GREGORY A MASTERS (MD) – Medical Oncology Physician, NPI 1508834680
Medical Oncology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
11 MEDICAL ONCOLOGY in DE
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Provider Addresses for GREGORY A MASTERS (MD)
ChristianaCare Helen F. Graham Cancer Center and Research Institute, 4701, Ogletown Stanton Road, Newark, New Castle County, Delaware, 19713, United States
SUITE 2200
NEWARK, DE 197132055
Phone: (302) 366-1200
Fax: (302) 366-1700
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 20 Open Payments records for all available years, with a total value of $411.
Total Amount is formed as General ($411) + Research ($0) + Ownership ($0) = $411.
Last reported payment date: 2024-12-11 • Largest payer in this snapshot: AstraZeneca Pharmaceuticals LP ($67).
Total Amount
$411
General + Research + Ownership
Payments
20
Total payment records
General Amount
$411
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-11
Latest reported date
Top Companies
Largest payers in this snapshot
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2010-02-25
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20100225000458 | I | Medical Oncology | DE | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| J9271 | Injection, pembrolizumab, 1 mg | 30,600 | 31 | $0 |
| J0897 | Injection, denosumab, 1 mg | 7,680 | 23 | $0 |
| J9299 | Injection, nivolumab, 1 mg | 7,540 | 12 | $0 |
| J9267 | Injection, paclitaxel, 1 mg | 6,782 | 14 | $0 |
| J9022 | Injection, atezolizumab, 10 mg | 6,264 | 11 | $0 |
Insurance plans in this area (ZIP 19713)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| MEDICAL ONCOLOGY | DE | 96367 | Infusion into a vein for therapy prevention or diagnosis additional sequential infusion up to 1 hour | 266 | 62 |
| MEDICAL ONCOLOGY | DE | 96375 | Injection of different drug or substance into a vein for therapy, diagnosis, or prevention | 475 | 56 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| H E M A T O L O G Y/ O N C O L O G Y | DE | |
| H E M A T O L O G Y/ O N C O L O G Y | DE | |
| H E M A T O L O G Y/ O N C O L O G Y | DE | |
| H E M A T O L O G Y/ O N C O L O G Y | DE | |
| Physician Assistant | DE | |
| - | DE | |
| H E M A T O L O G Y/ O N C O L O G Y | DE | |
| Nurse Practitioner | DE | |
| Nurse Practitioner | DE | |
| H E M A T O L O G Y/ O N C O L O G Y | DE |
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