Benjamin D Hamar, MD - Medicare Obstetrics/gynecology in Worcester, MA

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Benjamin D Hamar, MD is a medicare enrolled "Obstetrics & Gynecology - Maternal & Fetal Medicine" physician in Worcester, Massachusetts. He went to New York University School Of Medicine and graduated in 1999 and has 26 years of diverse experience with area of expertise as Obstetrics/gynecology. He is a member of the group practice Umass Memorial Medical Group Inc and his current practice location is 119 Belmont St, Worcester, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (508) 334-0550.

Benjamin D Hamar is licensed to practice in Massachusetts (license number 227040) 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 1003897877.

Contact Information

Benjamin D Hamar, MD
119 Belmont St,
Worcester, MA 01605-2903
(508) 334-0550
(508) 334-8412

Map and Direction




Physician's Profile

Full NameBenjamin D Hamar
GenderMale
SpecialityObstetrics/gynecology
Experience26 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:
  • Benjamin D Hamar attended and graduated from New York University School Of Medicine in 1999
  NPI Data:
  • NPI Number: 1003897877
  • Provider Enumeration Date: 11/09/2005
  • Last Update Date: 03/06/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 0547160269
  • Enrollment ID: I20060816000365

Medical Identifiers

Medical identifiers for Benjamin D Hamar such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1003897877NPI-NPPES
110073416AMedicaidMA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207VM0101XObstetrics & Gynecology - Maternal & Fetal Medicine 227040 (Massachusetts)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Umass Memorial Medical Center/university CampusWorcester, MAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Umass Memorial Medical Group Inc42845398912096

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. Benjamin D Hamar allows following entities to bill medicare on his behalf.
Entity NameHarvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1518908136
PECOS PAC ID: 4486567104
Enrollment ID: O20031204000710
Entity NameUmass Memorial Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1760445373
PECOS PAC ID: 4284539891
Enrollment ID: O20040113000267
Entity NameEssex County Obgyn Assoc Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1538275870
PECOS PAC ID: 6204829062
Enrollment ID: O20040407000041
Entity NameReliant Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1720017528
PECOS PAC ID: 5597755322
Enrollment ID: O20040708000650
Entity NameBeth Israel Deaconess Medical Center Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1548202641
PECOS PAC ID: 8123936119
Enrollment ID: O20041001000827
Entity NameSaint Vincent Physician Services Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1013997329
PECOS PAC ID: 8921056276
Enrollment ID: O20050104000566
Entity NameBmc Affiliated Physicians, Inc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1245320910
PECOS PAC ID: 9830133123
Enrollment ID: O20050617000054
Entity NameLgh Medical Group, Inc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1174698385
PECOS PAC ID: 3173626751
Enrollment ID: O20070320000453
Entity NameCircle Health Obgyn, Llc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1912179870
PECOS PAC ID: 1052483476
Enrollment ID: O20080630000642
Entity NameSteward Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1629398219
PECOS PAC ID: 2860688728
Enrollment ID: O20101119000007
Entity NameObhg Massachusetts - Direct Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1487229035
PECOS PAC ID: 1456752609
Enrollment ID: O20210625001903

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. Benjamin D Hamar 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
Benjamin D Hamar, MD
Po Box 415348,
Boston, MA 02241-5348

Ph: (800) 225-8885		Benjamin D Hamar, MD
119 Belmont St,
Worcester, MA 01605-2903

Ph: (508) 334-0550

Reviews and Comments


Obstetrics & Gynecology Doctors in Worcester, MA

Tara J. Chute, M.D.
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 119 Belmont St, Worcester, MA 01605
Phone: 508-334-1000    
Leah Wilson, M.D.
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 328 Shrewsbury St, Ste 100, Worcester, MA 01604
Phone: 508-755-4861    Fax: 508-752-1392
Mr. Donald James Desio, MD
Obstetrics & Gynecology
Medicare: Not Enrolled in Medicare
Practice Location: 123 Summer St, Suite 150 S, Worcester, MA 01608
Phone: 508-368-3110    Fax: 508-368-3113
Anne E. Garrison, M.D.
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 119 Belmont St, Worcester, MA 01605
Phone: 508-334-6255    
Debra M Papa, M.D.
Obstetrics & Gynecology
Medicare: Medicare Enrolled
Practice Location: 33 Kendall St, Department Of Obstetrics & Gynecology, Worcester, MA 01605
Phone: 508-334-6255    Fax: 508-334-6063
David J. Kanter, M.D.
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 119 Belmont St, Worcester, MA 01605
Phone: 508-334-0550    Fax: 508-334-8412

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.