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Ron E. Kastner, MD

Ron E. Kastner, MD

Optum Provider

Specialty

Internal Medicine

Languages

English

Seeing patients at

Monday 8:00 AM - 7:30 PM
Tuesday 8:00 AM - 7:30 PM
Wednesday 8:00 AM - 7:30 PM
Thursday 8:00 AM - 7:30 PM
Friday 8:00 AM - 5:00 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

67 reviews

    • Reviewed on May 29, 2026
    • Verified Review

    Dr kastner has been my primary for over 20 years I think and will be for next 20 He’s the best

    • Reviewed on May 22, 2026
    • Verified Review

    My doctor for 20 years. Never had an issue w dr k

    • Reviewed on May 15, 2026
    • Verified Review

    Dr. Kastner has been my primary care physician for over 30 years. He listens to any concerns and provides well-informed recommendations for my continued healthcare. He is always attentive and thoughtful in my treatment and therefore is a trusted advocate for my continued well-being.

    • Reviewed on May 9, 2026
    • Verified Review

    Very clear and listened

    • Reviewed on May 3, 2026
    • Verified Review

    Dr Kastner is fantastic. Very informative and caring

    • Reviewed on May 2, 2026
    • Verified Review

    Dr. Kastner is very knowledgeable, thorough and takes the time to address all of of the relevant issues.

    • Reviewed on Apr 29, 2026
    • Verified Review

    A caring thorough doctot

    • Reviewed on Apr 28, 2026
    • Verified Review

    Because he knows what he’s doing

    • Reviewed on Apr 28, 2026
    • Verified Review

    Very likely. He is a wonderful physician who I trust

    • Reviewed on Apr 27, 2026
    • Verified Review

    First time visit. Very happy with Dr Kastner!

    • Reviewed on Apr 16, 2026
    • Verified Review

    Great Dr.

    • Reviewed on 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 .

    • Reviewed on 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.

    • Reviewed on Apr 8, 2026
    • Verified Review

    He is a smart excellent doctor

    • Reviewed on 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.

    • Reviewed on 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

    • Reviewed on Apr 4, 2026
    • Verified Review

    Great doctor knows his stuff

    • Reviewed on Apr 1, 2026
    • Verified Review

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

    • Reviewed on Mar 21, 2026
    • Verified Review

    He is a great Dr whom I trust completely

    • Reviewed on Mar 18, 2026
    • Verified Review

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

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