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Dr. John Mascarenhas, MD
Medical Oncology* Age 53
Dr. John Mascarenhas, MD
5.0 (1 Ratings)

Offers telehealth

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Dr. John Mascarenhas, MD is a Medical Oncologist in New York, NY.
Dr. John Mascarenhas, MD
5.0 (1 Ratings)
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Dr. John Mascarenhas, MD

Medical Oncology* Age 53
New York, NY
Accepting new patients

Offers telehealth

Dr. John Mascarenhas, MD is a Medical Oncologist in New York, NY.
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About Dr. John Mascarenhas, MD

Dr. John Mascarenhas, MD is a Medical Oncologist in New York, NY. Dr. Mascarenhas currently practices at Ruttenberg Treatment Center and is affiliated with Mount Sinai Hospital. Dr. Mascarenhas has experience treating conditions like Myeloproliferative Disorders, Thrombocytosis, Chronic Myeloid Leukemia (CML), Polycythemia Rubra Vera, Myelodysplastic Syndromes, Bleeding Disorders, Chronic Myelomonocytic Leukemia and Acute Leukemia among other conditions at varying frequencies. Dr. Mascarenhas's office accepts new patients and telehealth appointments. Dr. Mascarenhas is board certified in Hematology and accepts multiple insurance plans.

Offers Telehealth

This provider offers telehealth appointments. Call the office to schedule.

Explains Conditions Well

Patients said this doctor explains conditions well.

Trustworthy

Patients said this doctor is trustworthy.

Friendly Staff

Patients said the staff was friendly.

Easy Scheduling

Patients said scheduling was easy.

Where Dr. John Mascarenhas, MD Sees Patients

  1. 1 The Ruttenberg Treatment Center
    1470 Madison Ave Fl 3, New York, NY 10029
    Monday
    09:00 - 17:00
    Tuesday
    09:00 - 17:00
    Wednesday
    09:00 - 17:00
    Thursday
    09:00 - 17:00
    Friday
    09:00 - 17:00

Experience and Background Check

Myeloproliferative Disorders
Thrombocytosis
Chronic Myeloid Leukemia (CML)
Myeloproliferative Disorders
Thrombocytosis
Chronic Myeloid Leukemia (CML)
Polycythemia Rubra Vera
Myelodysplastic Syndromes
Bleeding Disorders
Chronic Myelomonocytic Leukemia
Acute Leukemia
Pancytopenia
Anemia
  • View other providers who treat Anemia
Acute Promyelocytic Leukemia
Acute Myeloid Leukemia
Neutropenia
Coagulation Disorders
Leukocytosis
Acute Lymphoid Leukemia
Mast Cell Diseases
Bone Marrow Biopsy
Breast Cancer
Osteosarcoma
Venous Embolism and Thrombosis
Small Intestine Cancer
Multiple Myeloma
Immune Thrombocytopenia
Neuroendocrine Tumors
Skin Cancer
Acquired Hemolytic Anemia
Acute Monocytic and Monoblastic Leukemia
Acute Myeloblastic Leukemia Type 3
Acute Myeloid Leukemia Multilineage Dysplasia
Acute Myeloid Leukemia with 11q23 Abnormality
Acute Myelomonocytic Leukemia
Acute Panmyelosis with Myelofibrosis
Amyloidosis
Anal and Rectal Cancer
Anaplastic Large Cell Lymphoma
Anaplastic Large Cell Lymphoma, ALK Positive
Antiphospholipid Syndrome (APS)
Astrocytoma
Basal Cell Carcinoma
Benign Neoplasm of Brain
Biliary Tract Cancer
Bladder Cancer
Blood Disorders in Pregnancy
Bone Cancer
Brain Cancer
Breast Lump
Cancer of Cerebral Meninges
Central Nervous System Lymphoma
Chordoma
  • View other providers who treat Chordoma
Chronic Lymphocytic Leukemia
Coagulation Defects in Pregnancy and Postpartum
Colon Cancer
Colorectal Cancer
Constitutional Aplastic Anemia
Cranial Nerve Cancer
Deep Vein Thrombosis (DVT)
Diffuse Large B-Cell Lymphoma
Drug Induced Aplastic Anemia
Duodenal Cancer
Endocrine Gland Cancer
Ewing's Sarcoma
Eye Cancer
Gallbladder and Biliary Tract Cancer
Head and Neck Cancer
Hemochromatosis
Hemophilia
Hemophilia A
Hodgkin's Disease
Hypercoagulable State
Hypothalamus Cancer
Immune Thrombocytopenic Purpura (ITP)
Kidney Cancer
Laryngeal Cancer
Leukocytopenia
Liver Cancer
Lung Cancer
Lymphocytopenia
Lymphocytosis
Lymphoma
  • View other providers who treat Lymphoma
Lymphosarcoma
Macroglobulinemia (incl. Waldenstrom's )
Malignant Pituitary Gland Tumor
Mantle Cell Lymphoma
Marginal Zone Lymphoma
Maternal Anemia
Mediastinal B-Cell Lymphoma
Medulloblastoma
Melanoma
  • View other providers who treat Melanoma
Metastatic Respiratory System Cancer
Monoclonal Gammopathy of Uncertain Significance
Nodular Lymphoma
Non-Hodgkin's Lymphoma
Nose Cancer
Oral Cancer
Ovarian Cancer
Paroxysmal Nocturnal Hemoglobinuria
Pernicious Anemia
Pineal Region Tumors
Pituitary Gland Cancer
Pituitary Tumor
Primary Central Nervous System Lymphoma
Primary Hypercoagulable State
Prostate Cancer
Protein Deficiency Anemia
Purpura
  • View other providers who treat Purpura
Qualitative Platelet Defects (incl. Glanzmann's Thrombasthenia)
Reticulosarcoma
Retroperitoneum Cancer
Schwannoma
Secondary Malignancies
Sickle Cell Disease
Sickle Cell Hemoglobin SS Disease
Spinal Cord Tumor
Squamous Cell Carcinoma of Skin
Stomach and Small Intestine Cancer
Stomach Cancer
Systemic Amyloidosis
Thalassemia
Thalassemia Minor
Throat Cancer (Nasopharyngeal)
Thyroid Cancer
Upper Digestive Tract Cancer
Urinary Tract Cancer
Uterine Cancer
Vitamin B Deficiency
Vitamin B12 Anemia
Vitamin B12 Deficiency
von Willebrand Disease
Anemia and Iron Deficiency Screening
Bone Marrow Evaluation
Erythropoietin Test
Leukemia Diagnostic Evaluations
Lymphoma Evaluation
Plasmapheresis
Thoracentesis

What Patients Say

Likelihood to recommend Dr. Mascarenhas
5.0
Based on 1 Reviews
5 Stars (1)
4 Stars (0)
3 Stars (0)
2 Stars (0)
1 Star (0)

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How likely are you to recommend Dr. Mascarenhas?

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Patient Reviews
May 09, 2025
Caring and brilliant physician. Never rushes a patient and explain options fully. One of the best if not the best!
Diane S — May 09, 2025
See more reviews on Healthgrades

Accepted Insurance Plans

* Please verify this information when scheduling an appointment.
  • Choice Care PPO
  • Blue Priority (Select Network)-NY
    National (BlueCard Basic) PPO
    Empire (Select Network)-NY POS
    National (BlueCard) PPO
    Blue Access (Select Network)-NY
  • Blue Card
    Blue Card PPO
  • Personal Choice PPO
  • MultiPlan PPO
  • Choice Plus
  • Cigna
    Cigna PPO
    Open Access Plus
  • Choice Care (Humana)
  • First Health (Coventry Health Care)
    First Health (Coventry Health Care) PPO
  • Personal Choice
  • Curative PPO Plus
    Curative
    Curative PPO
    Curative EPO
  • Select
    Choice Plus POS II
    Aetna
  • HealthyBlue 2.0
    HealthyBlue Advantage

Meet Dr. John Mascarenhas, MD

Biography
  • Dr. John Mascarenhas, MD is a medical oncologist in New York, NY. He specializes in Medical Oncology and Hematology & Oncology.
Biography
Specialties*
Hematology & Oncology
Medical Oncology
Specialties*
  • *Sharecare does not verify qualifications for medical specialties. Please verify your provider's specialty and qualifications directly with your provider and applicable medical board.
Training & Medical Education
Board Certifications
  • Hematology
Board Certifications
What’s a board certification and why is it important that my provider has one?

A board certification represents a provider’s dedication to ongoing training in one or more specialties, including the completion of intensive exams. While not all specialties have board certifications, if your provider does have one they’ve taken the extra step to master their specialty and to keep up with the latest advancements in their field.
Residency Hospital
  • Rhode Island Hospital Brown University
    2005
Residency Hospital
Fellowship Hospital
  • Mt Sinai School of Medicine Hospital
    2008
Fellowship Hospital
Common Questions and Answers
Responses are sourced directly from patients.
Does Dr. Mascarenhas communicate via email?
2 users said yes.
Yes
(2)
No
(1)
Does Dr. Mascarenhas offer telehealth services or virtual visits?
No users said yes.
Yes
(0)
No
(2)
Does Dr. Mascarenhas offer an online patient portal?
No users said yes.
Yes
(0)
No
(2)
Does Dr. Mascarenhas have free onsite parking?
No users said yes.
Yes
(0)
No
(1)
Does Dr. Mascarenhas offer weekend visits?
No users said yes.
Yes
(0)
No
(2)
Does Dr. Mascarenhas offer evening visits?
No users said yes.
Yes
(0)
No
(2)
Does Dr. Mascarenhas specialize in working with children or adolescents?
No responses yet.
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No
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Does Dr. Mascarenhas specialize in working with seniors?
No responses yet.
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Does Dr. Mascarenhas specialize in couples therapy?
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Does Dr. Mascarenhas specialize in working with LGBTQ+ community?
No responses yet.
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Does Dr. Mascarenhas accept insurance?
No responses yet.
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FAQs About Dr. Mascarenhas's Practice

Find contact information here to make an appointment.

A list of accepted insurance providers is available on the Sharecare insurance check. It is always a good idea to verify your insurance when making an appointment.

New patients are generally accepted by Dr. John Mascarenhas, MD. To arrange an appointment, call the number on Dr. Mascarenhas's profile.

Dr. Mascarenhas frequently treats the following conditions: Myeloproliferative Disorders, Thrombocytosis, Chronic Myeloid Leukemia (CML), Polycythemia Rubra Vera, Myelodysplastic Syndromes, Bleeding Disorders, Chronic Myelomonocytic Leukemia and Acute Leukemia. See more on Sharecare.

Dr. John Mascarenhas, MD is affiliated with Mount Sinai Hospital.

Yes, Dr. John Mascarenhas, MD holds board certification in Hematology.

Hospitals Where Dr. John Mascarenhas, MD Practices

  • Mount Sinai Hospital

    1 Gustave L Levy Pl, New York, NY

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