Biomarkers, TumorCD8-Positive T-LymphocytesDrug Resistance, Neoplasm
Dr. Marc Stuart Ernstoff, MD
NPI1275549073
- Medicare services, 2020
- 96
- Part D claims, 2019
- 14
- Publications
- 124
- Clinical trials
- 9
- Industry payments
- $28,702
- Practice address
- 515 Main St, Olean, NY 14760
- Practice phone
- Call (216) 559-6577
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Ernstoff's professional email, personal email and mobile number
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Dr. Marc Stuart Ernstoff is a medical oncologist in Olean, New York
Dr. Ernstoff practices in Olean, New York.
Dr. Ernstoff's NPI, 1275549073, was assigned on August 1, 2006. Dr. Ernstoff holds New York license 138461.
NPI and contact details
- NPI
- 1275549073NPI Registry (opens in a new tab)
- NPI enumeration date
- August 1, 2006
- NPI status
- Active
- Practice phone
- (216) 559-6577
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Marc Stuart Ernstoff's practice address is in Olean, New York
Dr. Ernstoff's practice address in the NPI Registry is 515 Main St, Olean, NY 14760, in Cattaraugus County. The practice phone is (216) 559-6577.
- NPI Registry address515 Main St, Olean, NY 14760 · Cattaraugus CountyPhone(216) 559-6577
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Marc Stuart Ernstoff's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ernstoff practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Ernstoff's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Marc Stuart Ernstoff is one of 458 medical oncologists in New York
Medical oncology is Dr. Ernstoff's primary specialty in the NPI Registry, under taxonomy code 207RX0202X. Dr. Ernstoff is licensed in New York.
Specialties and state licenses
- Medical oncology, New YorkPrimary
Medical oncologists near Dr. Ernstoff
Counts of medical oncologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Marc Stuart Ernstoff billed Medicare for 96 services in 2020
CMS data shows 96 Medicare services from Dr. Ernstoff across 2 procedure codes in 2020, all of them office visits. Medicare paid $4,971 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 202096
Paid by Medicare$4,971
Procedure codes2
Dr. Ernstoff's Medicare services by type, 2019 to 2020
- 2019
- 2020
- Office and hospital visits
- 2019: 1592020: 9640%
Dr. Ernstoff compared with the New York median for medical oncologists, 2020
- Dr. Ernstoff
- New York median
- Medicare services
- 96vs 34072% below
- Part D claims
- 14vs 13089% below
Medians across 421 medical oncologists in New York with Dmand AI profiles that report each measure.
Dr. Ernstoff's most billed Medicare procedure codes, 2020
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Marc Stuart Ernstoff's patients have a median age of 51
Across all payers, Dmand AI patient panel data puts Dr. Ernstoff's median patient age at 51, with 67% women.
Dr. Ernstoff's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 51
Patient panel by sex, all payers
- Women67%
- Men33%
Source: Dmand AI Patient Panel Data
Dr. Marc Stuart Ernstoff wrote 14 Medicare Part D claims in 2019
In 2019, Dr. Ernstoff wrote 14 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $285 in total drug cost. In 2018, CMS named 16 claims across 1 drug.
Part D claims, 201914
Drugs named by CMS1
Total drug cost$285
Dr. Ernstoff's most prescribed drugs by claims, 2019
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2018 to 2019
- 2018
- 2019
- Claims for drugs CMS names
- 2018: 162019: 1413%
Drugs named by CMS: 1 in 2019, 1 in 2018.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Marc Stuart Ernstoff has 124 publications on record
Dmand AI links 124 papers to Dr. Ernstoff, published from 2010 to 2025. 2019 was the busiest year, with 13. The most frequent topics are Melanoma, Skin Neoplasms and Immunotherapy. Dr. Ernstoff has published most often in J Immunother Cancer. Dr. Ernstoff's most frequent co-authors are Igor Puzanov, MD, David Francis McDermott, MD and Camilo E. Fadul, MD.
Papers124
Years published2010 to 2025
Dr. Ernstoff's papers by year, 2016 to 2025
Topics Dr. Ernstoff writes about most
- Melanoma
- Skin Neoplasms
- Immunotherapy
- Antineoplastic Combined Chemotherapy Protocols
- Immune Checkpoint Inhibitors
- CD8-Positive T-Lymphocytes
- Proto-Oncogene Proteins B-raf
- Antineoplastic Agents
Dr. Ernstoff's most frequent co-authors
- Igor Puzanov, MD22 shared papers
- David Francis McDermott, MD13 shared papers
- Camilo E. Fadul, MD10 shared papers
Recent publications by Dr. Ernstoff
Antineoplastic Combined Chemotherapy ProtocolsBrain NeoplasmsIpilimumab
J Immunother Cancer
Antibodies, Monoclonal, HumanizedAntineoplastic Combined Chemotherapy ProtocolsInterleukin-2
JCO Precis Oncol
DNA MethylationMelanomaSkin Neoplasms
See who Dr. Ernstoff researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Ernstoff works with, so you can find a warm path to the right medical oncologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Marc Stuart Ernstoff has worked on 9 clinical trials
Dmand AI links Dr. Ernstoff to 9 clinical trials, 3 of them phase 2 studies. 5 are still active or recruiting. Conditions studied include Melanoma, Nevi and Melanomas and Carcinoma, Merkel Cell. National Cancer Institute (NCI) sponsors the most, 5.
Clinical trials with Dr. Ernstoff by phase
- 1Phase 1: 1 trial
- 1Phase 1/2: 1 trial
- 3Phase 2: 3 trials
- 3Phase 3: 3 trials
- NonePhase 4: no trials
Conditions in Dr. Ernstoff's trials
- Melanoma
- Nevi and Melanomas
- Carcinoma, Merkel Cell
- Sarcoma, Kaposi
- Uveal Melanoma
Investigators on the most trials with Dr. Ernstoff
- Sunandana Chandra, MD4 shared trials
- Kari L. Kendra, MD4 shared trials
- Joseph I. Clark, MD3 shared trials
Recent clinical trials with Dr. Ernstoff
A Multicenter, Randomized, Double-Blinded, Placebo-Controlled, Phase 3 Trial of Adjuvant Avelumab (Anti-PDL-1 Antibody) in Merkel Cell Carcinoma Patients With Lymph Node Metastases (opens in a new tab)
Active, not recruitingPhase 3
Carcinoma, Merkel CellPolyomavirus InfectionsAvelumab
A Phase Ib/II Study of Propranolol With Fixed-Dose Pembrolizumab in Patients With Unresectable Stage III and Stage IV Melanoma (opens in a new tab)
SuspendedPhase 1/2
MelanomaNevi and MelanomasPembrolizumabPropranolol Hydrochloride
MelanomaNevi and Melanomas
Sarcoma, KaposiNeoplasms, Vascular TissuePembrolizumabAntiretroviral Therapy
A Study to Compare the Administration of Pembrolizumab After Surgery Versus Administration Both Before and After Surgery for High-Risk Melanoma (opens in a new tab)
Active, not recruitingPhase 2
Pembrolizumab
Sources: Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
Dr. Marc Stuart Ernstoff received $28,702 in industry payments from 2016 to 2020
CMS Open Payments shows 43 general payments to Dr. Ernstoff from 7 drug and device companies from 2016 to 2020. Consulting fees make up the largest share, 88% of the total. EMD Serono, Inc. paid the most, $11,786.
General payments to Dr. Ernstoff by program year, 2016 to 2020
General payments to Dr. Ernstoff by kind, 2016 to 2020
$28.7Kin total
- Consulting fees$25,14788%
- Food and beverage$1,9147%
- Travel and lodging$1,6386%
- Education$30%
Companies that paid Dr. Ernstoff the most, 2016 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Marc Stuart Ernstoff's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Marc Stuart Ernstoff
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Marc Stuart Ernstoff's NPI number?
Dr. Marc Stuart Ernstoff's NPI number is 1275549073. It was assigned on August 1, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Marc Stuart Ernstoff?
Dr. Marc Stuart Ernstoff is a medical oncologist in Olean, New York. The primary specialty in the NPI Registry is Medical Oncology Physician (taxonomy code 207RX0202X).
Where does Dr. Marc Stuart Ernstoff practice?
Dr. Ernstoff practices at 515 Main St, Olean, NY 14760.
What is Dr. Marc Stuart Ernstoff's office phone number?
The practice phone on file for Dr. Ernstoff is (216) 559-6577.
What is Dr. Marc Stuart Ernstoff's medical license number?
Dr. Ernstoff holds New York license 138461.
Does Dr. Marc Stuart Ernstoff accept Medicare?
Yes. CMS data shows Dr. Ernstoff billed Medicare for 96 services in 2020.
What services does Dr. Marc Stuart Ernstoff bill to Medicare?
In 2020, Dr. Ernstoff's most billed Medicare services were office visit, established patient (99214) and office visit, established patient (99213).
What drugs does Dr. Marc Stuart Ernstoff prescribe most?
In 2019 Medicare Part D data, Dr. Ernstoff's most prescribed drugs by claims were Prednisone.
Has Dr. Marc Stuart Ernstoff received payments from drug or device companies?
CMS Open Payments shows $28,702 in general payments to Dr. Ernstoff from 7 companies from 2016 to 2020. The largest total came from EMD Serono, Inc.
How long has Dr. Marc Stuart Ernstoff been practicing?
Dr. Ernstoff's NPI was assigned in 2006.
Does Dr. Marc Stuart Ernstoff do research?
Dmand AI links 124 publications to Dr. Ernstoff, published from 2010 to 2025. Dr. Ernstoff has worked on 9 clinical trials.
Who does Dr. Marc Stuart Ernstoff publish with?
Dr. Ernstoff's most frequent co-authors are Igor Puzanov, MD (22 shared papers), David Francis McDermott, MD (13 shared papers) and Camilo E. Fadul, MD (10 shared papers).
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