Marianne Nellis, M.D., M.S.
Pediatric Critical Care Medicine
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Marianne Nellis, M.D., M.S.

Pediatric Critical Care Medicine

Profile Photo of Marianne Nellis, M.D., M.S.
Not Accepting New Patients
Gender: Female
Language: English, Hebrew


Personal Statement

I specialize in the care of the critically ill child. Though it is a difficult time and involves complex care, my goal is to make the experience of a child in our ICU and their family as smooth as possible. This is accomplished through compassionate care and frequent communication. In addition, through my research endeavors, I hope to make the transfusion of blood products to children as safe as possible.

Specialties and Expertise


  • Pediatrics
  • Pediatric Critical Care Medicine


  • Transfusion Medicine
  • Trauma In Pediatric Patient
  • Respiratory Failure, Acute
  • Sepsis
  • Asthma With Severe Asthma Attack
  • Intensive Care After Cardiac Surgery


Dr. Marianne Nellis graduated from Colgate University with a BA in biochemistry in 1999. She received her medical degree from Johns Hopkins School of Medicine in 2003. After completing her residency in pediatrics at NewYork-Presbyterian Hospital/Weill Cornell Medical Center, she served an additional year as chief resident. Dr. Nellis worked abroad in pediatric intensive care units at Soroka University Medical Center (in Beersheva, Israel) and Safra Children’s Hospital at Sheba Medical Center (in Tel Aviv, Israel). She returned to the United States and NewYork-Presbyterian Hospital/Weill Cornell Medical Center to complete her fellowship training in pediatric critical care medicine. 

Dr. Nellis has also completed a Masters in Clinical Investigation. Her research interests involve transfusion medicine.


Honors and Awards

Honors and Awards

  • May 2017. New York Super Doctor - Rising Star
  • June 2012. Department of Pediatrics Fellow Award for Teaching Excellence
  • May 2006. NewYork-Presbyterian/Weill Cornell Medical College Distinguished Housestaff Award
  • May 1999. Phi Beta Kappa


Board Certifications

  • American Board of Pediatrics
  • American Board of Pediatrics (Pediatric Critical Care Medicine)

Clinical and Academic Positions

  • John D. & Lili R. Bussel, M.D. Associate Professor in Pediatric Hematology - Weill Cornell Medical College, Cornell University
  • Associate Attending Pediatrician - NewYork-Presbyterian Hospital
  • Associate Professor of Pediatrics - Weill Cornell Medical College, Cornell University

Education and Training

  • M.S., Weill Graduate School of Medical Sciences of Cornell University, 2014
  • M.D., The Johns Hopkins University School of Medicine, 2003
  • B.S., Colgate University, 1999


Insurance Plans Accepted

The following represents most of the managed care plans accepted by this doctor. If your insurance carrier does not appear here please contact the doctor’s office as they may have individual contracts not included on this site.

* indicates this doctor is no longer accepting new patients with this insurance plan.

  • AETNA - Medicare
  • Aetna - Weill Cornell - POS
  • Aetna-NYP - EPO/POS
  • Affinity Access
  • Affinity Health Plan
  • Amida Care
  • Empire Blue Cross/Blue Shield - EPO
  • Empire Blue Cross/Blue Shield - HMO
  • Empire Blue Cross/Blue Shield - Mediblue (Senior)
  • Empire Blue Cross/Blue Shield - PPO
  • Empire Blue Cross/Blue Shield HealthPlus
  • Empire Blue Cross/Blue Shield HealthPlus - CHP
  • Fidelis Care
  • GHI - CBP
  • Health First
  • Health Insurance Plan of NY (HIP)
  • Health Insurance Plan of NY (HIP) - Medicaid
  • Medicaid
  • Medicare
  • Oxford Health Plans - Freedom
  • Oxford Health Plans - Liberty
  • Oxford Health Plans - Metro/Core/Charter
  • Rockefeller University - Trustmark
  • United Empire
  • United Healthcare
  • United Healthcare - Community Plan
  • United Healthcare Compass
  • WellCare of NY
  • WorldWide Medical

Locations and Appointments

External Relationships

External Relationships

Relationships and collaborations with for-profit and not-for profit organizations are of vital importance to our faculty because these exchanges of scientific information foster innovation. As experts in their fields, WCM physicians and scientists are sought after by many organizations to consult and educate. WCM and its faculty make this information available to the public, thus creating a transparent environment.

Edmond and Lily Safra Children's Hospital