Dr Marcus S Dempster, MD - Medicare Internal Medicine in Williamsville, NY

  1. Home
  2. Hematology & Oncology
  3. NY
  4. Williamsville
Dr Marcus S Dempster, MD is a medicare enrolled "Internal Medicine - Hematology & Oncology" physician in Williamsville, New York. His current practice location is 199 Park Club Ln Ste 200, Williamsville, New York. You can reach out to his office (for appointments etc.) via phone at (716) 634-3340.

Dr Marcus S Dempster is licensed to practice in New York (license number 331143) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1881223519.

Contact Information

Dr Marcus S Dempster, MD
199 Park Club Ln Ste 200,
Williamsville, NY 14221-5269
(716) 634-3340
(716) 634-3350

Map and Direction




Physician's Profile

Full NameDr Marcus S Dempster
GenderMale
SpecialityInternal Medicine - Hematology & Oncology
Location199 Park Club Ln Ste 200, Williamsville, New York
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1881223519
  • Provider Enumeration Date: 04/04/2020
  • Last Update Date: 06/02/2026
  Medicare PECOS Information:
  • PECOS PAC ID: 6901237569
  • Enrollment ID: I20240726002160

Medical Identifiers

Medical identifiers for Dr Marcus S Dempster such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1881223519NPI-NPPES
07964107MedicaidNY

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RH0003XInternal Medicine - Hematology & Oncology 331143 (New York)Primary

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr Marcus S Dempster allows following entities to bill medicare on his behalf.
Entity NameRoswell Park Cancer Institute
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1720036593
PECOS PAC ID: 3577475110
Enrollment ID: O20031103000466

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr Marcus S Dempster is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr Marcus S Dempster, MD
199 Park Club Ln Ste 500,
Williamsville, NY 14221-5269

Ph: (716) 845-1300		Dr Marcus S Dempster, MD
199 Park Club Ln Ste 200,
Williamsville, NY 14221-5269

Ph: (716) 634-3340

Reviews and Comments


Internal Medicine Doctors in Williamsville, NY

John Daniel Picano, M.D.
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 60 Maple Rd Ste 1, Williamsville, NY 14221
Phone: 716-626-5250    
Maria Kontos, DO
Hematology & Oncology
Medicare: Medicare Enrolled
Practice Location: 325 Essjay Rd, Williamsville, NY 14221
Phone: 716-656-4463    
Dr. Anderson Ka Ho Lai, MD
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 1540 Maple Rd, Williamsville, NY 14221
Phone: 716-568-3514    
Colleen Klos,
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 1540 Maple Rd, Williamsville, NY 14221
Phone: 716-568-3514    
Dawn Patricia Hrab, M.D.
Hematology & Oncology
Medicare: Medicare Enrolled
Practice Location: 1835 Maple Rd, Williamsville, NY 14221
Phone: 716-634-5410    Fax: 716-634-0430
Cheri A Gorski-suhr, RPAC
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 825 Wehrle Drive, Cardiology Group Of Western New York,pc, Williamsville, NY 14221
Phone: 716-634-3243    Fax: 716-634-1930
Yijun Cheng, M.D.
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 295 Essjay Rd, Williamsville, NY 14221
Phone: 716-630-1048    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.