Matthew Niedzwiecki, PhD

Assistant Professor, Department of Emergency Medicine and Philip R. Lee Institute for Health Policy Studies
Zuckerberg San Francisco General Hospital

UCSF School of Medicine
Department of Emergency Medicine Box 1377
1001 Potrero Avenue, Suite 6A
San Francisco, CA 94110

 Brandeis University
MA: University of California, San Diego
Ph.D.: University of California, San Diego

Research and Academic Interests: 
Dr. Niedzwiecki’s research has looked at the extent to which Medicare patients sort themselves across care sites – emergency department vs. primary care clinic – finding that patients who are more seriously ill in ways that are not observed in administrative data tend to select more often into the emergency department. He has also written economics papers on how the Massachusetts health insurance expansion in 2006 affected demand for the ED and other acute hospital care among the newly insured, how traditional valuation of health insurance for low-income populations may be biased downward because it fails to incorporate a barrier to care for the uninsured created by limited access to credit, and also how the current Medicaid expansion has positive spillover effects onto private health insurance exchange risk pools that lowers deductibles in those markets. In ongoing work, Dr. Niedzwiecki is working on the evaluation of a randomized trial that provides permanent supportive housing to a population of homeless patients who are “high utilizers” of medical care and other county services, as well as a variety of other projects related to emergency department care. 


Avoidable emergency department visits: a starting point.

International journal for quality in health care : journal of the International Society for Quality in Health Care

Hsia RY, Niedzwiecki M

Persistent Frequent Emergency Department Use: Core Group Exhibits Extreme Levels Of Use For More Than A Decade.

Health affairs (Project Hope)

Kanzaria HK, Niedzwiecki MJ, Montoy JC, Raven MC, Hsia RY

Urgent Care Needs Among Nonurgent Visits to the Emergency Department.

JAMA internal medicine

Hsia RY, Friedman AB, Niedzwiecki M

Short-term Outcomes for Medicare Beneficiaries After Low-acuity Visits to Emergency Departments and Clinics.

Medical care

Niedzwiecki M, Baicker K, Wilson M, Cutler DM, Obermeyer Z