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Memorial Day Hours & Measles Important Information

Monday, May 27th – Memorial Day Holiday Hours:

The following offices will be open on Memorial Day. All other CareMount offices will be closed in observance of the holiday.

Urgent Care Hours:

  • Mount Kisco: 8am – 8pm
  • Yorktown Veterans Road: 8am – 5pm
  • Thornwood: 8am – 5pm
  • Carmel: 8am- 5pm
  • Fishkill Westage: 8am-5pm
  • Poughkeepsie Columbia: 9am-7pm
  • Rhinebeck: 8am-5pm
  • Kingston: CLOSED

Other Office Hours:

  • Mount Kisco Internal Medicine: Please visit Mount Kisco Urgent Care
  • Mount Kisco Pediatrics: 9am- 1pm
  • Briarcliff Pediatrics: 9am-1pm
  • Kingston Pediatrics: CLOSED


Measles is here! Learn more about the Measles threat and prevention.

The New York State measles hotline, 1-888-364-4837, is available for community members with any questions regarding the measles or what to do if they are experiencing symptoms.


Leonid Frenkel, DO

Leonid Frenkel, DO

Internal Medicine


Jefferson Valley Campus
3680 Hill Boulevard
Jefferson Valley, NY 10535-1522

Monday - Friday


Undergraduate & Graduate

Bachelor of Arts, Environmental Biology, Colgate University: 2011

Medical Education

New York College of Osteopathic Medicine at NYIT:2015


Internal Medicine Residency, University of Pittsburgh Medical Center: 2018
Chief Resident: 2018

Board Certifications

American Board of Internal Medicine (ABIM): 2018



Hospital Affiliations

New York-Presbyterian Hudson Valley Hospital

Professional Affiliations

American College of Osteopathic Internists

American College of Physicians

American Osteopathic Association


English, Russian