Jaroslaw Jac, MD - Medicare Hematology/oncology in Westborough, MA

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Jaroslaw Jac, MD is a medicare enrolled "Internal Medicine - Hematology & Oncology" physician in Westborough, Massachusetts. He graduated from medical school in 1990 and has 35 years of diverse experience with area of expertise as Hematology/oncology. He is a member of the group practice Community Medical Associates, Inc., Associated Physicians Of Harvard Medical Faculty Physicians At Beth Is and his current practice location is 150 Flanders Rd, Westborough, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (508) 870-2222.

Jaroslaw Jac is licensed to practice in Massachusetts (license number 238060) 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 1326029802.

Contact Information

Jaroslaw Jac, MD
150 Flanders Rd,
Westborough, MA 01581-1017
(508) 870-2222
Not Available

Map and Direction




Physician's Profile

Full NameJaroslaw Jac
GenderMale
SpecialityHematology/oncology
Experience35 Years
Location150 Flanders Rd, Westborough, 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:
  • Jaroslaw Jac graduated from medical school in 1990
  NPI Data:
  • NPI Number: 1326029802
  • Provider Enumeration Date: 11/10/2005
  • Last Update Date: 07/02/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 0244288371
  • Enrollment ID: I20090121000341

Medical Identifiers

Medical identifiers for Jaroslaw Jac such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1326029802NPI-NPPES
139379518MedicaidTX
110081560/AMedicaidMA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 35312 (New Hampshire)Secondary
207R00000XInternal Medicine 238060 (Massachusetts)Secondary
207RH0003XInternal Medicine - Hematology & Oncology MD13980 (Maine)Secondary
207RH0003XInternal Medicine - Hematology & Oncology 35312 (New Hampshire)Secondary
207RH0003XInternal Medicine - Hematology & Oncology J9106 (Texas)Secondary
207RH0003XInternal Medicine - Hematology & Oncology 238060 (Massachusetts)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Harrington Memorial Hospital-1Southbridge, MAHospital
Anna Jaques HospitalNewburyport, MAHospital
Northeast Hospital CorporationBeverly, MAHospital
Holy Family HospitalMethuen, MAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Community Medical Associates, Inc.6002946928119
Associated Physicians Of Harvard Medical Faculty Physicians At Beth Is6305749987495

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. Jaroslaw Jac allows following entities to bill medicare on his behalf.
Entity NameUmass Memorial Health-harrington Hospital Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1790780047
PECOS PAC ID: 8123087319
Enrollment ID: O20041004001081
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 NameCambridge Public Health Commission
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1932313228
PECOS PAC ID: 8921910894
Enrollment ID: O20050808000725
Entity NameIpc Hospitalists Of New England Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1659555266
PECOS PAC ID: 7618051442
Enrollment ID: O20080303000565
Entity NameCommunity Medical Associates, Inc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1144544040
PECOS PAC ID: 6002946928
Enrollment ID: O20100618000560
Entity NameSteward Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1629398219
PECOS PAC ID: 2860688728
Enrollment ID: O20101119000332
Entity NameAssociated Physicians Of Harvard Medical Faculty Physicians At Beth Is
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1497151773
PECOS PAC ID: 6305749987
Enrollment ID: O20150211001099

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. Jaroslaw Jac 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
Jaroslaw Jac, MD
15 Hospital Dr,
York, ME 03909-1011

Ph: (207) 351-2478		Jaroslaw Jac, MD
150 Flanders Rd,
Westborough, MA 01581-1017

Ph: (508) 870-2222

Reviews and Comments


Internal Medicine Doctors in Westborough, MA

Dr. Rekha Hari Nair, M.D.
Hematology & Oncology
Medicare: Medicare Enrolled
Practice Location: 176 E Main St, Westborough, MA 01581
Phone: 425-615-1623    Fax: 508-389-4919
Dr. Nandana Kansra, M.D.
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 112 Turnpike Rd Ste 301, Westborough, MA 01581
Phone: 508-366-1560    Fax: 508-386-2815
Ninad N Samant, MD
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 900 Union St, Westborough, MA 01581
Phone: 508-871-0700    Fax: 508-616-4411
Dr. Anthony Martin Zizza Iii, M.D.
Hematology & Oncology
Medicare: Medicare Enrolled
Practice Location: 1400 Computer Dr Ste 301, Westborough, MA 01581
Phone: 617-420-5316    
Christine M. Fitzgibbons, M.D.
Hematology & Oncology
Medicare: Medicare Enrolled
Practice Location: 154 E Main St, Westborough, MA 01581
Phone: 508-366-1120    
Dr. John B Mccahan, M.D.
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 33 E Main St, Westborough, MA 01581
Phone: 508-836-4884    Fax: 508-836-3351
Dr. Gordon S Manning, M.D.
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 154 E Main St, Suite 101, Westborough, MA 01581
Phone: 508-366-1120    

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).

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