Dr. Ko Harada joined the Department of Medicine in Hospital Medicine at Washington University School of Medicine as an Instructor in July 2026, practicing clinically at Barnes-Jewish Hospital. He is a board-certified internal medicine physician and geriatrician, with broad training across inpatient medicine, geriatric medicine, and clinical research.
Dr. Harada received his medical degree from Okayama University School of Medicine in Japan and completed a Ph.D. in General Medicine at Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences. He subsequently completed internal medicine residency training at Mount Sinai Beth Israel in New York. He later pursued fellowship training at the Icahn School of Medicine at Mount Sinai. Dr. Harada is an active clinician-scientist with a strong research focus on population-based and outcomes research relevant to inpatient and chronic disease care. As a chief investigator, he has led multiple international epidemiologic studies examining mortality trends in diseases such as dementia, idiopathic pulmonary fibrosis, nontuberculous mycobacterial disease and sarcoidosis. In addition to his clinical and research work, Dr. Harada is committed to medical education and has received multiple awards recognizing excellence in teaching and research.
Education
- MD: Okayama University School of Medicine, Okayama, Japan (2016)
- PhD: Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama, Japan (2020)
- Residency, Internal Medicine: Department of Medicine at Mount Sinai Beth Israel, New York, NY (2024)
Clinical Interests
High-quality inpatient care, the management of medically complex patients, surgical co-management, care for older adults, and effective interdisciplinary collaboration, optimizing care delivery for hospitalized adults through evidence-based practice, comprehensive care, and shared decision-making in acute care settings
Selected Publications
Harada K, Nishimura Y, Vu QT, Yamamoto M, Toshihiro K, Hagiya H. Global trends in idiopathic pulmonary fibrosis mortality rates during 2001–2022. ERJ Open Res 2025; in press
Harada K, Vu QT, Nishimura Y, Takeda T, Hamano H, Minato Y, Zamami Y, Koyama T, Hagiya H. Trends in nontuberculous mycobacterial disease mortality based on 2000-2022 data from 83 countries. Int J Infect Dis. 2025; in press.
Vu QT, Nishimura Y, Harada K, Ito H, Higashionna T, Maruo A, Harada K, Takeda T, Hamano H, Zamami Y, Hagiya H, Koyama T. International trends in biliary tract cancer-related mortality, 2000–2022: An observational study of the World Health Organization mortality database. Hepatology. 2024; in press.
Fujiwara S, Leibovitch E, Harada K, Nishimura Y, Woo R, Otsuka F, Bhagavathula AS. Trends in adverse effects of medical treatment in Paediatric populations in the United States: A global burden of disease study, 2000-2019. Paediatr Perinat Epidemiol. 2024;38(8):692-699.
Vu QT, Harada K, Nishimura Y, Hagiya H, Tan E, Lehasa OME, Zamami Y, Koyama T. Burden of depressive disorders in Vietnam from 1990 to 2019: A secondary analysis of the Global Burden of Disease Study 2019. J Psychiatr Res. 2024;172:420-426.
Fujiwara S, Harada K, Hagiya H, Koyama T, Hasegawa K, Tsukahara H, Otsuka F. Trends in childhood obesity in Japan: A nationwide observational study from 2012 to 2021. Clin Obes. 2024;14(2):e12636.
Koyama T, Iinuma S, Yamamoto M, Niimura T, Osaki Y, Nishimura S, Harada K, Zamami Y, Hagiya H. International Trends in Adverse Drug Event-Related Mortality from 2001 to 2019: An Analysis of the World Health Organization Mortality Database from 54 Countries. Drug Saf. 2024;47(3):237-249.
Kobayashi T, Tomoi H, Nishina Y, Harada K, Tanaka K, Sasaki S, Inaba K, Mitaka H, Takahashi H, Passanante A, Lin L, Lau E, Wu JT, Naito T, Karson HD, Yamada Y. Effect of a Mobile App Chatbot and an Interactive Small Group Webinar on COVID-19 Vaccine Intention and Confidence in Japan: A Randomized Clinical Trial. BMJ Glob Health. 2023;8(5):e010370.
Higashionna T, Harada K, Maruo A, Niimura T, Tan E, Vu QT, Kawabata T, Ushio S, Hamano H, Kajizono M, Zamami Y, Ishizawa K, Harada K, Hinotsu S, Kano MR, Hagiya H, Koyama T. Trends in Head and Neck Cancer Mortality from 1999 to 2019 in Japan: An Observational Analysis. Cancers (Basel). 2023;26;15(15):3786.
Otsuka Y, Hagiya H, Fukushima S, Harada K, Koyama T, Otsuka F. Trends in the Incidence of Japanese Spotted Fever in Japan: A Nationwide, Two-Decade Observational Study from 2001-2020. Am J Trop Med Hyg. 2023;108(4):701-704.
Harada K, Hagiya H, Koyama T, Otsuka F. Trends in sarcoidosis mortality rate in Japan from 2001 to 2020: A population-based study. Respir Med. 2022;196:106828
Kobayashi T, Nishina Y, Tomoi H, Harada K, Tanaka K, Matumoto E, Horimukai K, Ishihara J, Sasaki S, Inaba K, Seguchi K, Takahashi H, Salinas J, Yamada Y, Corowa-kun: Impact of a COVID-19 vaccine information chatbot on vaccine hesitancy, Japan 2021. Vaccine. 2022;40(32):4654-4662
Koyama T, Higashionna T, Maruo A, Ushio S, Zamami Y, Harada K, Hagiya H. Trends in places and causes of death among centenarians in Japan from 2006 to 2016. Geriatr Gerontol Int. 2022;22(8):675-680
Harada K, Hagiya H, Koyama T, Otsuka F, Trends in the amyloidosis mortality rate in Japan: A nationwide observational study, 1998-2019. Geriatr Gerontol Int. 2022;22(3):246-250
Harada K, Hagiya H, Funahashi T, Koyama T, Kano M, Otsuka F. Trends in the nontuberculous mycobacterial disease mortality rate in Japan: A nationwide observational study, 1997-2016. Clin Infect Dis. 2021;73(2):e321-e326
Funahashi T, Koyama T, Hagiya H, Harada K, Iinuma S, Ushio S, Zamami Y, Niimura T, Shinomiya K, Ishizawa K, Sendo T, Hinotsu S, Kano MR. Population-Based Observational Study of Adverse Drug Event-Related Mortality in the Super-Aged Society of Japan. Drug Saf. 2021;44(5):531-53
Harada K, Hanayama Y, Obika M, Itoshima K, Okada K, Otsuka F. Clinical relevance of insulin-like growth factor-1 to cardiovascular risk markers. Aging male. 2020; 23(5):1030-1038
Selected Poster Presentations
Harada K, Wang Y, Hung W, Rosen G, Baim-Lance A, Lerner S, Chow S, Ko F. (May 2025) Impact of Geriatric Co-Management on Kidney Transplant Eligibility in Older Adults with Advanced CKD. American Geriatrics Society 2025; Chicago, IL.
Harada K, Vu QT, Yamamoto M, Koyama T, Yamada Y. (May 2025). The Growing Burden of Idiopathic Pulmonary Fibrosis in Older Adults: Global Mortality Trends. American Geriatrics Society 2025; Chicago, IL.
Ortiz R, Perez-Benzo G, Dhalla P, Harada K, Guilliames C, Droz R, and Yamada Y. (May 2025) Targeted educational intervention and creation of a pocket pain card to improve pain management of older adults admitted to an orthopedic service. American Geriatrics Society 2025; Chicago, IL
Chow S, Wang Y, Hung W, Baim-Lance A, Harada K, Coyne D, Ko F. (May 2025) ALIGNing-CARE in Geriatric Surgery Co-Management: Pre-operative Phase. American Geriatrics Society 2025; Chicago, IL.
Nishimura Y, Fujii M, Sako N, Vu QT, Harada K, Hagiya H, Durani U, Ansell SM, Cerhan JR, Koyama T. (May 2025) Racial/ethnic disparities in neoplasm mortality and the role of healthcare access in the United States: Insights from the Global Burden of Disease study 2000–2019. The American Society of Clinical Oncology 2025 Annual Scientific Meeting; Chicago, IL.
Harada K, Koyama T, Yamada Y. (Nov 2025). Global Trends in Fall-Related Injuries: A Three-Decade Analysis. Gerontological Society of America 2024 Annual Scientific Meeting, Seattle, WA
Harada K, Hagiya H, Koyama T. (May 2024). Increase in influenza mortality rate in the older population: a longitudinal epidemiological study from the WHO Mortality Database. American Geriatrics Society 2024, Virtual
Harada K, Shichijo Y, Ko F, Lerner S, Rosen G, Chow S. (May 2024). The prevalence of geriatric syndromes among older adults with advanced chronic kidney disease seeking kidney transplant. American Geriatrics Society 2024, Virtual
Yang Y, Bava H, Go K, Harada K, Kim B, Chernayavsky S. (April 2024). A case of West Nile neuroinvasive disease with a long hospital course. Society of hospital medicine 2024; San Diego, CA
Yamada Y, Harada K, Ko F, Chai E, Suarez-Rodriguez L, Wedderburn R, Amir O. (November 2023) Geriatrics Trauma Co-Management: Preliminary Descriptive Data from a Single Academic Institution. Gerontological Society of America 2023; Tampa, FL