Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Guilherme Marmontel Nasi, M.D.

Advanced Heart Failure and Transplant Cardiology Physician in Dover, NH · enumerated 2016.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1639526825

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Registry record

Entity type Individual (Type 1)

Name Mr. Guilherme Marmontel Nasi

Credential M.D.

Sex Male

Practice address 19 Old Rollinsford Rd Bldg B, Dover, NH, 03820

Phone (603) 516-4265

Enumeration date May 18, 2016

Last updated in NPPES Sep 10, 2023

Taxonomy & licenses

207RA0001X Advanced Heart Failure and Transplant Cardiology Physician Allopathic & Osteopathic Physicians · License 1016187 (MA) Secondary

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 23749 (NH) Secondary

207RA0001X Advanced Heart Failure and Transplant Cardiology Physician Allopathic & Osteopathic Physicians · License 23749 (NH) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Guilherme Marmontel Nasi practice?

The practice location on file with NPPES is in Dover, NH. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Guilherme Marmontel Nasi?

The National Provider Identifier (NPI) for Guilherme Marmontel Nasi is 1639526825, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Husam Farah Cardiovascular Disease Physician · Dover, NH NPI 1922043934 Sachin Saksena Cardiovascular Disease Physician · Dover, NH NPI 1720172646 Patricia Moxham-Fisher Acute Care Nurse Practitioner · Dover, NH NPI 1255407391 Sunny Fenn Mcnally Adult Health Nurse Practitioner · Dover, NH NPI 1558576140 Rodrigo Mendirichaga Magana Interventional Cardiology Physician · Dover, NH NPI 1225443963 Kristin Passeri Family Nurse Practitioner · Dover, NH NPI 1861808354 Kristina Cliffe Family Nurse Practitioner · Dover, NH NPI 1689073603 Daniel Pipilas Cardiovascular Disease Physician · Dover, NH NPI 1285083568

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-09-10.