Michael Ghiassi, DO
Internal Medicine Physician · Riverhead, NY
Michael Ghiassi, DO is an internal medicine physician with a practice address in Riverhead, New York, and NPI 1255950440, issued on Apr 8, 2020. Check the license (New York 322416, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Michael Ghiassi
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 322416 NY
OS024395 PA
Self-reported in NPPES; status is on the state search - Practice location
- 1 Heroes Way, Riverhead, NY 11901
- Phone
- (631) 548-6000
- Enumerated
- Apr 8, 2020
- Record last updated
- Feb 4, 2025
- Medicare enrollment
- Enrolled (PECOS I20250305001407); accepts Medicare assignment
- Medical or professional school
- Lincoln Memorial University Medical Department, 2019
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 12,067 in New York → Look up another NPI →
Also registered at 1 Heroes Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Orseola Arapi, MDStudent in an Organized Health Care Education/Training Program1003610023
- Chloe Argenziano, PA-CSurgical Physician Assistant1871475889
- Kian AvillaStudent in an Organized Health Care Education/Training Program1518807999
- Maria AzimInternal Medicine Physician1750969895
Verify Michael Ghiassi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 322416Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
16 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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.
Bills Medicare through 2 group practices
- Abington Memorial HospitalAbington, PA
- Aria Health Physician ServicesPhiladelphia, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Ghiassi among 12,067 internal medicine physician records in New York
Michael Ghiassi, DO is one of 12,067 internal medicine physician records with a practice address in New York. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 87% of them.
- NPI issued2020 · 87% of these records are older, 9% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2019 · median 2002 among the 7,221 with a school on file
- Record last updated2025 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
16 internal medicine physician records list a practice address in Riverhead
They are 16 of the 982 NPPES records with a practice address in Riverhead, and 12,067 internal medicine physician records in New York.
All 12,067 in New York → Every provider in Riverhead → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Maria AzimRiverhead, NY 119011750969895
- Afzal ButtRiverhead, NY 119011083653794
- Eugenio Crisostomo, M.D.Riverhead, NY 119011225099625
- Maureen Crowley, MD, MPHRiverhead, NY 119011346324209
- Michael Dempsey, M.D.Riverhead, NY 119011770508079
- Marie-Jose Dorval-Dorcely, M.DRiverhead, NY 119011093894446
- Laura Gilmartin, M.D.Riverhead, NY 119011134296247
- William Kornrich, MDRiverhead, NY 119011144332198
Common questions
What is Michael Ghiassi, DO's NPI number?
Michael Ghiassi, DO's National Provider Identifier (NPI) is 1255950440, issued on Apr 8, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Michael Ghiassi, DO located?
The NPPES record lists a practice address at 1 Heroes Way, Riverhead, NY, 11901. Phone: (631) 548-6000. Providers update this record themselves, so call before visiting.
How can I verify Michael Ghiassi, DO's license?
NPPES lists New York license number 322416, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Michael Ghiassi, DO prescribe under Medicare Part D?
In 2024, Michael Ghiassi, DO had 16 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. 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.