Ioannis Mastoris, MD
Advanced Heart Failure and Transplant Cardiology Physician · Boston, MA
Ioannis Mastoris, MD is an advanced heart failure and transplant cardiology physician with a practice address in Boston, Massachusetts, and NPI 1124403209, issued on Jul 30, 2015. Check the license (Massachusetts 291827, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Ioannis Mastoris
- Credential
- MD
- Primary taxonomy
- Advanced Heart Failure and Transplant Cardiology Physician 207RA0001X
- License numbers
- 291827 MA
23750 NH
Self-reported in NPPES; status is on the state search - Practice location
- 55 Fruit St, Boston, MA 02114
- Phone
- (617) 643-7972
- Enumerated
- Jul 30, 2015
- Record last updated
- May 1, 2023
- Medicare enrollment
- Enrolled (PECOS I20220901002869); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest advanced heart failure and transplant cardiology physician records → All 38 in Massachusetts → Look up another NPI →
Also registered at 55 Fruit St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Taimur AbbasiInternal Medicine Physician1841673522
- Megan Abbott, MDAnesthesiology Physician1730839333
- Moustafa AbdallaStudent in an Organized Health Care Education/Training Program1952046062
- Shadi Abdar Esfahani, MD, MPHDiagnostic Radiology Physician1497137590
Verify Ioannis Mastoris in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 291827Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
49% fewer Medicare Part D claims than the average advanced heart failure and transplant cardiology physician in 2024
1,007 Medicare Part D claims for 150 beneficiaries, against an average of 1,965 among the 1,124 providers of this specialty who prescribed in Part D. Brand-name drugs were 39% of claims.
Most prescribed
- Entresto148 claims
- Metoprolol Succinate148 claims
- Spironolactone117 claims
- Jardiance107 claims
- Furosemide51 claims
- Atorvastatin Calcium48 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: $578.85
5 payments; by number, the most common kind was food and beverage; the largest payer was Impulse Dynamics (USA) Inc. 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 one group practice
- Massachusetts General Physicians Organization IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ioannis Mastoris among 38 advanced heart failure and transplant cardiology physician records in Massachusetts
Ioannis Mastoris, MD is one of 38 advanced heart failure and transplant cardiology physician records with a practice address in Massachusetts. 89% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 74% of them.
- NPI issued2015 · 74% of these records are older, 24% newer
- In a Medicare fileYes · 89% of these records are
- In the CMS Doctors and Clinicians fileYes · 89% of these records are
- Graduated2011 · median 2008 among the 34 with a school on file
- Record last updated2023 · 45% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RA0001X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Advanced Heart Failure and Transplant Cardiology Physician providers in Massachusetts
There are 38 advanced heart failure and transplant cardiology physician records in Massachusetts.
All 38 in Massachusetts → Every provider in Boston → Advanced Heart Failure and Transplant Cardiology Physician nationwide →
The 8 advanced heart failure and transplant cardiology physician records with the nearest ZIP codes
- Kemar Brown, M.D.Boston, MA 021141790147395
- Stephanie Moore, M.D.Boston, MA 021141740261486
- Van-Khue Ton, MD, PHDBoston, MA 021141497982938
- Daniel Zlotoff, M.D.Boston, MA 021141780943803
- Aws Almufleh, MBBS, MPHBoston, MA 021151710530506
- Elizabeth Blume, MDBoston, MA 021151780675777
- Jacinthe Boulet, MDCMBoston, MA 021151588311526
- Kevin Daly, MDBoston, MA 021151134387665
Common questions
What is Ioannis Mastoris, MD's NPI number?
Ioannis Mastoris, MD's National Provider Identifier (NPI) is 1124403209, issued on Jul 30, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Ioannis Mastoris, MD located?
The NPPES record lists a practice address at 55 Fruit St, Boston, MA, 02114. Phone: (617) 643-7972. Providers update this record themselves, so call before visiting.
How can I verify Ioannis Mastoris, MD's license?
NPPES lists Massachusetts license number 291827, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ioannis Mastoris, MD prescribe under Medicare Part D?
In 2024, Ioannis Mastoris, MD had 1,007 Medicare Part D claims for 150 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.