Physician Profile
Unclaimed ProfileAbout MASTERS
Gregory A Masters, MD is a healthcare provider in Newark, DE specialising in medical oncology. Gregory trained at Northwestern University Feinberg Medical School, graduating in 1990.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What does Dr. Masters specialise in?
Dr. Masters is a medical oncology in Newark, DE. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “MEDICAL ONCOLOGY”.
NPI registry
Where is Dr. Masters located?
Dr. Masters is listed at 4701 OGLETOWN STANTON RD SUITE 2200, Newark, DE 19713. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Masters's phone number?
The number on file is (302) 366-1200. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Masters's NPI number?
Dr. Masters's National Provider Identifier is 1508834680. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Masters go to medical school?
Dr. Masters attended Northwestern University Feinberg Medical School, graduating in 1990. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Masters been practising?
Dr. Masters has 36 years experience. Calculated from a graduation year of 1990, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Masters do most often?
According to Medicare billing data, Dr. Masters provides treatments such as administration of chemotherapy into vein, 1 hour or less and injection of additional new drug or substance into vein, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Masters confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Masters. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (302) 366-1200
- Email not available
Practice Locations
4701 OGLETOWN STANTON RD SUITE 2200
Newark, DE 19713
Procedures Most Often Billed to Medicare
37,472 services · 1,051 patients · 25 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Administration of chemotherapy into vein, 1 hour or less | Treatment | 96413 |
424 |
| Injection of additional new drug or substance into vein | Treatment | 96375 |
303 |
| Infusion into a vein for therapy, prevention, or diagnosis, additional sequential infusion, 1 hour or less | Treatment | 96367 |
146 |
| Administration of additional new drug or substance into vein, 1 hour or less | Treatment | 96417 |
112 |
| Injection of drug or substance under skin or into muscle | Treatment | 96372 |
108 |
| Administration of additional new drug or substance into vein using push technique | Treatment | 96411 |
65 |
| Administration of chemotherapy into vein, each additional hour | Treatment | 96415 |
54 |
| Infusion into a vein for therapy, prevention, or diagnosis, each additional hour | Treatment | 96366 |
27 |
| Injection, pembrolizumab, 1 mg | Drug given | J9271 |
14,200 |
| Injection, denosumab, 1 mg | Drug given | J0897 |
7,860 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
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Claim this profileRelated providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other medical oncology specialists at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 24 related providers in 4 groups
Other medical oncology specialists in Newark 2
Same specialty, same city.
Trained at Northwestern University Feinberg Medical School 8
Other providers in the same specialty who trained at the same institution.
Class of 1990 at Northwestern University Feinberg Medical School 8
Providers who graduated from the same medical school in the same year.
Also performs Administration of chemotherapy into vein, 1 hour or less 6
Providers in DE who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.