Ellen Ronnen, MD
NPI 1003828823 · Hematology & Oncology Physician · East Brunswick, NJ
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ellen Ronnen, MD is a Hematology & Oncology Physician provider in East Brunswick, NJ (NPI 1003828823).
Provider details
- NPI number
- 1003828823
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 25MA08099000 (NJ)
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
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
5,047 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 813 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 626 | $148 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test85027 | 605 | $6 |
| Flow Cytometry Technique for Dna Or Cell Analysis, Each Additional Marker88185 | 406 | $29 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 404 | $8 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 27 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 234 | 68 |
| Apixabanbrand: Eliquis | 115 | 20 |
| Epoetin Alfabrand: Procrit | 88 | 19 |
| Darbepoetin Alfa in Polysorbatbrand: Aranesp | 73 | 12 |
| Palbociclibbrand: Ibrance | 36 | — |
| Rivaroxabanbrand: Xarelto | 36 | 11 |
| Hydroxyurea | 35 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$239 across 13 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
Additional practice locations (1)
- J2 Brier Hill CourtEast Brunswick, NJ 08816Phone: (732) 390-7750Fax: (732) 390-7725
Registry dates
- Enumerated
- 2006-08-12
- Last updated
- 2023-05-20
- Certified
- 2023-05-20
Frequently asked questions
- What is Ellen Ronnen's NPI number?
- Ellen Ronnen's National Provider Identifier (NPI) is 1003828823, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ellen Ronnen's specialty?
- Ellen Ronnen is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Ellen Ronnen located?
- Ellen Ronnen's practice location on file with NPPES is 629 Cranbury Rd Fl 2, East Brunswick, NJ 08816-4096.
- What is Ellen Ronnen's phone number?
- The practice phone number listed in the NPPES registry for Ellen Ronnen is (732) 390-7750.
- Does Ellen Ronnen accept Medicare?
- Ellen Ronnen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ellen Ronnen's NPI active?
- Yes — Ellen Ronnen's NPI (1003828823) is active in the NPPES registry as of the last update on 2023-05-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.