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Ron E. Kastner, MD

Ron E. Kastner, MD

Optum Provider

Specialty

Internal Medicine

Languages

English

Seeing patients at

Monday 9:00 AM - 5:00 PM
Tuesday 9:00 AM - 5:00 PM
Wednesday 9:00 AM - 5:00 PM
Thursday 9:00 AM - 5:00 PM
Friday 9:00 AM - 4:30 PM
Saturday Closed
Sunday Closed
Hours may vary, please contact to schedule and confirm appointment availability.

Patient Reviews

Patient review summary

Learn about our survey

5

4

3

2

1

5.0

69 reviews

  • Apr 29, 2026
    Verified Review

    A caring thorough doctot

  • Apr 28, 2026
    Verified Review

    Because he knows what he’s doing

  • Apr 28, 2026
    Verified Review

    Very likely. He is a wonderful physician who I trust

  • Apr 27, 2026
    Verified Review

    First time visit. Very happy with Dr Kastner!

  • Apr 16, 2026
    Verified Review

    Great Dr.

  • Apr 10, 2026
    Verified Review

    Dr Kastner is very thorough and very caring. He answers every question you have and makes good re omendstions . He addresses every concern with ease and expertise .

  • Apr 8, 2026
    Verified Review

    Dr. Kastner is very efficient and explains things well. He genuinely cares about his patients from my experience. I couldn't ask for more.

  • Apr 8, 2026
    Verified Review

    He is a smart excellent doctor

  • Apr 6, 2026
    Verified Review

    Dr Kastner has always been responsive to my needs. I have extreme confidence that he has my well being in mind whenever I am in his presence.

  • Apr 4, 2026
    Verified Review

    Dr. Kastner is a great doctor and has helped me for many years and I am very grateful for his care and kindness

  • Apr 4, 2026
    Verified Review

    Great doctor knows his stuff

  • Apr 1, 2026
    Verified Review

    He was extremely helpful and addressed my problem . He was very knowledgeable and I felt confident in his care.

  • Mar 21, 2026
    Verified Review

    He is a great Dr whom I trust completely

  • Mar 18, 2026
    Verified Review

    Dr. Kastner is a very kind, caring physician. He is very professional and thorough.

  • Mar 13, 2026
    Verified Review

    Makes you feel comfortable at exam. Goes over all test results. Makes recommendations carefully so you can understand

  • Mar 10, 2026
    Verified Review

    He’s the BEST!

  • Mar 5, 2026
    Verified Review

    Great doctor

  • Feb 26, 2026
    Verified Review

    Very caring, thorough, listens, explains

  • Feb 23, 2026
    Verified Review

    Exam not thorough.

  • Jan 24, 2026
    Verified Review

    He is very professional and is concerned about your needs

Page 1 of 4
  • About Ron E. Kastner, MD

    Dr. Ron E. Kastner is a board certified internist. He completed medical school at New York University and residency at Mount Sinai Hospital.

    Philosophy of care

    Dr. Kastner provides comprehensive primary care with a focus on continuity and prevention.

    Gender

    Male

    Board certifications

    American Board of Internal Medicine

    Licenses

    NY, 198283

    Employed or contracted

    Employed

    Network Name

    ProHealth

    NPI

    1134200058

  • Insurance Accepted

    This list is for informational purposes only and may not reflect the most current plans accepted by the provider. Optum accepts most major health insurance plans. Please contact your insurance company to confirm your coverage, eligibility, and the provider's participation in your plan.

    • 1199
    • Aetna
    • Affinity
    • Anthem BCBS
    • CHN
    • Centivo
    • Cigna
    • Coventry
    • EmblemHealth
    • First Health
    • Humana
    • MagnaCare
    • Medicaid
    • Medicare
    • MultiPlan
    • NYSHIP
    • Northwell Direct
    • Oscar
    • Oxford
    • TRICARE
    • UHC
    • UMR
  • Medical School

    • New York University School Of Medicine

    Residency

    • Mount Sinai Medical Center