Mr Guilherme Marmontel Nasi, MD - Medicare Internal Medicine in Dover, NH

Mr Guilherme Marmontel Nasi, MD is a medicare enrolled "Internal Medicine - Advanced Heart Failure And Transplant Cardiology" physician in Dover, New Hampshire. His current practice location is 19 Old Rollinsford Rd Bldg B, Dover, New Hampshire. You can reach out to his office (for appointments etc.) via phone at (603) 516-4265.

Mr Guilherme Marmontel Nasi is licensed to practice in New Hampshire (license number 23749) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1639526825.

Contact Information

Mr Guilherme Marmontel Nasi, MD
19 Old Rollinsford Rd Bldg B,
Dover, NH 03820-2807
(603) 516-4265
Not Available

Map and Direction




Physician's Profile

Full NameMr Guilherme Marmontel Nasi
GenderMale
SpecialityInternal Medicine - Advanced Heart Failure And Transplant Cardiology
Location19 Old Rollinsford Rd Bldg B, Dover, New Hampshire
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1639526825
  • Provider Enumeration Date: 05/18/2016
  • Last Update Date: 09/10/2023
  Medicare PECOS Information:
  • PECOS PAC ID: 6002143047
  • Enrollment ID: I20230725002751

Medical Identifiers

Medical identifiers for Mr Guilherme Marmontel Nasi such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1639526825NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RA0001XInternal Medicine - Advanced Heart Failure And Transplant Cardiology 1016187 (Massachusetts)Secondary
207RC0000XInternal Medicine - Cardiovascular Disease 23749 (New Hampshire)Secondary
207RA0001XInternal Medicine - Advanced Heart Failure And Transplant Cardiology 23749 (New Hampshire)Primary

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. Mr Guilherme Marmontel Nasi allows following entities to bill medicare on his behalf.
Entity NameWentworth Douglass Physician Corporation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1447352430
PECOS PAC ID: 5496749848
Enrollment ID: O20040409000433

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. Mr Guilherme Marmontel Nasi 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
Mr Guilherme Marmontel Nasi, MD
Po Box 412503,
Boston, MA 02241-2503

Ph: (617) 726-3884
Mr Guilherme Marmontel Nasi, MD
19 Old Rollinsford Rd Bldg B,
Dover, NH 03820-2807

Ph: (603) 516-4265

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).

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