Appointment Center (303) 436-4949

CHS Management Team


Simon Hambidge, MD, PhD

Dr. Hambidge is Chief Ambulatory Officer at Denver Health and Chief Executive Officer of Denver Community Health Services (DCHS). A pediatrician by training, Dr. Hambidge was previously the Director of General Pediatrics for Community Health Services for 8 years. He is a Professor of Pediatrics at the University School of Medicine, and has practiced at Denver Health since 1997.

As DCHS Director, Dr. Hambidge oversees a network of 9 community health centers and 17 school-based clinics, which provide health care to over 150,000 patients, approximately one-fourth of the population of Denver. Denver Health’s patients include over half of the Medicaid patients in the city. 

Dr. Hambidge still provides limited clinical care in the Webb Center for Primary Care’s Kids Care clinic. He has published numerous articles on topics such as vaccine safety and pediatric obesity.

Dr. Hambidge serves on the Board of Directors of the Denver Health Medical Plan, the Colorado Community Health Network, the Community Health Association of Mountain and Plains States, the Northeast Denver Initiative, and Reach Out and Read Colorado.

    Ray Estacio, MD

Ray Estacio, MD is the Ambulatory Care Services Associate Medical Director for Quality and Research whose responsibility is to improve healthcare delivery to Denver Health patients.  Dr. Estacio a general internist and is a primary care physician at the Westside Family Health Center’s Adult Clinic. He graduated from Indiana University School of Medicine and completed General Internal Medicine training at the University of Colorado Health Sciences Center.

Dr. Estacio’s research projects focus on interventions to improve racial/ethnic disparities in diabetes and cardiovascular disease. His research career has included participation in a number of NIH and industry-sponsored prospective randomized clinical trials in diabetes, hypertension and CV disease over the past 15 years. This includes leadership roles in projects examining strategies to improving healthcare delivery which have been funded by NIDDK, NHLBI, AHRQ and American Diabetes Association.  He also serves as Director of Community Health Programs for the Colorado Prevention Center (CPC) for the past three years. The CPC programs focus on promoting cardiovascular health through screening and education. These programs have been implemented in over 25 Colorado counties and are funded by a number of sources including local and national foundations and state and federal grants.


Rachel Everhart, MS, PhD

Rachel directs the clinical and operational data management, analysis and reporting for the Ambulatory Care Services department at Denver Health. Dr. Everhart is involved in program evaluation for various grant-funded programs focused on improving the healthcare access, utilization, and quality of Denver’s medically underserved population. She gained experience working with and advocating for underserved populations through a year of service as an AmeriCorps VISTA. Dr. Everhart earned her PhD in Health Services Research from the University of Colorado at Denver and Health Sciences Center and holds a MS in Clinical Epidemiology and Health Services Research from Wake Forest University. She enjoys sharing the blend of urban and mountain amenities that Denver allows with her husband, two children, and Greater Swiss Mountain dog.


Steve Federico, MD

Dr. Federico is the Director of Outpatient Pediatrics and Director of School and Community Programs at Denver Health. Dr. Federico is an Associate Professor of Pediatrics at the University of Colorado School of Medicine and a practicing pediatrician at the Montbello Family Health Center and several school-based health centers. He received his undergraduate degree from the University of Arizona and his medical degree from the University of Arizona School of Medicine. He completed his Pediatric residency, a certificate in public health and a Primary Care Research Fellowship through the University of Colorado School of Medicine. He is a physician advocacy fellow at the Institute for Medicine as a Profession and served as President for the Colorado Chapter of the American Academy of Pediatrics from 2010-2012. His academic interests include physician advocacy, health disparities, school health and health policy.


Deb Gardner, BSN, MSN

Deb has a BSN, Cum Laude, from the University of Colorado and MSN, Honors, from Regis University. She has worked as nurse for more than 25 years in a variety of staff and leadership roles. Deb came to Denver health in 1999 as staff nurse in the hospital.  Deb is a Board Certified Nurse Executive from American Nurses Credentialing Center.

Rebecca Hanratty, MD    

Rebecca Hanratty, MD

Dr. Hanratty is the Director of General Internal Medicine and is an Associate Professor of Medicine at the University of Colorado School of Medicine. She is a practicing physician at the Eastside Family Health Center. Dr. Hanratty received her undergraduate degree from the University of Notre Dame, her medical degree from the University of Colorado and did her Internal Medicine residency at the University of Colorado Health Sciences Center. Her research interests include health disparities, cardiovascular disease and chronic kidney disease.

Don Kirkpatrick, MD, AGAF

Don Kirkpatrick, MD, AGAF

Dr. Kirkpatrick is the Associate Director of Service for Medical Specialties. A clinical gastroenterologist at Denver Health and Fellow of the American Gastroenterological Association, his administrative duties are focused on improving access to the specialty clinics. He graduated from Washington University School of Medicine, completed internal medicine residency at the University of Arizona, gastroenterology fellowship at the University of Wisconsin, and will finish a masters in healthcare management from Harvard University in 2018. When not involved in medical pursuits, he can be found practicing his violin at home or at the Evergreen Off Leash Dog Park with the family’s two Australian Shepherds.


Lucy Loomis, MD MSPH

Dr. Loomis is the Director of Family Medicine at Community Health Services, where she oversees the operations of five family health centers providing over 90,000 visits a year to patients of all ages, as well as the academic practice of family physicians in at Denver Health. She practices full scope family medicine, including maternity care, seeing patients at Lowry and La Casa Family Health Centers. 

Dr. Loomis is the founding Director of the Denver Health track of the University of Colorado Family Medicine residency, which has successfully placed graduates in community health centers and other underserved settings.  She has also been active in organized medicine, including board membership on the Denver and Colorado Medical societies. She was president of the Denver Medical Society from 2011-12. Dr. Loomis received a B.S. in Biology from Yale University, her medical degree from Case Western Reserve University, residency in Family Medicine at the University of Connecticut and a master’s in public health from the University of Colorado, Denver.  She is board certified in Family Medicine and General Preventive medicine, and is an associate Professor of Family Medicine and Preventive Medicine.  Her research interests include practice improvement, cancer screening, women’s health, and residency training in the health center environment.

Kathryn Witzeman, MD, FACOG

Kathryn Witzeman, MD, FACOG

Dr. Witzeman is the Associate Director of Women’s Health for Ambulatory Care Services. She is an Associate Professor in the Department of Obstetrics and Gynecology at the University Of Colorado School of Medicine. Dr. Witzeman has a strong interest in women’s preventative health. In 2008, Dr. Witzeman founded the Women's Integrated Pelvic Health Program at Denver Health Medical Center and has overseen its growth and development as its Director since inception. She is a Fellow of the American College of Obstetrics and Gynecology and her clinical and research interests include vulvovaginal disorders, pelvic pain, menstrual disorders, menopausal problems, biomedical ethics as it applies to the field of OBGYN and medical education. Dr. Witzeman joined the Board of Directors of International Pelvic Pain Society in 2014. Dr. Witzeman completed the 2012 APGO Scholars and Leaders program. She completed her medical degree at the University of Cincinnati SOM and her OBGYN residency training at the University of North Carolina, Chapel Hill. In her spare time, she enjoys hiking, cycling, skiing, organic gardening and getting out into the beauty that Colorado offers.