Gregory A Johnson, MD - Medicare Internal Medicine in Somerville, MA

Gregory A Johnson, MD is a medicare enrolled "Internal Medicine" physician in Somerville, Massachusetts. He went to Warren Alpert Medical School Of Brown University and graduated in 1993 and has 31 years of diverse experience with area of expertise as Internal Medicine. He is a member of the group practice Atrius Health Inc and his current practice location is 40 Holland St, Harvard Vanguard Medical Associates, Somerville, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (617) 629-6350.

Gregory A Johnson is licensed to practice in Massachusetts (license number 151587) 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 1942213509.

Contact Information

Gregory A Johnson, MD
40 Holland St, Harvard Vanguard Medical Associates,
Somerville, MA 02144-2705
(617) 629-6350
Not Available

Map and Direction




Physician's Profile

Full NameGregory A Johnson
GenderMale
SpecialityInternal Medicine
Experience31 Years
Location40 Holland St, Somerville, 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:
  • Gregory A Johnson attended and graduated from Warren Alpert Medical School Of Brown University in 1993
  NPI Data:
  • NPI Number: 1942213509
  • Provider Enumeration Date: 08/14/2006
  • Last Update Date: 02/18/2021
  Medicare PECOS Information:
  • PECOS PAC ID: 2264452523
  • Enrollment ID: I20051201000118

Medical Identifiers

Medical identifiers for Gregory A Johnson such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1942213509NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 151587 (Massachusetts)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Northeast Hospital CorporationBeverly, MAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Atrius Health Inc47895886411130

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. Gregory A Johnson allows following entities to bill medicare on his behalf.
Entity NameAtrius Health Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1871639914
PECOS PAC ID: 4789588641
Enrollment ID: O20031121000582

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. Gregory A Johnson 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
Gregory A Johnson, MD
40 Holland St, Harvard Vanguard Medical Associates,
Somerville, MA 02144-2705

Ph: (617) 629-6350
Gregory A Johnson, MD
40 Holland St, Harvard Vanguard Medical Associates,
Somerville, MA 02144-2705

Ph: (617) 629-6350

Reviews and Comments


Internal Medicine Doctors in Somerville, MA

Arturo Villarreal-verdecia, MD
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Ingo H Stubbe, MD
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Ruth P Hertzman-miller, MD
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Phone: 617-591-6300    

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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