Oanh Nguyen, MD, MAS

Associate 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.
Education
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
Publications
  1. Narayan A, Hong AS, Nguyen OK. Policy in clinical practice: Impact of restoring the 1999 public charge rule on healthcare access for noncitizen immigrants. Journal of hospital medicine 2024. PMID: 38358059


  2. Fraimow-Wong L, Martín M, Thomas L, Giuliano R, Nguyen OK, Knight K, Suen LW. Patient and Staff Perspectives on the Impacts and Challenges of Hospital-Based Harm Reduction. JAMA network open 2024. PMID: 38386317


  3. Westeen EP, Escalona M, Holding M, Beraut E, Fairbairn C, Marimuthu MPA, Nguyen O, Perri R, Fisher RN, Toffelmier E, Shaffer HB, Wang IJ. A genome assembly for the southern Pacific rattlesnake, Crotalus oreganus helleri, in the western rattlesnake species complex. The Journal of heredity 2023. PMID: 37493092


  4. Westeen EP, Escalona M, Beraut E, Marimuthu MPA, Nguyen O, Fisher RN, Toffelmier E, Shaffer HB, Wang IJ. A reference genome assembly for the continentally-distributed ring-necked snake, Diadophis punctatus. The Journal of heredity 2023. PMID: 37688363


  5. Nouri S, Lyles CR, Sherwin EB, Kuznia M, Rubinsky AD, Kemper KE, Nguyen OK, Sarkar U, Schillinger D, Khoong EC. Visit and Between-Visit Interaction Frequency Before and After COVID-19 Telehealth Implementation. JAMA network open 2023. PMID: 37713198


  6. Bishop AP, Westeen EP, Yuan ML, Escalona M, Beraut E, Fairbairn C, Marimuthu MPA, Nguyen O, Chumchim N, Toffelmier E, Fisher RN, Shaffer HB, Wang IJ. Assembly of the largest squamate reference genome to date: the western fence lizard, Sceloporus occidentalis. The Journal of heredity 2023. PMID: 37335574


  7. Haber LA, Nguyen OK, Taub J, Martin M. Policy in clinical practice: Elimination of the buprenorphine "X-waiver". Journal of hospital medicine 2023. PMID: 37545111


  8. Rosenthal MA, Ranji SR, Kanzaria HK, Ortiz GM, Chase J, Chodos AH, Nguyen OK, Rodriguez EG, Makam AN. Characterizing patients hospitalized without an acute care indication: A retrospective cohort study. Journal of hospital medicine 2023. PMID: 36757173


  9. Lyles CR, Nguyen OK, Khoong EC, Aguilera A, Sarkar U. Multilevel Determinants of Digital Health Equity: A Literature Synthesis to Advance the Field. Annual review of public health 2022. PMID: 36525960


  10. Martin M, Clement J, Defries T, Makam AN, Nguyen OK. Prevalence and Characteristics of Hospitalizations with Unhealthy Alcohol Use in a Safety-Net Hospital from 2016 to 2018. "It's not the doctor - it's me." How self-blame obscures language and other structural barriers to diabetes care mong low-income Latinos with limited English Proficiency. 2022. PMID: 35060005


  11. Bepo L, Makam AN, Nguyen OK. Sodium-Glucose Cotransporter-2 Inhibitors Versus Glucagon-like Peptide-1 Receptor Agonists and the Risk for Cardiovascular Outcomes in Routine Care Patients With Diabetes Across Categories of Cardiovascular Disease. "It's not the doctor - it's me." How self-blame obscures language and other structural barriers to diabetes care mong low-income Latinos with limited English Proficiency. 2022. PMID: 35038403


  12. 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. "It's not the doctor - it's me." How self-blame obscures language and other structural barriers to diabetes care mong low-income Latinos with limited English Proficiency. 2021. PMID: 34865525


  13. 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. Journal of general internal medicine 2021. PMID: 34518978


  14. Wray CM, Tang J, Shah S, Nguyen OK, Keyhani S. Sociodemographics, Social Vulnerabilities, and Health Factors Associated with Telemedicine Unreadiness Among US Adults. Journal of general internal medicine 2021. PMID: 34331214


  15. Sekar DR, Siropaides CH, Smith LN, Nguyen OK. Adapting Existing Resources for Serious Illness Communication Skills Training for Internal Medicine Residents. Southern medical journal 2021. PMID: 33942112


  16. 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. Journal of general internal medicine 2021. PMID: 33443694


  17. 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. BMJ open quality 2021. PMID: 33500326


  18. 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. BMC health services research 2020. PMID: 33176767


  19. Saleh SN, Makam AN, Halm EA, Nguyen OK. Can we predict early 7-day readmissions using a standard 30-day hospital readmission risk prediction model? BMC medical informatics and decision making 2020. PMID: 32933505


  20. Makam AN, Nguyen OK, Halm EA. REPLY TO COMMENT ON: THE CLINICAL COURSE AFTER LONG-TERM ACUTE CARE HOSPITAL ADMISSION AMONG OLDER MEDICARE BENEFICIARIES. Journal of the American Geriatrics Society 2020. PMID: 31903543


  21. 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. Journal of the American Geriatrics Society 2019. PMID: 31449686


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


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


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


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


  26. 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. JAMA internal medicine 2019. PMID: 30575859


  27. 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. Journal of the American Geriatrics Society 2018. PMID: 30281783


  28. 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. Journal of the American Geriatrics Society 2018. PMID: 30295927


  29. 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. JAMA internal medicine 2018. PMID: 29868749


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


  31. 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. JAMA internal medicine 2018. PMID: 29404575


  32. 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. Circulation. Cardiovascular quality and outcomes 2018. PMID: 29321135


  33. Nguyen OK, Makam AN. What Are the Opportunity Costs of Self-Financing Medical Education? Volume 92 of Issue 12. Academic medicine : journal of the Association of American Medical Colleges 2017. PMID: 29210740


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


  35. 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. BMJ quality & safety 2017. PMID: 28652259


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


  37. 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. Journal of hospital medicine 2017. PMID: 28411288


  38. Makam AN, Nguyen OK. An Evidence-Based Medicine Approach to Antihyperglycemic Therapy in Diabetes Mellitus to Overcome Overtreatment. Volume 135 of Issue 2. Circulation 2017. PMID: 28069712


  39. 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. Preventing chronic disease 2016. PMID: 27736055


  40. 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. Annals of the American Thoracic Society 2016. PMID: 27299853


  41. 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. Journal of general internal medicine 2016. PMID: 27503438


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


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


  44. 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. Health services research 2016. PMID: 27283354


  45. Nguyen OK, Makam AN, Halm EA. National Use of Safety-Net Clinics for Primary Care among Adults with Non-Medicaid Insurance in the United States. Volume 11 of Issue 3. PloS one 2016. PMID: 27027617


  46. 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. Journal of hospital medicine 2016. PMID: 26929062


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


  48. 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. Annals of gerontology and geriatric research 2015. PMID: 26702452


  49. Mody P, Nguyen OK. Selecting the Optimal Design for Drug Discontinuation Trials in a Setting of Advanced, Life-Limiting Illness. Volume 175 of Issue 10. JAMA internal medicine 2015. PMID: 26436750


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


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


  52. Nguyen OK, Kruger J, Greysen SR, Lyndon A, Goldman LE. Understanding how to improve collaboration between hospitals and primary care in postdischarge care transitions: a qualitative study of primary care leaders' perspectives. Volume 9 of Issue 11. Journal of hospital medicine 2014. PMID: 25211608


  53. 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. Journal of general internal medicine 2014. PMID: 25092009


  54. 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. Journal of hospital medicine 2013. PMID: 24173680


  55. Makam AN, Nguyen OK, Moore B, Ma Y, Amarasingham R. Identifying patients with diabetes and the earliest date of diagnosis in real time: an electronic health record case-finding algorithm. Volume 13. BMC medical informatics and decision making 2013. PMID: 23915139


  56. 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. Annals of internal medicine 2013. PMID: 23460101


  57. 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. Developmental neuroscience 2005. PMID: 15886485


  58. 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. Proceedings of the National Academy of Sciences of the United States of America 1997. PMID: 9405603