Dr Issam A Oneyssi, MD - Medicare Internal Medicine in Southbridge, MA

Dr Issam A Oneyssi, MD is a medicare enrolled "Internal Medicine" physician in Southbridge, Massachusetts. He graduated from medical school in 1990 and has 34 years of diverse experience with area of expertise as Internal Medicine. He is a member of the group practice Umass Memorial Medical Group Inc and his current practice location is 100 South St, Southbridge, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (508) 765-9771.

Dr Issam A Oneyssi is licensed to practice in Massachusetts (license number 76569) 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 1528026622.

Contact Information

Dr Issam A Oneyssi, MD
100 South St,
Southbridge, MA 01550-4051
(508) 765-9771
(508) 909-7735

Map and Direction




Physician's Profile

Full NameDr Issam A Oneyssi
GenderMale
SpecialityInternal Medicine
Experience34 Years
Location100 South St, Southbridge, 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:
  • Dr Issam A Oneyssi graduated from medical school in 1990
  NPI Data:
  • NPI Number: 1528026622
  • Provider Enumeration Date: 05/01/2006
  • Last Update Date: 12/21/2011
  Medicare PECOS Information:
  • PECOS PAC ID: 0446244933
  • Enrollment ID: I20040408000747

Medical Identifiers

Medical identifiers for Dr Issam A Oneyssi such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1528026622NPI-NPPES
3103641MedicaidMA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 76569 (Massachusetts)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Harrington Memorial Hospital-1Southbridge, MAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
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. Dr Issam A Oneyssi 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 NameHarrington Physician Services Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1346420874
PECOS PAC ID: 2567543689
Enrollment ID: O20080115000505
Entity NameEmerson Practice Associates, Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1508020199
PECOS PAC ID: 8123188117
Enrollment ID: O20081120000518

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 Issam A Oneyssi 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 Issam A Oneyssi, MD
100 South St,
Southbridge, MA 01550-4051

Ph: (508) 765-9771
Dr Issam A Oneyssi, MD
100 South St,
Southbridge, MA 01550-4051

Ph: (508) 765-9771

Reviews and Comments


Internal Medicine Doctors in Southbridge, MA

Dr. Andrei Bandarchuk, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 55 Sayles St, Southbridge, MA 01550
Phone: 508-764-2400    Fax: 508-909-7770
Dr. Krishnaveni Sirigaddi, MD
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 100 South St, Southbridge, MA 01550
Phone: 508-765-9771    
Dr. John Gus Stagias, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 428 Hamilton St, Southbridge, MA 01550
Phone: 508-765-1600    Fax: 508-765-0253
Mary E Frisella, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 100 South St, Southbridge, MA 01550
Phone: 508-764-6041    Fax: 508-764-6318
Dr. William Francis Dunn, D.O.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 100 South St, Suite G08, Southbridge, MA 01550
Phone: 508-764-2620    Fax: 508-765-1807
Tai Temple, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 100 South St, Southbridge, MA 01550
Phone: 508-765-9771    Fax: 508-909-7735
Dr. Patrick Alain Duplan, MD
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 100 South St, Southbridge, MA 01550
Phone: 508-765-9771    Fax: 508-909-7735

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.