John Mascarenhas, MD
Hematology & Oncology Physician · New York, NY
John Mascarenhas, MD is a hematology & oncology physician with a practice address in New York, New York, and NPI 1376719104, issued on May 1, 2008. Check the license (New York 235966, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- John Mascarenhas
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 235966 NY
Self-reported in NPPES; status is on the state search - Practice location
- 1 Gustave L Levy PL, New York, NY 10029
- Phone
- (212) 241-1948
- Enumerated
- May 1, 2008
- Record last updated
- Jul 7, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20081003000012); accepts Medicare assignment
- Medical or professional school
- New York Medical College, 2002
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,163 in New York → Look up another NPI →
Also registered at 1 Gustave L Levy PL
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Erin AbbottStudent in an Organized Health Care Education/Training Program1699587170
- Ghadi AbboudDiagnostic Radiology Physician1740936822
- Richard Abel, M.D.Anesthesiology Physician1508148016
- Jessica Ables, M.D., PH.D.Psychiatry Physician1437543352
- Grant AbrahamsonStudent in an Organized Health Care Education/Training Program1194512590
Verify John Mascarenhas 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 235966Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
42% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
511 Medicare Part D claims for 89 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 43% of claims.
Most prescribed
- Jakafi78 claims
- Allopurinol55 claims
- Acyclovir46 claims
- Hydroxyurea30 claims
- Posaconazole30 claims
- Levofloxacin27 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: $143,688.55
87 payments; by number, the most common kind was consulting fee; the largest payer was Incyte Corporation. The 8,560 providers of this specialty with any payment received $7,481.41 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
- 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).
John Mascarenhas among 1,163 hematology & oncology physician records in New York
John Mascarenhas, MD is one of 1,163 hematology & oncology physician records with a practice address in New York. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 56% of them.
- NPI issued2008 · 56% of these records are older, 38% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2002 · median 2002 among the 833 with a school on file
- Record last updated2008 · 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 207RH0003X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in New York
There are 1,163 hematology & oncology physician records in New York.
All 1,163 in New York → Every provider in New York → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Amit Agarwal, M.D.New York, NY 100291275790826
- Theodora Anagnostou, M.D.New York, NY 100291780026567
- Philippe Chahinian, MDNew York, NY 100291083632871
- Ajai Chari, M.D.New York, NY 100291376560136
- Janice Gabrilove, MDNew York, NY 100291114945946
- Ronald Hoffman, M.D.New York, NY 100291467558932
- Johnson Liu, MDNew York, NY 100291861552903
- Jonathan Schwartz, MDNew York, NY 100291316965148
Common questions
What is John Mascarenhas, MD's NPI number?
John Mascarenhas, MD's National Provider Identifier (NPI) is 1376719104, issued on May 1, 2008. An NPI identifies a provider in billing; it is not a license.
Where is John Mascarenhas, MD located?
The NPPES record lists a practice address at 1 Gustave L Levy PL, New York, NY, 10029. Phone: (212) 241-1948. Providers update this record themselves, so call before visiting.
How can I verify John Mascarenhas, MD's license?
NPPES lists New York license number 235966, 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 John Mascarenhas, MD prescribe under Medicare Part D?
In 2024, John Mascarenhas, MD had 511 Medicare Part D claims for 89 beneficiaries; the average among hematology & oncology physician prescribers was 877. 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.