Alexander John Greenstein, M.D.
Surgery Physician · New York, NY
Alexander John Greenstein, M.D. is a surgery physician with a practice address in New York, New York, and NPI 1992964035, issued on Jun 4, 2008. Check the license (New York 60 233708, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Alexander John Greenstein
- Credential
- M.D.
- Primary taxonomy
- Surgery Physician 208600000X
- License number
- 60 233708 NY
Self-reported in NPPES; status is on the state search - Practice location
- 5 E 98TH St, New York, NY 10029
- Phone
- (212) 241-8679
- Enumerated
- Jun 4, 2008
- Record last updated
- Oct 8, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (212) 534-2654
- Medicare enrollment
- Enrolled (PECOS I20100907001013); accepts Medicare assignment
- Medical or professional school
- Js Weill Medical College, Cornell University, 2003
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 5 E 98TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jawad Ahmad, MDHepatology Physician1104898311
- Sarah Ahn, DCChiropractor1023717261
- Anna Akerstedt, PH.D.Clinical Psychologist1831344829
Verify Alexander John Greenstein 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 60 233708Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average surgery physician in 2024
27 Medicare Part D claims for 12 beneficiaries, against an average of 147 among the 20,115 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 one group practice
- Icahn School OF Medicine AT Mount SinaiNew York, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Surgery Physician providers in New York
There are 2,053 surgery physician records in New York.
Other surgery physician records in New York
- Ayman Abadeer, MDBrooklyn, NY1619268869
- Ahmad Abdelaal, MDBronx, NY1255880738
- Hossam Abdou, M.D.New York, NY1093247975
- Alexander Abdurakhmanov, MDBrooklyn, NY1538556196
- Deborah Abeles, M.D.Garden City, NY1063528925
- Sara Abou Azar, M.D.Buffalo, NY1689103541
- Georges Abou-Eid, M.D.Roslyn, NY1518017425
- Ziad Abouezzi, MDPoughkeepsie, NY1831178284
- Mohamad Abouzeid, M.D.Port Jefferson, NY1144464421
- Frederick Achildiev, MDBay Shore, NY1740467737
Common questions
What is Alexander John Greenstein, M.D.'s NPI number?
Alexander John Greenstein, M.D.'s National Provider Identifier (NPI) is 1992964035, issued on Jun 4, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Alexander John Greenstein, M.D. located?
The NPPES record lists a practice address at 5 E 98TH St, New York, NY, 10029. Phone: (212) 241-8679. Providers update this record themselves, so call before visiting.
How can I verify Alexander John Greenstein, M.D.'s license?
NPPES lists New York license number 60 233708, 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 Alexander John Greenstein, M.D. prescribe under Medicare Part D?
In 2024, Alexander John Greenstein, M.D. had 27 Medicare Part D claims for 12 beneficiaries; the average among surgery physician prescribers was 147. 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.