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Dr. Kahn is a practicing general internist and health services researcher. She is a Professor of Medicine at the David Geffen School of Medicine within the Division of General Internal Medicine and Health Services Research.

Dr. Kahn's research focus on the quality of care measurement methods and policy evaluation allowed her to lead some of the nation's major national and local evaluations of the impact of health policy on clinical care and outcomes. She began her career working on the measurement of appropriateness, which led to several high impact manuscripts. She led the work studying the appropriateness of gastrointestinal procedures, which involved developing methods for assessing reasons for a procedure in the inpatient and ambulatory settings. She was one of the first health services researchers to write about comorbidity and complexity of patient's conditions as an important consideration when studying appropriateness and quality of care.
She led the national evaluation of the effect of the DRG-based Prospective Payment System on Quality of Care. This work was recognized nationally and internationally as foundational in the quality of care measurement. It was published in 1990 in an entire issue of JAMA dedicated to the work of the team she led. That work related to six inpatient clinical conditions and required the development of new methods for abstracting clinically detailed data from the medical record, and for linking hospitalized patients with post-discharge follow-up. Her team was the first to report (in 1990) the high rates of hospital readmission within 30 days of discharge. It was also the first to report instability at discharge (using measures she developed) related to the new prospective payment system, and a significant increase in death rates associated with that instability. Dr. Kahn conducted some work comparing quality in Canada and the United States.
Dr. Kahn expanded her work to study quality in obstetrics, rheumatoid arthritis, sepsis, colorectal cancer screening, chronic diseases in the ambulatory setting, and cancer in population-based cohorts. She sought to understand how, if at all, quality of care measures would need to be different across clinical conditions. She was a Principal Investigator for the National Initiative of Cancer Care Quality (NICCQ), an ASCO-funded study that included the development of quality measures related to diagnosis, treatment, management of treatment adverse effects, and post-treatment monitoring. The study showed most patients with breast or colorectal cancer in five U.S. metropolitan regions studied, received recommended care based on expert-established quality-of-care measures. However, opportunities for improvement in clinical care were also documented and disseminated, as a means to motivate such improvements. This work was also important in identifying challenges for a national monitoring system for cancer patients.
In a follow-up to this work, Dr. Kahn was a Principal Investigator for the NCI-funded Cancer Care Outcomes Research and Surveillance (CanCORS) project, leading the work in Los Angeles County, the most populous of CanCORs sites. With this work, Dr. Kahn collaborated with colleagues across the nation and mentored many junior researchers. Her prior experience leading large studies and studying quality across multiple clinical conditions, allowed her to have substantial inputs into the methods used for CanCORS.
During the last ten years, Dr. Kahn has led several of the nation's important health policy evaluations. One example is her leadership of the Evaluation of the CMS Federally Qualified Health Center Demonstration that studied primary care transformation to patient-centered medical homes. She was a senior author on this paper published in NEJM.
Dr. Kahn has received national recognition for her work demonstrating that better inpatient quality of care is associated with better patient outcomes (1990), and for her work demonstrating that better ambulatory care is associated with better health-related quality of life (2007). She received the Damon Runyon Mentorship Award for Study of Quality of Care in 2000, which was the first such award granted for health services research/ health policy by the Damon Runyon Foundation. In 2014, she was invited by the Department of Defense, along with a small, select group of national quality of care leaders to assess DOD's review of the quality of the nation's Military Health System. From 2014-2017, she was recognized with a three-year term as Distinguished Chair in Health Care Delivery Measurement and Evaluation, while continuing her ongoing work at UCLA.
She has published more than 200 peer-reviewed original research papers, including 80 original papers since 2010. These have appeared, often with her as first or senior author, in high-impact journals, including New England Journal of Medicine, JAMA, Journal of Clinical Oncology, JAMA Internal Medicine, Journal of National Cancer Institute, Milbank Quarterly, and Health Affairs. The breadth of clinical journals in which her publications appear, speaks highly of the impact of her work across clinical and policy disciplines. Her array of co-authors also speaks to her extensive mentorship across the years.
Dr. Kahn has been very successful in garnering funds for research and policy evaluations including funding from NIH, Center for Medicare and Medicaid Services, Agency for Healthcare Policy and Research, and from state and local Health Departments. She presents her work at national and local meetings, serves on the Editorial Board for the Journal of General Internal Medicine, and reviews for multiple journals.