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Rozalina G. Mccoy, MD, MS

Academic Title:

Associate Professor

Primary Appointment:


Secondary Appointment(s):

Epidemiology & Public Health

Administrative Title:

Director, Precision Medicine and Population Health Program for the University of Maryland Institute for Health Computing (UM-IHC)

Additional Title:

Associate Division Chief for Clinical Research, Division of Endocrinology, Diabetes, and Nutrition


Baltimore, MD

Phone (Primary):


Education and Training

2000-2004       B.A., Biochemical Sciences, Harvard University (Summa Cum Laude) with language citation in Modern Hebrew

2004-2009       M.D., Johns Hopkins University School of Medicine

2009-2010       Internship, Mayo Clinic, Rochester, MN

2010-2012       Residency, Internal Medicine, Mayo Clinic, Rochester, MN

2012-2015       Fellowship, Endocrinology, Diabetes, and Metabolism, Mayo Clinic, Rochester, MN

2013-2015       M.S., Mayo Clinic Graduate School of Biomedical Sciences, clinical and translational science


Dr. Rozalina McCoy is an Associate Professor in the Department of Medicine’s Division of Endocrinology, Diabetes, and Nutrition, where she also serves as the Associate Division Chief for Clinical Research, and the Director of the Precision Medicine and Population Health Program within the University of Maryland Institute for Health Computing.

Dr. McCoy is a physician scientist who - through clinical care, research, and advocacy - is dedicated to improving the quality, accessibility, and sustainability of diabetes care. She is particularly interested in understanding and addressing the structural factors that lead to suboptimal care and poor health with the goal of developing precision medicine tools and patient-centered care delivery models that improve health and wellbeing, while supporting the sustainability of the healthcare system. Dr. McCoy’s methodologic expertise is in the use of real-world data, including secondary analyses of administrative claims and electronic health record data; pragmatic point-of-care clinical trials; and population health research. She has been funded by the National Institutes of Health, the Patient-Centered Outcomes Research Institute, and the American Diabetes Association, and has authored over 160 peer-reviewed manuscripts.

Dr. McCoy is passionate about caring for patients and serving her community, training the next generation of clinicians and applied researchers, and driving practice transformation to achieve better health outcomes with greater efficiency and lower cost. During her time at Mayo Clinic (2015-2023), she led multiple efforts to improve care delivery through team-based primary care and community paramedicine. Dr. McCoy joined the University of Maryland family in August 2023 and is excited to work with faculty, students, and staff across the University of Maryland Baltimore, University of Maryland College Park (where she has an adjunct faculty position in the Department of Health Policy and Management of the University of Maryland School of Public Health), University of Maryland Baltimore County, University of Maryland Medical System (UMMS), and communities across Maryland to improve health through research, practice transformation, service, and education.

Research/Clinical Keywords

Type 1 diabetes, type 2 diabetes, obesity, comparative effectiveness and safety, patient-centered outcomes research, target trial emulation, community paramedicine, health equity, cost of care, population health, health policy, shared decision making

Highlighted Publications

Understanding, Predicting, and Preventing Diabetes Complications

McCoy RG, Van Houten HK, Ziegenfuss JY, Shah ND, Wermers RA, Smith SA.  Increased mortality of patients with diabetes reporting severe hypoglycemia. Diabetes Care. 2012 Sep; 35 (9):1897-901 

McCoy RG, Van Houten HK, Ziegenfuss JY, Shah ND, Wermers RA, Smith SA.  Self-report of hypoglycemia and health-related quality of life in patients with type 1 and type 2 diabetes. Endocr Pract. 2013 Sep-Oct; 19 (5):792-9 

McCoy RG, Van Houten HK, Ross JS, Montori VM, Shah ND.  HbA1c overtesting and overtreatment among US adults with controlled type 2 diabetes, 2001-13: observational population based study. BMJ. 2015 Dec 8; 351:h6138 

McCoy RG, Lipska KJ, Yao X, Ross JS, Montori VM, Shah ND.  Intensive Treatment and Severe Hypoglycemia Among Adults With Type 2 Diabetes. JAMA Intern Med. 2016 Jul 1; 176 (7):969-78 

McCoy RG, Lipska KJ, Herrin J, Jeffery MM, Krumholz HM, Shah ND.  Hospital Readmissions among Commercially Insured and Medicare Advantage Beneficiaries with Diabetes and the Impact of Severe Hypoglycemic and Hyperglycemic Events. J Gen Intern Med. 2017 Oct; 32 (10):1097-1105

McCoy RG, Ngufor C, Van Houten HK, Caffo B, Shah ND.  Trajectories of Glycemic Change in a National Cohort of Adults With Previously Controlled Type 2 Diabetes. Med Care. 2017 Nov; 55 (11):956-964 

Silbert R, Salcido-Montenegro A, Rodriguez-Gutierrez R, Katabi A, McCoy RG. Hypoglycemia Among Patients with Type 2 Diabetes: Epidemiology, Risk Factors, and Prevention Strategies. Curr Diab Rep. 2018 Jun 21; 18 (8):53 

Rodriguez-Gutierrez R, Gonzalez-Gonzalez JG, Zuniga-Hernandez JA, McCoy RG.  Benefits and harms of intensive glycemic control in patients with type 2 diabetes. BMJ. 2019 Nov 5; 367:l5887 

McCoy RG, Lipska KJ, Van Houten HK, Shah ND.  Association of Cumulative Multimorbidity, Glycemic Control, and Medication Use With Hypoglycemia-Related Emergency Department Visits and Hospitalizations Among Adults With Diabetes. JAMA Netw Open. 2020 Jan 3; 3 (1):e1919099 

McCoy RG, Galindo RJ, Swarna KS, Van Houten HK, O'Connor PJ, Umpierrez GE, Shah ND.  Sociodemographic, Clinical, and Treatment-Related Factors Associated With Hyperglycemic Crises Among Adults With Type 1 or Type 2 Diabetes in the US From 2014 to 2020. JAMA Netw Open. 2021 Sep 1; 4 (9):e2123471 

Rodriguez-Gutierrez R, Millan-Alanis JM, Barrera FJ, McCoy RG.  Value of Patient-Centered Glycemic Control in Patients with Type 2 Diabetes. Curr Diab Rep. 2021 Dec 13; 21 (12):63 

Galindo RJ, Ali MK, Funni SA, Dodge AB, Kurani SS, Shah ND, Umpierrez GE, McCoy RG.  Hypoglycemic and Hyperglycemic Crises Among U.S. Adults With Diabetes and End-stage Kidney Disease: Population-Based Study, 2013-2017. Diabetes Care. 2022 Jan 1; 45 (1):100-107 

McCoy RG, Mullan AF, Jeffery MM, Bucks CM, Clements CM, Campbell RL.  Excess All-Cause and Cause-Specific Mortality Among People with Diabetes During the COVID-19 Pandemic in Minnesota: Population-Based Study. J Gen Intern Med 2022 Sep; 37(12):3228-3231.

Myers LA, Swanson KM, Glasgow AE, McCoy RG.  Management and Outcomes of Severe Hypoglycemia Treated by Emergency Medical Services in the U.S. Upper Midwest. Diabetes Care. 2022 Aug 1; 45 (8):1788-1798

McCoy RG, Herrin J, Galindo RJ, Swarna KS, Umpierrez GE, Golden SH, O'Connor PJ. Rates of Hypoglycemic and Hyperglycemic Emergencies Among U.S. Adults With Diabetes, 2011-2020. Diabetes Care. 2023 Feb 1;46(2):e69-e71


Pharmacoepidemiology and Comparative Effectiveness/Safety

Zhang Y, McCoy RG, Mason JE, Smith SA, Shah ND, Denton BT.  Second-line agents for glycemic control for type 2 diabetes: Are newer agents better? Diabetes Care. 2014; 37(5):1338-45

Allen AM, Van Houten HK, Sangaralingham LR, Talwalkar JA, McCoy RG.  Healthcare Cost and Utilization in Nonalcoholic Fatty Liver Disease: Real-World Data From a Large U.S. Claims Database. Hepatology. 2018 Dec; 68 (6):2230-2238 

McCoy RG, Lipska KJ, Van Houten HK, Shah ND.  Paradox of glycemic management: multimorbidity, glycemic control, and high-risk medication use among adults with diabetes. BMJ Open Diabetes Res Care. 2020 Feb; 8 (1):e001007

Fan J, Jeffery MM, Hooten WM, Shah ND, McCoy RG.  Trends in Pain Medication Initiation Among Patients With Newly Diagnosed Diabetic Peripheral Neuropathy, 2014-2018. JAMA Netw Open. 2021 Jan 4; 4 (1):e2035632 

McCoy RG, Van Houten HK, Deng Y, Mandic PK, Ross JS, Montori VM, Shah ND.  Comparison of Diabetes Medications Used by Adults With Commercial Insurance vs Medicare Advantage, 2016 to 2019. JAMA Netw Open. 2021 Feb 1; 4 (2):e2035792 

McCoy RG, Van Houten HK, Karaca-Mandic P, Ross JS, Montori VM, Shah ND.  Second-Line Therapy for Type 2 Diabetes Management: The Treatment/Benefit Paradox of Cardiovascular and Kidney Comorbidities. Diabetes Care. 2021 Aug 4; 44(10):2302-2311

Deng Y, Polley EC, Wallach JD, Dhruva SS, Herrin J, Quinto K, Gandotra C, Crown W, Noseworthy P, Yao X, Lyon TD, Shah ND, Ross JS, McCoy RG.  Emulating the GRADE trial using real world data: retrospective comparative effectiveness study. BMJ. 2022 Oct 3; 379:e070717

Herges JR, Galindo RJ, Neumiller JJ, Heien HC, Umpierrez GE, McCoy RG.  Glucagon Prescribing and Costs Among U.S. Adults With Diabetes, 2011-2021. Diabetes Care. 2023 Mar 1; 46 (3):620-627

Herges JR, Haag JD, Kosloski-Tarpenning KA, Mara KC, McCoy RG. Gaps in Glucagon Fills among Commercially Insured Patients Receiving a Glucagon Prescription. Diabetes Res Clin Pract. 2023 Jun;200:110720

Herges JR, Haag JD, Kosloski-Tarpenning KA, Mara KC, McCoy RG. Glucagon prescribing and prevention of hospitalization for hypoglycemia in a large health system. Diabetes Res Clin Pract. 2023 Jul 13;202:110832

Deng Y, Polley EC, Wallach JD, Herrin J, Ross JS, McCoy RG. Comparative effectiveness of second line glucose lowering drug treatments using real world data: emulation of a target trial. BMJ Med. 2023 Aug 9;2(1):e000419

Wallach JD, Deng Y, Polley EC, Dhruva SS, Herrin J, Quinto K, Gandotra C, Crown W, Noseworthy P, Yao X, Jeffery MM, Lyon TD, Ross JS, McCoy RG.  Assessing the use of observational methods and real-world data to emulate ongoing randomized controlled trials. Clin Trials. 2023 Aug 17:17407745231193137


Community Paramedicine

Stickler ZR, Carlson PN, Myers L, Schultz JR, Swenson T, Darling C, Liedl C, McCoy RG.  Community Paramedic Mobile COVID-19 Unit Serving People Experiencing Homelessness. Ann Fam Med. 2021 Nov-Dec; 19 (6):562 

Ridgeway JL, Wissler Gerdes EO, Zhu X, Finnie DM, Wiepert LM, Glasgow AE, Torres AJ, Smith OA, Juntunen MB, Liedl CP, McCoy RG. A Community Paramedic Clinic at a Day Center for Adults Experiencing Homelessness. NEJM Catalyst Innovations in Care Delivery 2023; 04(4)


Social Determinants of Diabetes-Related Health Outcomes

Rodriguez-Gutierrez R, Herrin J, Lipska KJ, Montori VM, Shah ND, McCoy RG.  Racial and Ethnic Differences in 30-Day Hospital Readmissions Among US Adults With Diabetes. JAMA Netw Open. 2019 Oct 2; 2 (10):e1913249 

Kurani SS, Lampman MA, Funni SA, Giblon RE, Inselman JW, Shah ND, Allen S, Rushlow D, McCoy RG.  Association Between Area-Level Socioeconomic Deprivation and Diabetes Care Quality in US Primary Care Practices. JAMA Netw Open. 2021 Dec 1; 4 (12):e2138438 

Kurani SS, Heien HC, Sangaralingham LR, Inselman JW, Shah ND, Golden SH, McCoy RG.  Association of Area-Level Socioeconomic Deprivation With Hypoglycemic and Hyperglycemic Crises in US Adults With Diabetes. JAMA Netw Open. 2022 Jan 4; 5 (1):e2143597

Jiang DH, Herrin J, Van Houten HK, McCoy RG. Evaluation of High-Deductible Health Plans and Acute Glycemic Complications Among Adults With Diabetes. JAMA Netw Open. 2023 Jan 3;6(1):e2250602


Machine Learning and Artificial Intelligence in Health Care

Ngufor C, Van Houten H, Caffo BS, Shah ND, McCoy RG.  Mixed effect machine learning: A framework for predicting longitudinal change in hemoglobin A1c. J Biomed Inform. 2019 Jan; 89:56-67 

Yao X, Rushlow DR, Inselman JW, McCoy RG, Thacher TD, Behnken EM, Bernard ME, Rosas SL, Akfaly A, Misra A, Molling PE, Krien JS, Foss RM, Barry BA, Siontis KC, Kapa S, Pellikka PA, Lopez-Jimenez F, Attia ZI, Shah ND, Friedman PA, Noseworthy PA.  Artificial intelligence-enabled electrocardiograms for identification of patients with low ejection fraction: a pragmatic, randomized clinical trial. Nat Med. 2021 May; 27 (5):815-819 


Care Delivery Models to Support High Quality Diabetes Care

Rodriguez-Gutierrez R, McCoy RG.  Measuring What Matters in Diabetes. JAMA. 2019 May 21; 321 (19):1865-1866 

Jiang DH, O'Connor PJ, Huguet N, Golden SH, McCoy RG.  Modernizing Diabetes Care Quality Measures. Health Aff (Millwood). 2022 Jul; 41 (7):955-962 Epub 2022 June 27

Herges JR, Matulis JC 3rd, Kessler ME, Ruehmann LL, Mara KC, McCoy RG. Evaluation of an Enhanced Primary Care Team Model to Improve Diabetes Care. Ann Fam Med. 2022 Nov-Dec;20(6):505-511

Additional Publication Citations

Research Interests

My work relies on using real-world data (e.g., claims, electronic health records [EHR], surveys, and qualitative data) and a wide range of observational (i.e., epidemiologic, causal inference, and machine learning), interventional (i.e., pragmatic, point-of-care clinical trials), and mixed methods study designs to 1) characterize and predict high-risk subpopulations; 2) identify treatment strategies that yield optimal health outcomes with least burden of treatment, risk of harm, and cost; 3) operationalize equitable and sustainable delivery of person-centered care in both clinical and community settings; and 4) facilitate patient/stakeholder engagement in research. My focus is therefore both thematic (on diabetes and primary care delivery and health outcomes) and methodologic (on use of real-world data for epidemiologic, comparative effectiveness, and population health research). My recent work has focused on 1) epidemiology and prediction of diabetes complications; 2) impacts of social determinants of health (e.g. area-level deprivation, rurality, income, health benefit design) on diabetes management and outcomes and the disparities experienced by people from racial and ethnic minoritized, rural, and low income groups; 3) comparative effectiveness/safety of diabetes and osteoporosis medications; 4) use of real-world data to emulate clinical trials under the target trial framework; and 5) development, implementation, and evaluation of care models to improve patient care, specifically community paramedicine, integration of primary and specialty care, comprehensive primary care, and care transitions programs for older adults.

Awards and Affiliations


John Harvard Scholarship for Academic Excellence, Harvard University (2002, 2003, 2004)

Phi Beta Kappa, Harvard University, awarded for academic excellence (2003)

Christensen Prize for Outstanding Research, Department of Chemistry, Harvard University, awarded for research excellence (2003)

Thomas T. Hoopes Prize, Harvard University, Awarded to 74 undergraduate students upon the defense of their senior theses in recognition of outstanding scholarly work or research (2004)

Lawrence J. Henderson Prize, Best Senior Thesis in Biochemical Sciences, Department of Biochemical Sciences, Harvard University (2004)

Franklin Paine Mall Award, Johns Hopkins University School of Medicine, awarded for academic excellence as the top ranking medical student in the first year class (2005)

Henry Strong Denison Award, Medical Research, Johns Hopkins University School of Medicine, awarded for excellence in research (2007)

Outstanding Research Award, American College of Physicians (2007)

Fellows Outstanding Research Award, National Heart Lung and Blood Institute, NIH (2007)

American Medical Association Physician of Tomorrow Scholarship (2008)

Alpha Omega Alpha, Johns Hopkins University School of Medicine (2009)

Edward C. Rosenow Endowed Professorship Internal Medicine Residency Research Award, Mayo Clinic, awarded for excellence in research (2011)

General Mills Foundation Clinician-Investigator Fellowship (2012)

Delivery System Science Fellowship, AcademyHealth (2013)

Health Care Delivery Scholar, Robert D and Patricia E Kern Center for the Science of Health Care Delivery, Mayo Clinic  (2015-2019)

Top Performing Provider Award in Patient Experience, Mayo Clinic, awarded for being in the top 1% of all clinicians across Mayo Clinic for patient experience (awarded for the 2020 and 2022 practice years)

Mayo Clinic Medical Transport Excellence in EMS Award, awarded by nomination from front-line Mayo Clinic Ambulance team members for commitment to the highest standards in patient care, quality, efficiency, and safety (2021)

American Diabetes Association (ADA) Interest Group Abstract Award in the category of Health Care Delivery & Quality Improvement (2022)

Minnesota Rural Health Hero Award, awarded by the Minnesota Department of Health for pioneering community paramedicine as a care delivery model to care for people experiencing homelessness, rural populations with diabetes, and other underserved populations (2022)

Rochester Mayor’s Medal of Honor Human Services Award, awarded for service to the community, establishing a clinic for people experiencing homelessness, and delivering medical care to vulnerable members of the Rochester, MN community (2022)

Chabad on Call Healthcare Hero Award, awarded by the national Chabad on Call organization upon nomination by Chabad Lubavitch of Southern Minnesota for service to the local community (2022)

 E. Drewry Henderson Award, Zumbro Valley Medical Society, awarded in recognition of caring for people experiencing homelessness and leadership of the Mayo Clinic Ambulance Community Paramedic Service (2023)

Award for Research Data Stewardship shared with OptumLabs for work predicting the risk of severe hypoglycemic and hyperglycemic events in adults with diabetes. Future of Privacy Forum (2023)


2006-2007       HHMI-NIH Research Scholar, National Heart Lung and Blood Institute, Bethesda, MD

2015-2019       Senior Associate Consultant, Division of Community Internal Medicine, Geriatrics and Palliative Care, Department of Internal Medicine, Mayo Clinic, Rochester, MN. Joint Appointment in the Division of Health Care Policy & Research, Department of Health Sciences Research. Joint Appointment in the Section of Geriatric Medicine and Gerontology, Department of Internal Medicine

2019-2023       Consultant, Division of Community Internal Medicine, Geriatrics and Palliative Care, Department of Internal Medicine, Mayo Clinic, Rochester, MN. Joint Appointment in the Division of Health Care Delivery Research, Department of Quantitative Health Sciences

2020−2023       Medical Director, Mayo Clinic Ambulance Community Paramedic Service, Rochester, MN

2023-present   Supplemental (Adjunct) Research Faculty, Division of Community Internal Medicine, Geriatrics and Palliative Care, Department of Internal Medicine, Mayo Clinic, Rochester, MN

2023-present   Associate Division Chief for Clinical Research, Division of Endocrinology, Diabetes, and Nutrition, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD

2023-present   Director, Precision Medicine and Population Health, University of Maryland Institute for Health Computing, Bethesda, MD

2023−present  Adjunct Associate Professor, Department of Health Policy and Management, University of Maryland School of Public Health, College Park, MD 

Grants and Contracts

American Diabetes Association
Fraze (PI); Role: Co-Investigator
Improving Disparities in Diabetes Management and Outcomes: Implementation of Comprehensive Primary Care

R01 AG 79113
Brito/McCoy (PI)
Comparative Effectiveness and Safety of Osteoporosis Drug Therapies

R37 CA 272473
Brito (PI); Role: Co-Investigator
De-implementation of inappropriate thyroid ultrasound

R01 DK 129616
Lipska (PI); Role: Site-PI
QBSafe: a randomized trial of a novel intervention to improve the care of people living with type 2 diabetes

McCoy (PI)
Second-Line Therapies for Patients with Type 2 Diabetes and Moderate Cardiovascular Disease Risk

Mayo Clinic Pragmatic Clinical Trials Award
McCoy (PI)
Community Paramedic Hospitalization Reduction and Mitigation Program: Pragmatic RCT

U01 FD005938
Ross/Jeffery (PI); Role: Co-Investigator
09/01/2023 – 08/31/2028
Yale-Mayo Center for Regulatory Science and Innovation

R03 HS 28060
Barreto (PI); Role: Co-Investigator
Enhanced kidney follow-up for AKI survivors in Care Transitions (the ACT Study)

K23 DK114497
McCoy (PI)
Predicting the Risk of Severe Hypoglycemic and Hyperglycemic Events in Adults with Diabetes

R03 DK127010
McCoy (PI)
Community Paramedicine Program to Improve Diabetes Management among Adults Experiencing Severe Hypoglycemia

AARP Quality Measure Innovation Grant
McCoy (PI)
Appropriateness of Glucose-lowering Therapy among Adults with Diabetes Mellitus

In the News

Professional Activity

ADA Professional Practice Committee member (co-author on the ADA Standards of Care), 2023-2024

Member of the planning committees for the 2024 ADA Scientific Sessions (Hypoglycemia Theme) and the 2024 Clinical Updates Conference

Editorial Board member, BMJ Medicine

Minnesota Department of Health (MDH) Center of Excellence on Public Health and Homelessness, Advisory Group member

ADA Primary Care Advisory Group, member of the leadership team

Member, OptumLabs® Partner Research for Equitable System Transformation After COVID-19 (PRESTAC) Health Equity Collaborative

MDH Minnesota Cardiovascular Health and Diabetes State Plan 2030, work-group member

ADA Diabetes in Primary Care Interest Group leadership team, Advisor (2018-2020), Chair-Elect (2020-2022), Chair (2022-2024)

AcademyHealth Quality and Value Interest Group, Advisory Committee member-at-large (2016-2019), Chair (2019-2020), Immediate-past Chair (2020-2021)