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Practice Locations

Children's Hospital Colorado South Campus
Highlands Ranch
1811 Plaza Drive Highlands Ranch, CO 80129


Marion Sills, MD

Pediatric Emergency Medicine

Board Certified


Practice Locations

Children's Hospital Colorado Anschutz Medical Campus
13123 East 16th Ave Aurora, CO 80045


Children's Hospital Colorado South Campus
Highlands Ranch
1811 Plaza Drive Highlands Ranch, CO 80129


Provider Expertise

Clinical Interest for Patients

I provide clinical care for the most acutely ill and needy children in the seven-state area served by Children's Hospital Colorado.

Care Philosophy

I never forget what a privilege it is to be entrusted with sharing healthcare decisions with families. The sense of privilege helps me maintain my humility, the idea of sharing reminds me to keep families engaged in their child’s care, and the role I plan in being entrusted with these decisions reminds me of the discipline required of clinicians to keep up with best practice so as to best honor this privilege.


  • Pediatrics
  • Pediatric Emergency Medicine ( 1999 )

Conditions & Treatments

  • Emergency Care

Interests & Activities

Personal Interests

In my spare time, I enjoy endurance training in the great Colorado sunshine, reading, and spending time with my family.

Education & Training

Medical Schools

MD, Johns Hopkins University School of Medicine (1993)

Undergraduate Schools

AB, Harvard University (MA) (1987)

Graduate Schools

MPH, George Washington University,The (1999)


Johns Hopkins University Program (1994)

Residency Program

Johns Hopkins University Program (1996)


Children's National Medical Center/George Washington University Program (1999)

Professional Memberships

Academy Health, Member

AHRQ's EHC Stakeholder Group, Member

American Academy of Pediatrics (AAP), Fellow

American Public Health Association, Member

Research & Grants


Emergency Department Overcrowding and Quality of Acute Asthma Care and Acute Long Bone Fracture Care for Children (2007)

Emergency Department Overcrowding and Quality of Acute Asthma Care for Children (2007)

The Association between Emergency Department Resources and Pediatric Asthma-Related Quality Indicators (2007)

Pediatric Emergency Department Overcrowding and Quality of Care for Acute Asthma and Acute Long-bone Fractures (2008)

Physician Disaster Preparedness Initiative Evaluation (2009)

Scalable Architecture for Federated Therapeutic Inquiries Network (SAFTINet) (2010)

information for referring providers

Referral Contact Phone

(720) 777-6888

Clinical Interests for Referring Providers

My clinical specialty is Pediatric Emergency Medicine. I am engaged in improving care for our sickest children through my leadership of the hospital's Scientific Advisory Council, through my involvement in quality improvement projects, through my research on improving the quality of care for acute conditions (asthma exacerbations and dehydration), as well as through my role in digital (website, social media) healthcare communications aimed at patients, providers, and policy-makers.

Research Interest for Referring Providers

My research focuses on the system-level, individual care provider-level, and patient-level factors associated with healthcare utilization patterns and with the quality of disease management/control in the emergency department and in primary care settings.