See All Oncologists in New York, NY
Dr. John Mascarenhas, MD Icon-share Share Profile
icon-circle-check
Link Copied!
Profile link copied to clipboard!
Super Profile

Dr. John Mascarenhas, MD

Medical Oncology
5.0 (13)
Map Pin Small New York, NY
Accepting new patients

Offers telehealth

Brought to you by

Overview of Dr. John Mascarenhas, MD

Dr. John Mascarenhas, MD is a Medical Oncology Specialist in New York, NY. They completed their fellowship with Mt Sinai Sch Med Hosp

Dr. Mascarenhas works at Ruttenberg Treatment Center in New York, NY. They frequently treat conditions like Myeloproliferative Disorders, Thrombocytosis and Bone Marrow Biopsy along with other conditions at varying frequencies. They are accepting new patients and accepts Aetna, Anthem and Blue Cross Blue Shield as well as other major insurance plans. Please call ahead to schedule an appointment and to confirm all accepted insurance plans.

Dr. Mascarenhas' Office Locations

  1. 1
    Ruttenberg Treatment Center
    1470 Madison Ave Fl 3, New York, NY 10029 Icon Directions Right Arrow Directions
    Monday
    9:00am - 5:00pm
    Tuesday
    9:00am - 5:00pm
    Wednesday
    9:00am - 5:00pm
    Thursday
    9:00am - 5:00pm
    Friday
    9:00am - 5:00pm

Experience & Treatment Frequency

NEW FEATURE

What is treatment frequency?

Our treatment frequency feature helps you understand howoften a provider performs or treats a specificprocedure/condition compared to other doctors. Providersrank in one of four frequency categories:

Very HighFrequency
HighFrequency
NormalFrequency
May Perform

Specific procedures/conditions that don’t haveenough data are indicated with “May Perform”. We encourageyou to contact the provider with questions about theirexperience.

Search for conditions or procedures.
Myeloproliferative Disorders
Thrombocytosis
Bone Marrow Biopsy
Myeloproliferative Disorders
Thrombocytosis
Bone Marrow Biopsy

Treatment frequency



Many providers have expertise treating multiple conditions or procedures. FindCare uses a variety of data sources to determine which conditions or procedures a provider treats and their level of experience.
Myeloproliferative Disorders Chevron Icon
Thrombocytosis Chevron Icon
Bone Marrow Biopsy Chevron Icon
Acute Leukemia Chevron Icon
Acute Myeloid Leukemia Chevron Icon
Bleeding Disorders Chevron Icon
Chronic Myeloid Leukemia (CML) Chevron Icon
Myelodysplastic Syndromes Chevron Icon
Polycythemia Rubra Vera Chevron Icon
Venous Embolism and Thrombosis Chevron Icon
Acute Lymphoid Leukemia Chevron Icon
Anemia Chevron Icon
  • View other providers who treat Anemia
Anemia and Iron Deficiency Screening Chevron Icon
Bone Marrow Evaluation Chevron Icon
Erythropoietin Test Chevron Icon
Leukemia Diagnostic Evaluations Chevron Icon
Leukocytosis Chevron Icon
Lung Cancer Chevron Icon
Lymphoma Evaluation Chevron Icon
Neutropenia Chevron Icon
Pancytopenia Chevron Icon
Purpura Chevron Icon
  • View other providers who treat Purpura
Vitamin B Deficiency Chevron Icon
Antiphospholipid Syndrome (APS) Chevron Icon
Astrocytoma Chevron Icon
Basal Cell Carcinoma Chevron Icon
Bladder Cancer Chevron Icon
Blood Disorders in Pregnancy Chevron Icon
Bone Cancer Chevron Icon
Brain Cancer Chevron Icon
Breast Cancer Chevron Icon
Central Nervous System Lymphoma Chevron Icon
Cholangiocarcinoma Chevron Icon
Chordoma Chevron Icon
  • View other providers who treat Chordoma
Chronic Lymphocytic Leukemia Chevron Icon
Coagulation Disorders (incl. Hemophilia) Chevron Icon
Colorectal Cancer Chevron Icon
Deep Vein Thrombosis (DVT) Chevron Icon
Gallbladder and Biliary Tract Cancer Chevron Icon
Head and Neck Cancer Chevron Icon
Hemophilia Chevron Icon
Hodgkin's Disease Chevron Icon
Immune Thrombocytopenic Purpura (ITP) Chevron Icon
Kidney Cancer Chevron Icon
Laryngeal Cancer Chevron Icon
Liver Cancer Chevron Icon
Lymphocytosis Chevron Icon
Lymphoma Chevron Icon
  • View other providers who treat Lymphoma
Lymphosarcoma Chevron Icon
Macroglobulinemia (incl. Waldenstrom's ) Chevron Icon
Mast Cell Diseases Chevron Icon
Maternal Anemia Chevron Icon
Medulloblastoma Chevron Icon
Myeloma Chevron Icon
  • View other providers who treat Myeloma
Nodular Lymphoma Chevron Icon
Non-Hodgkin's Lymphoma Chevron Icon
Osteosarcoma Chevron Icon
Ovarian Cancer Chevron Icon
Paroxysmal Nocturnal Hemoglobinuria Chevron Icon
Pituitary Tumor Chevron Icon
Plasmapheresis Chevron Icon
Primary Central Nervous System Lymphoma Chevron Icon
Primary Hypercoagulable State (incl. Factor V Leiden Disease) Chevron Icon
Prostate Cancer Chevron Icon
Qualitative Platelet Defects (incl. Glanzmann's Thrombasthenia) Chevron Icon
Reticulosarcoma Chevron Icon
Schwannoma Chevron Icon
Secondary Malignancies Chevron Icon
Skin Cancer Chevron Icon
Small Intestine Cancer Chevron Icon
Squamous Cell Carcinoma Chevron Icon
Stomach and Small Intestine Cancer Chevron Icon
Stomach Cancer Chevron Icon
Thalassemia Chevron Icon
Thoracentesis Chevron Icon
Throat Cancer (Nasopharyngeal) Chevron Icon
Thyroid Cancer Chevron Icon
Vitamin B12 Deficiency Chevron Icon
von Willebrand Disease Chevron Icon
Check your insurance
    Close Icon
    Please double-check when making an appointment.

    Insurance Accepted

    • Aetna
    • Amerihealth
    • Anthem
    • Blue Cross Blue Shield
    • CareFirst Blue Cross Blue Shield
    • Cigna
    • First Health
    • Humana
    • MultiPlan

    * Please verify this information when scheduling an appointment.

    Ratings & Reviews

    5.0
    Average provider rating
    Based on 13 ratings
    Patient Ratings (13)
    5 Star
    (13)
    4 Star
    (0)
    3 Star
    (0)
    2 Star
    (0)
    1 Star
    (0)
    Leave a review

    How was your appointment with Dr. Mascarenhas?

    Dec 06, 2022
    Can I give him 1000 stars? I've been in his care since 2014 for a Jak2 MPN condition. He is attentive and caring, and most important he listens and shows compassion. He is primary, my go-to physician. He keeps an eye on me, and follows me carefully. I got misty-eyed visiting YouTube videos featuring Q&As with him. A man on the leading edge of medical breakthroughs takes the time to listen and explain is extraordinary. Always asks about my husband, who is not his patient. I love the guy.
    tracy thorne — Dec 06, 2022
    Read more reviews on Healthgrades
    Photo: Dr. John Mascarenhas, MD
    How would you rate your experience with Dr. John Mascarenhas, MD?
    • Likelihood of recommending Dr. Mascarenhas to family and friends

    Dr. Mascarenhas' Office & Staff

    • Ease of scheduling urgent appointments
    • Office environment, cleanliness, comfort, etc.
    • Staff friendliness and courteousness
    • Total wait time (waiting & exam rooms)

    Experience with Dr. Mascarenhas

    • Level of trust in provider's decisions
    • How well provider explains medical condition(s)
    • How well provider listens and answers questions
    • Spends appropriate amount of time with patients

    Tell Us About Yourself

    • Your gender:
    • Your age group:
    • Number of office visits you've had in the last 2 years:

    Finish Here

    • How would you like to confirm your survey information?
      Standard text messaging and data rates may apply.
    Thank you for sharing your feedback about Dr. John Mascarenhas, MD.

    About Dr. John Mascarenhas, MD

    Specialties
    • Medical Oncology
    Specialties
    Languages Spoken
    • English
    Languages Spoken
    Gender
    • Male
    Gender
    NPI Number
    • 1376719104
    NPI Number
    A National Provider Identifier (NPI) is a unique 10-digit identifier issued by the government to healthcare providers.

    Education & Certifications

    Fellowship
    • Mt Sinai Sch Med Hosp
    Fellowship
    Residency
    • Rhode Island Hosp Brown University
    Residency
    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.

    Hospital Affiliations

    • Mount Sinai Hospital

    Frequently Asked Questions

    Dr. John Mascarenhas, MD is accepting new patients on Healthline FindCare. You can check to see if Dr. Mascarenhas is offering online scheduling or call the provider’s office for more information.

    Dr. Mascarenhas has an average wait time of 10 – 15 minutes at their office(s).

    Dr. Mascarenhas has indicated that they do offer telehealth services. Please call the provider’s office at for more information.

    Dr. Mascarenhas works at Ruttenberg Treatment Center in New York, NY. View the full address on Dr. Mascarenhas’s profile.

    Dr. Mascarenhas has seen patients for Myeloproliferative Disorders, Thrombocytosis and Bone Marrow Biopsy, and more. You can see other conditions treated by Dr. Mascarenhas on their profile. Please call the provider’s office to confirm all visit reasons.

    13 patients have reviewed Dr. Mascarenhas. The overall rating for this provider is 5.0. You can read verified reviews and ratings and leave your own review based on your experience with Dr. Mascarenhas.

    Whether a person prefers to schedule an appointment online or over the phone with Dr. Mascarenhas, there are benefits to both methods. A person calling to schedule an with Dr. Mascarenhas appointment can ask questions about the practice, provider availability, conditions treated, procedures performed, and if their insurance carrier is accepted. While online scheduling is quicker, easier, allows one to view a wide range of appointment times, and may provide the ability to sync with a personal calendar.

    Search

    Primary Care
    Close Icon

    In the event of a medical emergency, dial 911 or visit your closest emergency room immediately.