa located?
- William Derosa's practice location on file with NPPES is 95 Madison Ave, Morristown, NJ 07960-6092.
- What is William Derosa's phone number?
- The practice phone number listed in the NPPES registry for William Derosa is (973) 538-5210.
- Does William Derosa accept Medicare?
- William Derosa is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Derosa's NPI active?
- Yes — William Derosa's NPI (1902894991) is active in the NPPES registry as of the last update on 2026-04-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.