William W Tollefsen, MD - Medicare Emergency Medicine in Worcester, MA

William W Tollefsen, MD is a medicare enrolled "Emergency Medicine" physician in Worcester, Massachusetts. He went to New York Medical College and graduated in 2008 and has 16 years of diverse experience with area of expertise as Emergency Medicine. He is a member of the group practice South Shore Health Express Inc, Coastal Medical Associates and his current practice location is 119 Belmont St, Department Of Emergency Medicine, Worcester, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (508) 421-1400.

William W Tollefsen is licensed to practice in Massachusetts (license number 243758) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1841462876.

Contact Information

William W Tollefsen, MD
119 Belmont St, Department Of Emergency Medicine,
Worcester, MA 01605-2903
(508) 421-1400
(508) 421-1490

Map and Direction




Physician's Profile

Full NameWilliam W Tollefsen
GenderMale
SpecialityEmergency Medicine
Experience16 Years
Location119 Belmont St, Worcester, Massachusetts
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • William W Tollefsen attended and graduated from New York Medical College in 2008
  NPI Data:
  • NPI Number: 1841462876
  • Provider Enumeration Date: 03/31/2008
  • Last Update Date: 11/13/2012
  Medicare PECOS Information:
  • PECOS PAC ID: 3870741127
  • Enrollment ID: I20120912000310

Medical Identifiers

Medical identifiers for William W Tollefsen such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1841462876NPI-NPPES
110091833AMedicaidMA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine 243758 (Massachusetts)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
South Shore HospitalSouth weymouth, MAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
South Shore Health Express Inc640610883632
Coastal Medical Associates7113029257424

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. William W Tollefsen allows following entities to bill medicare on his behalf.
Entity NameCoastal Medical Associates
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1932175684
PECOS PAC ID: 7113029257
Enrollment ID: O20070221000057
Entity NameSouth Shore Health Express Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1477044212
PECOS PAC ID: 6406108836
Enrollment ID: O20181115000152

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. William W Tollefsen 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
William W Tollefsen, MD
Po Box 415348,
Boston, MA 02241-5348

Ph: () -
William W Tollefsen, MD
119 Belmont St, Department Of Emergency Medicine,
Worcester, MA 01605-2903

Ph: (508) 421-1400

Reviews and Comments


Emergency Medicine Doctors in Worcester, MA

Hillary R. Irons, MD
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Practice Location: 55 Lake Ave N, Worcester, MA 01655
Phone: 508-421-1400    Fax: 508-421-1490
Dr. Thomas Evans, M.D.
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Practice Location: 281 Lincoln St, Med Staff Svcs, Worcester, MA 01605
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Romolo J. Gaspari, MD
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Phone: 508-421-1400    Fax: 508-421-1490
Alexander Hart, M.D.
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Practice Location: 55 Lake Ave N, Worcester, MA 01655
Phone: 508-334-1000    
Roderick Cross, M.D.
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Medicare: Accepting Medicare Assignments
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Austin Tam, MD, SCM
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Medicare: Accepting Medicare Assignments
Practice Location: 123 Summer St, Worcester, MA 01608
Phone: 508-363-5000    
Robert Brewer, M.D.
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Medicare: Medicare Enrolled
Practice Location: 281 Lincoln St, Medical Staff Svcs, Worcester, MA 01605
Phone: 508-421-1439    

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.