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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (12)

The overall average patient rating of Dr. John Mascarenhas, Hematology is Excellent. Dr. Mascarenhas has been reviewed by 31 patients who have provided 12 comments. The rating is 5 out of 5 stars.

Patient Ratings
Ease of Appointment 5.0
Promptness 4.3
Courteous Staff 4.6
Accurate Diagnosis 4.9
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 4.9

Specialties & Research

Dr. John Mascarenhas, MD is board certified in Internal Medicine, Hematology, and Medical Oncology.

  • He has special expertise in 15 areas:
  • Acute Myeloid Leukemia
  • Bone Marrow and Lymphatic Tissue Cancer (Hematologic Neoplasm)
  • Cancer
  • Chronic B-Cell Lymphocytic Leukemia
  • Chronic Myeloid Leukemia
  • Chronic Myelomonocytic Leukemia
  • Clinical Research
  • Deep Vein Thrombosis
  • Hepatitis C
  • Leukemia
  • Lymphoma
  • Multiple Myeloma (Cancer of Plasma Cells)
  • Myelodysplastic Syndromes
  • Myeloproliferative Disorders
  • Organ Transplantation

Education & Awards

Dr. Mascarenhas graduated from New York Medical College, Valhalla. He has 3 awards.

Patients' Choice 5th Anniversary Award (2012)
Patients' Choice Award (2008 - 2012, 2014)
Compassionate Doctor Recognition (2010 - 2012, 2014)


Dr. Mascarenhas has 2 hospital affiliations:

  • Montefiore Medical Center 
  • Mt Sinai Hospital 


  • French
  • Arabic
  • German
  • Korean
  • Spanish
  • Portuguese
  • Chinese

> > > > Dr. John Mascarenhas, MD

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Additional Information
Dr. John Mascarenhas MD is a male Internist, has 9 years of experience and practices in Internal Medicine, Hematology, and Medical Oncology.
Where does Dr. John Mascarenhas practice?
Dr. John Mascarenhas has 1 office location.
Dr. John Mascarenhas practices Internal Medicine, Hematology, and Medical Oncology near New York, NY.
See New York Internists, New York Hematologists, and New York Oncologists.