Guilherme Marmontel Nasi, M.D.
Advanced Heart Failure and Transplant Cardiology Physician · Dover, NH
Guilherme Marmontel Nasi, M.D. is an advanced heart failure and transplant cardiology physician with a practice address in Dover, New Hampshire, and NPI 1639526825, issued on May 18, 2016. Check the license (New Hampshire 23749, as entered in NPPES) on the New Hampshire Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Guilherme Marmontel Nasi
- Credential
- M.D.
- Primary taxonomy
- Advanced Heart Failure and Transplant Cardiology Physician 207RA0001X
- License numbers
- 23749 NH
1016187 MA
Self-reported in NPPES; status is on the state search - Practice location
- 19 Old Rollinsford RD Bldg B, Dover, NH 03820
- Phone
- (603) 516-4265
- Enumerated
- May 18, 2016
- Record last updated
- Sep 10, 2023
- Medicare enrollment
- Enrolled (PECOS I20230725002751); accepts Medicare assignment
- Entity
- Type 1 · individual
2 nearest advanced heart failure and transplant cardiology physician records → All 3 in New Hampshire → Look up another NPI →
Also registered at 19 Old Rollinsford RD Bldg B
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Dhrubajyoti Bandyopadhyay, MBBS, MDCardiovascular Disease Physician1417478793
- Kristina Cliffe, APRNFamily Nurse Practitioner1689073603
- Emmalie Connor, APRNNurse Practitioner1023559093
- Mariana Day, APRNFamily Nurse Practitioner1285300848
- Husam Farah, MDCardiovascular Disease Physician1922043934
- Sunny Fenn McNally, APRNAdult Health Nurse Practitioner1558576140
Verify Guilherme Marmontel Nasi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Hampshire Board of Medicine
Search for license 23749Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
9% fewer Medicare Part D claims than the average advanced heart failure and transplant cardiology physician in 2024
1,797 Medicare Part D claims for 241 beneficiaries, against an average of 1,965 among the 1,124 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims.
Most prescribed
- Metoprolol Succinate265 claims
- Eliquis173 claims
- Spironolactone129 claims
- Jardiance123 claims
- Furosemide111 claims
- Atorvastatin Calcium109 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $97.16
4 payments; by number, the most common kind was food and beverage; the largest payer was Zoll Services LLC (a/k/a Zoll LifeCor Corp). The 1,027 providers of this specialty with any payment received $10,265.85 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Massachusetts General Physicians Organization IncBoston, MA
- Wentworth Douglass Physician CorporationDover, NH
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Advanced Heart Failure and Transplant Cardiology Physician providers in New Hampshire
There are 3 advanced heart failure and transplant cardiology physician records in New Hampshire.
All 3 in New Hampshire → Every provider in Dover → Advanced Heart Failure and Transplant Cardiology Physician nationwide →
The 2 advanced heart failure and transplant cardiology physician records with the nearest ZIP codes
- Alan Kono, M.D.Lebanon, NH 037561821104803
- Harjot SinghPeterborough, NH 034581003109372
Common questions
What is Guilherme Marmontel Nasi, M.D.'s NPI number?
Guilherme Marmontel Nasi, M.D.'s National Provider Identifier (NPI) is 1639526825, issued on May 18, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Guilherme Marmontel Nasi, M.D. located?
The NPPES record lists a practice address at 19 Old Rollinsford RD Bldg B, Dover, NH, 03820. Phone: (603) 516-4265. Providers update this record themselves, so call before visiting.
How can I verify Guilherme Marmontel Nasi, M.D.'s license?
NPPES lists New Hampshire license number 23749, as entered by the provider. Search the New Hampshire Board of Medicine at https://www.oplc.nh.gov/board-medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Guilherme Marmontel Nasi, M.D. prescribe under Medicare Part D?
In 2024, Guilherme Marmontel Nasi, M.D. had 1,797 Medicare Part D claims for 241 beneficiaries; the average among advanced heart failure and transplant cardiology physician prescribers was 1,965. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.