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 34 years of diverse experience with area of expertise as Hematology/oncology. He is a member of the group practice Steward Medical Group Inc, Umass Memorial Medical Group Inc 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
Experience34 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: 01/02/2019
  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
110081560/AMedicaidMA
139379518MedicaidTX

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 238060 (Massachusetts)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
Holy Family HospitalMethuen, MAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Steward Medical Group Inc28606887281338
Umass Memorial Medical Group Inc42845398911898

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 Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1760445373
PECOS PAC ID: 4284539891
Enrollment ID: O20040113000267
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 NameNew England Inpatient Specialist Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1487606570
PECOS PAC ID: 6305852922
Enrollment ID: O20060306000478
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 NameSteward Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1629398219
PECOS PAC ID: 2860688728
Enrollment ID: O20101119000332

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. 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    
Maria Lourdes S Angeles, M.D.
Hematology & Oncology
Medicare: Not Enrolled in Medicare
Practice Location: Umass Correctional Health Program, One Research Drive, Westborough, MA 01581
Phone: 508-475-3220    
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    
Matthew K Bonner, M.D.
Hematology & Oncology
Medicare: Not Enrolled in Medicare
Practice Location: 19 Overlook Dr, Westborough, MA 01581
Phone: 508-366-8734    

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.

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