Oanh Nguyen, MD, MAS

Assistant Professor

Dr. Nguyen is a physician-health services researcher with expertise in epidemiology and implementation science. Her research portfolio focuses on understanding how social and structural determinants of health affect care delivery and outcomes for people from underserved and historically marginalized communities, and on how to overcome these factors through interventions embedded in healthcare systems and/or health care policy.

As a practicing hospital medicine physician and a safety-net hospitalist researcher, she has studied these issues primarily through the lens of hospitalization and hospital readmissions in safety-net settings. Spending on hospital care accounts for 31% of ~$1.3 trillion of annual U.S. health care spending. Reducing 30-day hospital readmissions is a priority because hospitals are financially penalized and because readmissions are frequent (occurring in 1 of 5 hospitalized patients), costly, and expose patients to increased potential harms of hospitalization including adverse drug events, hospital-acquired disability, and increased mortality. Over the past decade, there has been increasing recognition that frequent readmissions may also be a marker for increased clinical severity and social risk factors in certain populations, particularly those who receive care in safety-net settings. Her work to date has focused on understanding the influence of social determinants of health and social risk factors on readmissions and post-hospital recovery, and on developing potential interventions to address these needs to optimize post-hospital recovery.

Dr. Nguyen holds affiliations in the UCSF Center for Vulnerable Populations, Benioff Homelessness and Housing Initiative, Social Interventions Research and Evaluation Network, Institute for Health Policy Studies, and PRISE Center. Her work is supported by the National Heart, Lung, and Blood Institute, the California Health Care Foundation. She has been recognized locally and nationally for her research, receiving the ZSFG Outstanding Junior Investigator Award in 2019 and the Society of Hospital Medicine Junior Investigator Award in 2019). She currently serves as the UCSF PRISE Center Program Director for Hospital Care, was formerly a deputy editor at the Journal of General Internal Medicine, and currently serves as deputy editor for the Journal of Hospital Medicine. In 2022, she was named a Chan Zuckerberg Biohub Investigator, an independent nonprofit research initiative that empowers scientists to pursue high-risk and innovative scientific research.
BS, - Neuroscience & political science, University of California, Los Angeles
MD, - , University of California, San Diego
MAS, - Clinical Research with Specialization in Implementation Science, University of California, San Francisco
- Internship & Residency in Internal Medicine, University of Texas Southwestern Medical Center; Parkland Health & Hospital System
  1. Sterling MR, Ringel JB, Pinheiro LC, Safford MM, Levitan EB, Phillips E, Brown TM, Nguyen OK, Goyal P. Social Determinants of Health and 30-Day Readmissions Among Adults Hospitalized for Heart Failure in the REGARDS Study. 2021. PMID: 34865525

  2. Suen LW, Makam AN, Snyder HR, Repplinger D, Kushel MB, Martin M, Nguyen OK. National Prevalence of Alcohol and Other Substance Use Disorders Among Emergency Department Visits and Hospitalizations: NHAMCS 2014-2018. 2021. PMID: 34518978

  3. Nguyen OK, Washington C, Clark CR, Miller ME, Patel VA, Halm EA, Makam AN. Man vs. Machine: Comparing Physician vs. Electronic Health Record-Based Model Predictions for 30-Day Hospital Readmissions. 2021. PMID: 33443694

  4. Martin M, Snyder HR, Coffa D, Steiger S, Clement JP, Ranji SR, Azari S, Nguyen OK, Lum PJ. Time to ACT: launching an Addiction Care Team (ACT) in an urban safety-net health system. 2021. PMID: 33500326

  5. Makam AN, Nguyen OK, Miller ME, Shah SJ, Kapinos KA, Halm EA. Comparative effectiveness of long-term acute care hospital versus skilled nursing facility transfer. 2020. PMID: 33176767

  6. Makam AN, Tran T, Miller ME, Xuan L, Nguyen OK, Halm EA. The Clinical Course after Long-Term Acute Care Hospital Admission among Older Medicare Beneficiaries. 2019. PMID: 31449686

  7. Schumacher RC, Nguyen OK, Makam AN. Evidence-Based Medicine and the American Thoracic Society Guidelines-Reply. 2019. PMID: 31260021

  8. Keshvani N, Berger K, Gupta A, DePaola S, Nguyen OK, Makam AN. Improving Respiratory Rate Accuracy in the Hospital: A Quality Improvement Initiative. 2019. PMID: 31251168

  9. DeWaters AL, Loria H, Mayo H, Chisty A, Nguyen OK. The Impact of Block Ambulatory Scheduling on Internal Medicine Residencies: a Systematic Review. 2019. PMID: 30993618

  10. Schumacher RC, Nguyen OK, Desphande K, Makam AN. Evidence-Based Medicine and the American Thoracic Society Clinical Practice Guidelines. 2019. PMID: 30776054

  11. Nguyen OK, Vazquez MA, Charles L, Berger JR, Quiñones H, Fuquay R, Sanders JM, Kapinos KA, Halm EA, Makam AN. Association of Scheduled vs Emergency-Only Dialysis With Health Outcomes and Costs in Undocumented Immigrants With End-stage Renal Disease. Volume 179 of Issue 2. 2019. PMID: 30575859

  12. Makam AN, Nguyen OK, Kirby B, Miller ME, Xuan L, Halm EA. Effect of Site-Neutral Payment Policy on Long-Term Acute Care Hospital Use. Volume 66 of Issue 11. 2018. PMID: 30281783

  13. Makam AN, Nguyen OK, Xuan L, Miller ME, Halm EA. Long-Term Acute Care Hospital Use of Non-Mechanically Ventilated Hospitalized Older Adults. Volume 66 of Issue 11. 2018. PMID: 30295927

  14. Makam AN, Nguyen OK, Halm EA. Shortcomings of Research Regarding Long-term Acute Care Hospitals and Skilled Nursing Facilities-Reply. Volume 178 of Issue 6. 2018. PMID: 29868749

  15. Nguyen OK, Higashi RT, Makam AN, Mijares JC, Lee SC. The Influence of Financial Strain on Health Decision-Making. Volume 33 of Issue 4. 2018. PMID: 29340939

  16. Makam AN, Nguyen OK, Xuan L, Miller ME, Goodwin JS, Halm EA. Factors Associated With Variation in Long-term Acute Care Hospital vs Skilled Nursing Facility Use Among Hospitalized Older Adults. Volume 178 of Issue 3. 2018. PMID: 29404575

  17. Smith LN, Makam AN, Darden D, Mayo H, Das SR, Halm EA, Nguyen OK. Acute Myocardial Infarction Readmission Risk Prediction Models: A Systematic Review of Model Performance. Volume 11 of Issue 1. 2018. PMID: 29321135

  18. Nguyen OK, Makam AN. What Are the Opportunity Costs of Self-Financing Medical Education? Volume 92 of Issue 12. 2017. PMID: 29210740

  19. Keshvani N, Berger K, Nguyen OK, Makam AN. Roadmap for improving the accuracy of respiratory rate measurements. Volume 27 of Issue 8. 2017. PMID: 29122976

  20. Badawy J, Nguyen OK, Clark C, Halm EA, Makam AN. Is everyone really breathing 20 times a minute? Assessing epidemiology and variation in recorded respiratory rate in hospitalised adults. Volume 26 of Issue 10. 2017. PMID: 28652259

  21. Makam AN, Nguyen OK, Clark C, Halm EA. Incidence, Predictors, and Outcomes of Hospital-Acquired Anemia. Volume 12 of Issue 5. 2017. PMID: 28459899

  22. Makam AN, Nguyen OK, Clark C, Zhang S, Xie B, Weinreich M, Mortensen EM, Halm EA. Predicting 30-Day Pneumonia Readmissions Using Electronic Health Record Data. Volume 12 of Issue 4. 2017. PMID: 28411288

  23. Pruitt SL, Leonard T, Xuan L, Amory R, Higashi RT, Nguyen OK, Pezzia C, Swales S. Who Is Food Insecure? Implications for Targeted Recruitment and Outreach, National Health and Nutrition Examination Survey, 2005-2010. Volume 13. 2016. PMID: 27736055

  24. Weinreich M, Nguyen OK, Wang D, Mayo H, Mortensen EM, Halm EA, Makam AN. Predicting the Risk of Readmission in Pneumonia. A Systematic Review of Model Performance. Volume 13 of Issue 9. 2016. PMID: 27299853

  25. Nguyen OK, Makam AN, Clark C, Zhang S, Xie B, Velasco F, Amarasingham R, Halm EA. Vital Signs Are Still Vital: Instability on Discharge and the Risk of Post-Discharge Adverse Outcomes. Volume 32 of Issue 1. 2016. PMID: 27503438

  26. Nguyen OK, Halm EA, Makam AN. Further Limitations of the HOSPITAL Score in US Hospitals. Volume 176 of Issue 8. 2016. PMID: 27479675

  27. Makam AN, Nguyen OK. Clinical Criteria to Identify Patients With Sepsis. Volume 316 of Issue 4. 2016. PMID: 27458952

  28. Fontil V, Bibbins-Domingo K, Nguyen OK, Guzman D, Goldman LE. Management of Hypertension in Primary Care Safety-Net Clinics in the United States: A Comparison of Community Health Centers and Private Physicians' Offices. Volume 52 of Issue 2. 2016. PMID: 27283354

  29. Nguyen OK, Makam AN, Clark C, Zhang S, Xie B, Velasco F, Amarasingham R, Halm EA. Predicting all-cause readmissions using electronic health record data from the entire hospitalization: Model development and comparison. Volume 11 of Issue 7. 2016. PMID: 26929062

  30. Nguyen OK, Halm EA, Makam AN. Relationship between hospital financial performance and publicly reported outcomes. Volume 11 of Issue 7. 2016. PMID: 26929094

  31. Makam AN, Nguyen OK, Zhou J, Ottenbacher KJ, Halm EA. Trends in Long-Term Acute Care Hospital Use in Texas from 2002-2011. Volume 2 of Issue 3. 2015. PMID: 26702452

  32. Makam AN, Nguyen OK, Auerbach AD. Diagnostic accuracy and effectiveness of automated electronic sepsis alert systems: A systematic review. Volume 10 of Issue 6. 2015. PMID: 25758641

  33. Makam AN, Nguyen OK. Use of cardiac biomarker testing in the emergency department. Volume 175 of Issue 1. 2015. PMID: 25401720

  34. Nguyen OK, Chan CV, Makam A, Stieglitz H, Amarasingham R. Envisioning a social-health information exchange as a platform to support a patient-centered medical neighborhood: a feasibility study. Volume 30 of Issue 1. 2014. PMID: 25092009

  35. Nguyen OK, Tang N, Hillman JM, Gonzales R. What's cost got to do with it? Association between hospital costs and frequency of admissions among "high users" of hospital care. Volume 8 of Issue 12. 2013. PMID: 24173680

  36. Rennke S, Nguyen OK, Shoeb MH, Magan Y, Wachter RM, Ranji SR. Hospital-initiated transitional care interventions as a patient safety strategy: a systematic review. 2013. PMID: 23460101

  37. Cepeda C, André VM, Flores-Hernández J, Nguyen OK, Wu N, Klapstein GJ, Nguyen S, Koh S, Vinters HV, Levine MS, Mathern GW. Pediatric cortical dysplasia: correlations between neuroimaging, electrophysiology and location of cytomegalic neurons and balloon cells and glutamate/GABA synaptic circuits. 2005. PMID: 15886485

  38. Scott MR, Safar J, Telling G, Nguyen O, Groth D, Torchia M, Koehler R, Tremblay P, Walther D, Cohen FE, DeArmond SJ, Prusiner SB. Identification of a prion protein epitope modulating transmission of bovine spongiform encephalopathy prions to transgenic mice. Volume 94 of Issue 26. 1997. PMID: 9405603