About Us

At Westchester Health, we genuinely care about our patients as well as care for them.

Patient-Centered Care.

Here at Westchester Health, we’re committed to delivering the highest level of compassionate, highly personalized medical care, centered around you and your family. With a team of over 100 physicians, nurse practitioners and physician assistants, every one of our offices is dedicated to delivering the expert, patient-centered care you need and expect.

ncqa_recognized-practice_logoNationally recognized by the NCQA Patient-Centered Medical Home, we have achieved the highest accreditation possible for demonstrating better patient experience, better health and lower per capita cost. As a Patient-Centered Medical Home (PCMH), your treatment is coordinated through your primary care physician to ensure you receive the very best care in a manner you can understand.

Whether you are sick, injured, receiving treatment or are here for a preventative well-visit, when you walk through our doors, you’ll receive the personal attention of our staff as well as the most technologically advanced, state-of-the-art care. In addition, you and your family members will be brought into the decision-making process so that you have a voice regarding your healthcare.

Westchester Health—Northwell Health Integration

In March 2017, Westchester Health joined Northwell Health and its 2,700-member physician organization, Northwell Health Physician Partners. This important partnership connects us to Northwell Health’s extraordinary resources, enabling us to greatly expand our services to bring you and your family the best possible care in the region. Now, you have access to the very best specialists, leading experts and innovative care solutions in our area.

Our relationship with Northwell Health also links us to an outstanding network of highly specialized services that includes over 23 hospitals, the Zucker School of Medicine at Hofstra/Northwell, The Feinstein Institute for Medical Research, the highest quality rehabilitation and skilled nursing facilities, an exceptional home care network, a hospice network and numerous progressive care centers.

As New York State’s largest healthcare provider, Northwell Health spans the entire region, bringing its expertise close to where you live and work. With over 550 outpatient facilities, 40 Westchester Health offices throughout Westchester County and in Fairfield County, and two hospitals in Westchester—Northern Westchester Hospital and Phelps Hospital—we are ready to provide outstanding care whenever, wherever you need us.

In addition, our Westchester Health network now includes specialists in Bariatric Surgery, Breast Surgery, Endocrine Surgery, Hematology/Oncology, Nephrology, Neurology, Oncology Surgery, Orthopedics and Orthopedic Surgery, Pain Management, Pediatric Gastroenterology, Pediatric Rheumatology, Thoracic Surgery and Vascular Surgery.

Building Caring Partnerships

At Westchester Health, it’s not just about medicine—it’s about building relationships.

We firmly believe that the strength of the physician-patient relationship is essential to your health and well-being. Each of our physicians and providers takes the time to listen to your concerns, evaluate your condition, collaborate with you on the best course of action and answer your questions. Each time you leave our office, our goal is for you to know that you have received exceptional medical care delivered with the personalized care you deserve.


Peter Mercurio, MD, FACC

President, CEO, Westchester Health

Since its inception in July 2007, Peter Mercurio, MD, FACC has been the President and CEO of Westchester Health, evolving the group from its 30+ founding members to over 90 healthcare providers in more than 40 locations throughout Westchester and Fairfield counties. In March 2017, Westchester Health joined Northwell Health and became part of Northwell Health Physician Partners. Throughout this transition, Dr. Mercurio has continued Westchester Health’s mission of affordable, patient-centered care, providing the standards for quality care in the Westchester, NY and Fairfield, CT regions. Dr. Mercurio completed his Residency and Chief Residency training at the NYU School of Medicine, as well as a subspecialty program in Cardiology at NYU Bellevue, achieving top fellowship status. He has also received subspecialty training in Nuclear Cardiology. Having practiced medicine in the community for more than 30 years, Dr. Mercurio was a founding member of Westchester Health Associates. He has served on the Board of Trustees at Northern Westchester Hospital and has been a past President of the Medical Staff and Chair of the Medical Board. He has had appointments to Northern Westchester Hospital, NYU and the Westchester County Medical Center, and is currently Assistant Professor of Cardiology at the Northwell Zucker School of Medicine. As an administrator, Dr. Mercurio plays a key role in directing Westchester Health as it provides the primary care footprint for Northwell Health to grow in this region. He continues to serve as President and Board Chair of Westchester Health and is a Regional Director for Strategic Growth for the Northwell Health System. Dr. Mercurio’s leadership ensures that the mission, vision and values of Westchester Health align closely with the Northwell System, allowing the integrated, multi-specialty group to give its patients the best possible care.

Nancy R. Beran, MD MHCDS CPE

CMO, Westchester Health

Nancy R. Beran, MD MHCDS CPE is a founding member and Chief Medical Officer of Westchester Health. In this role, Dr. Beran has been integral to the strategic recruitment and integration of new physicians and to the clinical growth of Westchester Health practices in Westchester, NY and Stamford, CT. Leading the transformation of Westchester Health’s practice over the past 10 years, Dr. Beran consistently focuses on patient-centered, value-based care. She has overseen the implementation of NCQA Patient Centered Medical Home certification in all Westchester Health primary care sites, and has worked as an innovative regional leader on Medicare’s Comprehensive Primary Care Initiative. Having designed numerous quality and population health-based programs at Westchester Health, Dr. Beran now oversees Westchester Health’s population health strategy and participation in the Northwell Medicare Shared Savings Program. Currently, she serves as the Director and Chief of Quality in Westchester and Fairfield counties for Northwell Health Physician Partners. Dr. Beran is a practicing Internist with over 20 years’ experience whose primary focus is Women’s Health. She performed her undergraduate work at Washington University in St. Louis, graduating Phi Beta Kappa, attended medical school at the Sidney Kimmel Medical College (formerly Jefferson Medical College), and performed her residency at the prestigious University of Texas Southwestern Internal Medicine program. In addition, she recently completed her Masters of Healthcare Delivery Science at Dartmouth College. For the past five years, Dr. Beran has been recognized as a Top Doctor in Westchester County, Exceptional Woman in Medicine 2017, and practitioner of an outstanding clinical practice with the Comprehensive Primary Care Initiative. Above all, her fundamental commitment is to her patients and to improving healthcare for all.

Teresa A. Whitney, MHA, CMPE

Vice President, COO Westchester Health

Teresa Whitney joined Westchester Health Associates in 2009 as its Chief Operating Officer. Responsible for all operational aspects of Westchester Health, Ms. Whitney has built the infrastructure needed to support the group as it grew from 30 original members to over 90 providers in 37 sites. With over 25 years in healthcare administration, Ms. Whitney has extensive experience in strategy, business and clinical operations, finance, and human resources. She particularly enjoys mentoring managers and directors while helping them succeed in the field of medical practice management. Ms. Whitney holds a Bachelors’ degree in Management from Granite State College and a Master of Healthcare Administration from Ohio University. She served on the Board of Directors of the Connecticut Medical Group Management Association for 9 years and served as President in 2016. Ms. Whitney is a board certified medical practice executive through the American College of Medical Practice Executives.

Thank you for allowing us to provide your care

At Westchester Health, we are committed to doing everything we can to deliver the best possible medical care, and we look forward to seeing you and your family soon.