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Edit this profileAt a glance
- 4701 Ogletown Stanton Rd, Suite 2200, Newark, DE 19713
About Dr. Masters
Gregory A. Masters, MD is a healthcare provider in Newark, DE specializing in medical oncology. Gregory trained at Northwestern University Feinberg Medical School, graduating in 1990. According to Medicare claims data, Gregory cared for 1,051 Medicare patients across 37,472 services. The services billed most often include injection, pembrolizumab, 1 mg, injection, denosumab, 1 mg, and injection, paclitaxel, 1 mg. This provider record is associated with NPI 1508834680.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (302) 366-1200
- Email not available
Practice Locations
4701 OGLETOWN STANTON RD SUITE 2200
Newark, DE 19713
Conditions Commonly Evaluated or Treated
Within Medical Oncology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Anemia
- Blood clots
- Breast cancer
- Colon cancer
- Iron-deficiency anemia
- Leukemia
- Lung cancer
- Lymphoma
- Prostate cancer
Abdominal cancer
- Peritoneal Cancer
Blood cancer
- Blood Cancer
Blood disorders
Cancer complications
Chest cancer
Complications
- Abdominal fluid swelling from cancer
- Fluid around lungs from cancer
Digestive cancer
Digestive cancers
Endocrine cancer
- Adrenal Tumors in Children
Endocrine cancers
Eye cancer
General oncology
Genetic risk
Gynecologic cancer
Gynecologic cancers
Head and neck
Head and neck cancer
- Head and neck cancer
- Oral cavity cancer
- Salivary Gland Cancer
Metastatic cancer
Metastatic disease
- Cancer spread to bones
- Cancer that spread to brain
- Cancer that spread to liver
Neurologic cancers
Sarcomas
Skin cancer
Symptom evaluation
Thoracic cancers
Treatment side effects
- Chemo Rash
- Mouth Sores From Chemo
- Nerve Pain From Chemo
Urologic cancer
Urologic cancers
Procedures & services
Most searched procedures
Cancer treatment care
- Immunotherapy Side Effect Management
- Maintenance Cancer Therapy
Complication management
- Cancer Blood Clot Treatment
Consultations
- Cancer survivorship care
- Integrative oncology consultation
- Post-cancer surveillance scan review
- Pre-Surgery Chemotherapy Consultation
- Preventative Chemotherapy Consultation
- Radiopharmaceutical therapy consultation
- Second Opinion For Cancer
- Stem cell transplant consultation
- Tumor Board Case Review
Diagnostic testing
Diagnostics
- Bone Marrow Biopsy
- Cancer Genetic Testing
- Pathology second opinion for cancer
- Tumor Biomarker Testing
Infusions
- Bone Strengthening Infusion
- Iron Infusion
- IV hydration for cancer patients
- Neurologic infusion treatment
Injections
Medication management
- Oral cancer medication monitoring
Patient education
- Chemo Teaching And Education
Port and line care
- Central line placement in child
- Chemo port removal
- PICC line care and removal
Procedures
Specialized treatments
- Bladder instillation therapy
- Heated Chemotherapy Consultation
- Hepatic Artery Pump Chemotherapy Consultation
Specialty treatments
- Bone Strengthening Injections For Cancer
- CAR-T Therapy
- Chemo allergy desensitization
- Clinical Trial Screening
- Hormone Therapy For Cancer
- Spinal chemo injection
Supportive care
- Advance Care Planning For Cancer
- Cancer nutrition counseling
- Cancer pain management
- Cancer Rehabilitation Evaluation
- Cancer weight loss management
- Chemo brain treatment
- Chemo nausea treatment
- Cold cap therapy for hair loss
- Fertility Preservation for Teens Before Cancer Treatment
- Hospice care consultation
- Lymphedema evaluation
- Palliative cancer care
Treatment side effects
- Chemo Rash Treatment
Vascular access
- Chemo port flush and care
- Chemo port placement
- PICC line care and flush
Procedures Most Often Billed to Medicare
37,472 services · 1,051 patients · 25 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Administration of chemotherapy into vein, 1 hour or less | Treatment | 96413 |
424 | More often than most peers in Medical Oncology |
| Injection of additional new drug or substance into vein | Treatment | 96375 |
303 | More often than most peers in Medical Oncology |
| Infusion into a vein for therapy, prevention, or diagnosis, additional sequential infusion, 1 hour or less | Treatment | 96367 |
146 | As often as other peers in Medical Oncology |
| Administration of additional new drug or substance into vein, 1 hour or less | Treatment | 96417 |
112 | More often than most peers in Medical Oncology |
| Injection of drug or substance under skin or into muscle | Treatment | 96372 |
108 | As often as other peers in Medical Oncology |
| Administration of additional new drug or substance into vein using push technique | Treatment | 96411 |
65 | More often than most peers in Medical Oncology |
| Administration of chemotherapy into vein, each additional hour | Treatment | 96415 |
54 | As often as other peers in Medical Oncology |
| Infusion into a vein for therapy, prevention, or diagnosis, each additional hour | Treatment | 96366 |
27 | Less often than most peers in Medical Oncology |
| Injection, pembrolizumab, 1 mg | Drug given | J9271 |
14,200 | As often as other peers in Medical Oncology |
| Injection, denosumab, 1 mg | Drug given | J0897 |
7,860 | More often than most peers in Medical Oncology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other oncologists 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 — 17 related providers in 3 groups
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.
Common questions
What does Dr. Masters specialize in?
Dr. Masters is an oncologist in Newark, DE. That is the designation recorded for this NPI in the federal registry, where it is listed 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. Contact the office directly to confirm availability and scheduling.
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 practicing?
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.
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