Marcus S. Dempster, MD
Hematology & Oncology Physician · Williamsville, NY
Marcus S. Dempster, MD is a hematology & oncology physician with a practice address in Williamsville, New York, and NPI 1881223519, issued on Apr 4, 2020. Check the license (New York 331143, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Marcus S. Dempster
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 331143 NY
Self-reported in NPPES; status is on the state search - Practice location
- 199 Park Club LN Ste 200, Williamsville, NY 14221
- Phone
- (716) 634-3340
- Enumerated
- Apr 4, 2020
- Record last updated
- Jun 2, 2026
- Fax
- (716) 634-3350
- Medicaid ID
- 07964107 NY
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,163 in New York → Look up another NPI →
Also registered at 199 Park Club LN Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Katherine Chojnicki, FNPFamily Nurse Practitioner1831697713
- Frederick Hong, MDHematology & Oncology Physician1366436198
- Michael Krabak, MDHematology & Oncology Physician1578557302
- Candelaria McElhinny, RPA-CPhysician Assistant1922363274
- Danielle Paolini, PAPhysician Assistant1144535675
Verify Marcus S. Dempster in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 331143Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
83% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
151 Medicare Part D claims for 74 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Anastrozole13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Marcus S. Dempster among 1,163 hematology & oncology physician records in New York
Marcus S. Dempster, MD is one of 1,163 hematology & oncology physician records with a practice address in New York. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 95% of them.
- NPI issued2020 · 95% of these records are older, 3% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 72% of these records are
- Record last updated2026 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in New York
There are 1,163 hematology & oncology physician records in New York.
All 1,163 in New York → Every provider in Williamsville → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Yijun Cheng, M.D.Williamsville, NY 142211013058213
- James Conway, MDWilliamsville, NY 142211952367252
- Frederick Hong, MDWilliamsville, NY 142211366436198
- Ankita Kapoor, MDWilliamsville, NY 142211184285785
- Adam Kotowski, MDWilliamsville, NY 142211992813828
- Michael Krabak, MDWilliamsville, NY 142211578557302
- Hong Liu, MD PHDWilliamsville, NY 142211942383807
- Fiyinfolu OdemuyiwaWilliamsville, NY 142211104347558
Common questions
What is Marcus S. Dempster, MD's NPI number?
Marcus S. Dempster, MD's National Provider Identifier (NPI) is 1881223519, issued on Apr 4, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Marcus S. Dempster, MD located?
The NPPES record lists a practice address at 199 Park Club LN Ste 200, Williamsville, NY, 14221. Phone: (716) 634-3340. Providers update this record themselves, so call before visiting.
How can I verify Marcus S. Dempster, MD's license?
NPPES lists New York license number 331143, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marcus S. Dempster, MD prescribe under Medicare Part D?
In 2024, Marcus S. Dempster, MD had 151 Medicare Part D claims for 74 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.