John Mascarenhas, MD
NPI 1376719104 · Hematology & Oncology Physician · New York, NY
Enrolled with Medicare as Practitioner - Hematology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Mascarenhas, MD is a Hematology & Oncology Physician provider in New York, NY (NPI 1376719104).
Provider details
- NPI number
- 1376719104
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 235966 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
18 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
610 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 476 | $105 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 90 | $129 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 32 | $199 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 12 | $147 |
Typical Medicare-allowed amounts for these services range $105–$199 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ruxolitinib Phosphatebrand: Jakafi | 78 | 19 |
| Allopurinol | 55 | — |
| Acyclovir | 46 | 11 |
| Hydroxyurea | 30 | 17 |
| Posaconazole | 30 | — |
| Levofloxacin | 27 | — |
| Pacritinib Citratebrand: Vonjo | 25 | — |
| Rivaroxabanbrand: Xarelto |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$143,689 across 87 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-05-01
- Last updated
- 2008-07-07
Frequently asked questions
- What is John Mascarenhas's NPI number?
- John Mascarenhas's National Provider Identifier (NPI) is 1376719104, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Mascarenhas's specialty?
- John Mascarenhas is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is John Mascarenhas located?
- John Mascarenhas's practice location on file with NPPES is 1 Gustave L Levy Pl, New York, NY 10029-6500.
- What is John Mascarenhas's phone number?
- The practice phone number listed in the NPPES registry for John Mascarenhas is (212) 241-1948.
- Does John Mascarenhas accept Medicare?
- John Mascarenhas is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Mascarenhas's NPI active?
- Yes — John Mascarenhas's NPI (1376719104) is active in the NPPES registry as of the last update on 2008-07-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.