Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Mr. Guilherme Marmontel Nasi, MD

Individual provider Advanced Heart Failure and Transplant Cardiology Physician · NPI 1639526825

Mr. Guilherme Marmontel Nasi, MD is a Cardiovascular Disease (Cardiology) in Dover, New Hampshire. Qualified in 2013, 13 years ago. Practices with Wentworth Douglass Physician Corporation, a 431-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Massachusetts and New Hampshire.

Years since qualifying
13
Licensed in
MA, NH
In the registry since
2016
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

19 Old Rollinsford Rd Bldg B
Dover, NH 03820-2807
Phone: (603) 516-4265
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 55 Fruit St, Boston, MA 02114-2696 — (617) 724-9254

Specialties & licences

Advanced Heart Failure and Transplant Cardiology Physician (primary) Taxonomy 207RA0001X · Licence 23749 (NH)
Advanced Heart Failure and Transplant Cardiology Physician Taxonomy 207RA0001X · Licence 1016187 (MA)
Cardiovascular Disease Physician Taxonomy 207RC0000X · Licence 23749 (NH)

Record details

NPI number1639526825
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 18, 2016
Last updated in NPPESSeptember 10, 2023
Certification dateSeptember 10, 2023

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCARDIOVASCULAR DISEASE (CARDIOLOGY)
Also practisesADVANCED HEART FAILURE AND TRANSPLANT CARDIOLOGY
Medical schoolOTHER
Graduated 2013 (13 years in practice)
Group practice Wentworth Douglass Physician Corporation — 431 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare