Claes M Nilsson, MD - Medicare Internal Medicine in Dedham, MA

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Claes M Nilsson, MD is a medicare enrolled "Internal Medicine" physician in Dedham, Massachusetts. He went to Yale University School Of Medicine and graduated in 1973 and has 51 years of diverse experience with area of expertise as Internal Medicine. He is a member of the group practice Vantage Healthcare Llc and his current practice location is 990 Washington St, Suite 203, Dedham, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (413) 543-6820.

Claes M Nilsson is licensed to practice in Massachusetts (license number 53091) 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 1912006065.

Contact Information

Claes M Nilsson, MD
990 Washington St, Suite 203,
Dedham, MA 02026-6714
(413) 543-6820
(781) 326-1384

Map and Direction




Physician's Profile

Full NameClaes M Nilsson
GenderMale
SpecialityInternal Medicine
Experience51 Years
Location990 Washington St, Dedham, 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:
  • Claes M Nilsson attended and graduated from Yale University School Of Medicine in 1973
  NPI Data:
  • NPI Number: 1912006065
  • Provider Enumeration Date: 09/22/2006
  • Last Update Date: 10/19/2022
  Medicare PECOS Information:
  • PECOS PAC ID: 2365435351
  • Enrollment ID: I20040406000501

Medical Identifiers

Medical identifiers for Claes M Nilsson such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1912006065NPI-NPPES
110045324/AMedicaidMA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 53091 (Massachusetts)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
CaretendersNeedham heights, MAHome health agency
Bayada Home Health Care, IncDedham, MAHome health agency
Compassionate Care HospiceWoburn, MAHospice

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Vantage Healthcare Llc822436119184

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. Claes M Nilsson allows following entities to bill medicare on his behalf.
Entity NameGenesis Eldercare Physician Services Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1104819259
PECOS PAC ID: 9830002534
Enrollment ID: O20040824000702
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 NameMassachusetts Acute Care Specialists Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1306134812
PECOS PAC ID: 9234303082
Enrollment ID: O20111114000448
Entity NameGps Physician Group, Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1881109452
PECOS PAC ID: 9739447400
Enrollment ID: O20180205002045
Entity NameVantage Healthcare Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1366903551
PECOS PAC ID: 8224361191
Enrollment ID: O20190607000976
Entity NamePai Participant Ma Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1932984317
PECOS PAC ID: 9537513684
Enrollment ID: O20230925000533

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. Claes M Nilsson 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
Claes M Nilsson, MD
819 Worcester St, Ste 3,
Springfield, MA 01151-1045

Ph: (413) 543-6820		Claes M Nilsson, MD
990 Washington St, Suite 203,
Dedham, MA 02026-6714

Ph: (413) 543-6820

Reviews and Comments


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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.