Individual Healthcare Provider
Guilherme Marmontel Nasi, M.D.
Provider's NPPES record last updated: September 10, 2023
Overview
- Entity Type
- Individual Healthcare Provider
- NPI
- 1639526825
- Primary Specialty
- Internal Medicine — Advanced Heart Failure and Transplant Cardiology
- Practice Location
- Dover, New Hampshire
- Sole Proprietor
- No
Federal Screening
NPISignal checked this NPI against federal exclusion sources. Results below are based on the NPI number itself — an identifier match, not a name match.
List of Excluded Individuals/Entities (LEIE)
HHS Office of Inspector General
No potential match was identified in NPISignal's indexed List of Excluded Individuals/Entities (LEIE) records as of 2026-09-10.
- Source data
- September 10, 2026
- Records indexed
- 84,001
- Screened
- Sep 18, 2026, 8:28 AM UTC
This reflects only the records NPISignal currently holds and the identity information supplied. It is not a verification of eligibility, licensure, or compliance. Verify decisions that matter against the authoritative source.
SAM.gov Exclusions
U.S. General Services Administration
SAM.gov Exclusions was not checked.
SAM.gov screening is not configured on this deployment. No SAM check has been performed.
- Screened
- Not checked
This is an NPI-based check only. NPISignal does not publish name-based exclusion matches on a provider profile. A shared or similar name is a lead that requires human review, not an identification, and this page is not the place to make one. Run a name-based screening below to see potential matches with the reasons for each.
This reflects only the records NPISignal currently holds and the identity information supplied. It is not a verification of eligibility, licensure, or compliance. Verify decisions that matter against the authoritative source.
Searches OIG LEIE and SAM.gov by name and reviews every potential match.
Specialties & Taxonomies
- Primary
Internal Medicine
Advanced Heart Failure and Transplant Cardiology
Allopathic & Osteopathic Physicians
Specialists in Advanced Heart Failure and Transplant Cardiology would participate in the inpatient and outpatient management of patients with advanced heart failure across the spectrum from consideration for high-risk cardiac surgery, cardiac transplantation, or mechanical circulatory support, to pre-and post-operative evaluation and management of patients with cardiac transplants and mechanical support devices, and end-of-life care for patients with end-stage heart failure.
Taxonomy code 207RA0001X Internal Medicine
Cardiovascular Disease
Allopathic & Osteopathic Physicians
An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.
Taxonomy code 207RC0000X
Provider-Reported License Information
- Internal Medicine (New Hampshire)
- 23749
- Internal Medicine (Massachusetts)
- 1016187
- Internal Medicine (New Hampshire)
- 23749
Practice Locations
Practice Location
19 Old Rollinsford Rd Bldg B
Dover, New Hampshire 03820-2807
Phone: (603) 516-4265
Additional Practice Location
55 Fruit St
Boston, Massachusetts 02114-2696
Phone: (617) 724-9254
Record Information
- Enumeration Date
- May 18, 2016
- Provider's NPPES Record Last Updated
- September 10, 2023
- Certification Date
- September 10, 2023
- Deactivation Date
- January 20, 2017
- Reactivation Date
- October 13, 2017
- NPISignal NPPES Dataset
- August 2026
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