Nathan E Riddell, MD - Medicare Internal Medicine in Worcester, MA

Nathan E Riddell, MD is a medicare enrolled "Internal Medicine" physician in Worcester, Massachusetts. He graduated from medical school in 2013 and has 11 years of diverse experience with area of expertise as Internal Medicine. He is a member of the group practice Lgh Merrimack Valley Cardiology Associates, Llc and his current practice location is 55 Lake Ave N, Worcester, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (508) 334-1000.

Nathan E Riddell is licensed to practice in Massachusetts (license number 256554) 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 1245670983.

Contact Information

Nathan E Riddell, MD
55 Lake Ave N,
Worcester, MA 01655-0002
(508) 334-1000
Not Available

Map and Direction




Physician's Profile

Full NameNathan E Riddell
GenderMale
SpecialityInternal Medicine
Experience11 Years
Location55 Lake Ave N, 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:
  • Nathan E Riddell graduated from medical school in 2013
  NPI Data:
  • NPI Number: 1245670983
  • Provider Enumeration Date: 06/26/2013
  • Last Update Date: 06/26/2013
  Medicare PECOS Information:
  • PECOS PAC ID: 2062643489
  • Enrollment ID: I20180809005466

Medical Identifiers

Medical identifiers for Nathan E Riddell such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1245670983NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 256554 (Massachusetts)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Lowell General HospitalLowell, MAHospital
Tufts Medical CenterBoston, MAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Lgh Merrimack Valley Cardiology Associates, Llc408288656922

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. Nathan E Riddell allows following entities to bill medicare on his behalf.
Entity NameSteward Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1629398219
PECOS PAC ID: 2860688728
Enrollment ID: O20101119000007
Entity NameSteward Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1629398219
PECOS PAC ID: 2860688728
Enrollment ID: O20101119000332
Entity NameLgh Merrimack Valley Cardiology Associates, Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1952695884
PECOS PAC ID: 4082886569
Enrollment ID: O20111005000134
Entity NameSound Physicians Of Massachusetts Ii Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1306376397
PECOS PAC ID: 9436421567
Enrollment ID: O20170823003703

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. Nathan E Riddell 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
Nathan E Riddell, MD
55 Lake Ave N,
Worcester, MA 01655-0002

Ph: (508) 334-1000
Nathan E Riddell, MD
55 Lake Ave N,
Worcester, MA 01655-0002

Ph: (508) 334-1000

Reviews and Comments


Internal Medicine Doctors in Worcester, MA

Dr. Adepeju Gbadebo Champion, M.D.
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 55 Lake Ave N, Worcester, MA 01655
Phone: 508-334-2731    Fax: 774-442-4672
Madaiah Lokeshwari, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 123 Summer St, Worcester, MA 01608
Phone: 508-363-6849    
Sowmya Korapati,
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 55 Lake Ave N, Worcester, MA 01655
Phone: 508-334-3550    Fax: 774-442-6715
Irma Hashmi, DO
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 55 Lake Ave N, Worcester, MA 01655
Phone: 508-334-1000    
Dr. Madhav Sharma, MD
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 123 Summer St, Worcester, MA 01608
Phone: 508-363-5438    
Daniel M Steigman, MD
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 123 Summer Street, Suite 390, Worcester, MA 01608
Phone: 508-368-3120    Fax: 508-368-3121
Dr. Julia D Andrieni, M.D.
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 55 Lake Ave N, Department Of General Medicine, Worcester, MA 01655
Phone: 508-334-2731    

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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