Ambulatory Surgery Center

 Ambulatory Surgery Center


9850 Key West Avenue
2nd Floor
Rockville, Maryland 20850
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Hours: 7 a.m. – 5:30 p.m.
Phone: 301-765-5400
Fax: 301-765-5490
Practice Manager: Rose Cloughly-Plessinger | Medical Director: Marjorie Brennan, MD

Welcome to the Children’s National Health System Montgomery County Ambulatory Surgery Center, a state-of-the-art surgical facility specifically for children. Our center was designed with families in mind, providing a comfortable and welcoming environment for you and your child.

We offer a wide range of outpatient specialty surgical services for children in our two operating rooms, staffed by our nationally-recognized pediatric surgeons. We guarantee a board-certified pediatric anesthesiologist 24/7.  

Children’s National Health System has been named to the prestigious Honor Roll of the U.S. News & World Report 2015-16 Best Children’s Hospitals, ranking among the top 10 pediatric hospitals in the nation. Children’s National also has been designated for a second time as a Magnet® hospital, a designation given to hospitals that demonstrate the highest standards of nursing and patient care delivery. Only seven percent of hospitals across the United States achieve Magnet® status. The Montgomery County Surgery Center brings this excellent care for children close to your family.

Patient Rights

For patients who want to file concerns or grievances, please contact the State of Maryland or the Medicare Ombudsman :

  1. State of Maryland
    Office of Health Care Quality
    55 Wade Avenue BB Building
    Catonsville, MD 21228

  2. Medicare
  3. Medicare Ombudsman


Children's Specialists

Children's Specialists at this Location


George Zalzal

Division Chief, Ear, Nose, and Throat (Otolaryngology)

Richard Bosco

Anesthesiologist | Medical Director for the Center for Surgical Care

Marc DiFazio

Neurologist | Medical Director, Montgomery County Regional Outpatient Center | Medical Director, Ambulatory Neurology

Matthew Oetgen

Division Chief, Orthopaedic Surgery and Sports Medicine
Pestieau S

Sophie Pestieau

Anesthesiologist | Acute Pain Specialist | Associate Chief for Clinical Affairs

Gary Rogers

Division Chief, Plastic and Reconstructive Surgery

Rahul Shah

Vice President & Chief Quality & Safety Officer


  • Access to public transportation
  • Complimentary Coffee
  • Free onsite parking




  • Aetna
  • Amerigroup Maryland
  • Anthem HealthKeepers Plus
  • Beech Street
  • CareFirst Blue Cross Blue Shield
  • Choicecare Humana
  • Cigna Healthcare of the Mid Atlantic
  • Coventry National PPC
  • First Health
  • GMC Healthcare
  • Health Services for Children with Special Needs
  • InforMed
  • INTotal Health
  • Kaiser Permanente
  • Maryland Physicians Care
  • Multiplan Private Healthcare Systems
  • Priority Partners MCO
  • Riverside Health
  • Tricare HealthNet Federal Services
  • Trusted
  • UnitedHealthcare
  • UnitedHealthcare Community Plan of Maryland
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