Department of Health Policy and Management, School of Medicine, Keio University



Sumie Ikezaki and Naoki Ikegami. Predictors of dying at home for patients receiving nursing services in Japan: A retrospective study comparing cancer and non-cancer deaths. BMC Palliative Care, 10:3, 2011

Michael R Reich, Naoki Ikegami, Kenji Shibuya, Keizo Takemi. 50 years of pursuing a healthy society in Japan. Lancet, 378(9796), p1051-1053, 2011.9

Naoki Ikegami, Byung-Kwang Yoo, Hideki Hashimoto, Masatoshi Matsumoto, Hiroya Ogata, Akira Babazono, Ryo Watanabe, Kenji Shibuya, Bong-Min Yang, Michaerl R Reich, Yasuki Kobayashi. (Japan: Universal Health Care at 50 Years. Series 2) Japanese universal health coverage: evolution, achievements, and challenges. Lancet, 378(9796), p1106-111, 2011.9

Hideki Hashimoto, Naoki Ikegami, Kenji Shibuya, Nobuyuki Izumida, Haruko Noguchi, Hideo Yasunaga, Hiroaki Miyata, Jose M Acuin, Michael R Reich. (Japan: Universal Health Care at 50 years. Series 3) Cost containment and quality of care in Japan: is there a trade-off ? Lancet, 378(9797), p1174-1182, 2011.9

Nanako Tamiya, Haruko Noguchi, Akihiro Nishi, Michael R Reich, Naoki Ikegami, Hideki Hashimoto, Kenji Shibuya, Ichiro Kawachi, John Creighton Campbell. (Japan: Universal Health Care at 50 years. Series 4) Population ageing and wellbeing: lessons from Japan's long-term care insurance policy. Lancet, 378(9797), p1183-1192, 2011.9

Kenji Shibuya, Hideki Hashimoto, Naoki Ikegami, Akihiro Nishi, Tetsuya Tanimoto, Hiroaki Miyata, Keizo Takemi, Michael R Reich. (Japan: Universal Health Care at 50 Years. Series 6) Future of Japan's system of good health at low cost with equity: beyond universal coverage. Lancet, 378(9798), p1265-1273, 2011.10


John Creighton Campbell, Naoki Ikegami and Mary Jo Gibson. Lessons from public Long-term care insurance in Germany and Japan. Health Affairs, 29(1), p87-95, 2010

Naoki Ikegami and Sumie Ikezaki. Life sustaining treatment at end-of-life in Japan: Do the perspectives of the general public reflect those of the bereaved of patients who had died in hospitals? Health Policy, 98(2-3),98-106, 2010

Tomoaki Ishibashi and Naoki Ikegami. Should the provision of home help services be contained? : Validation of the new preventive care policy in Japan. BMC Health Services Research, 10: 224, 2010

Naoki Tomita, Kimio Yoshimura and Naoki Ikegami. Impact of home and community-based services on hospitalisation and institutionalisation among individuals eligible for long-term care insurance in Japan. BMC Health Serv Res, 10: 345, 2010


Naoki Ikegami. Games policy makers and providers play: Introducing case-mix-based payment to hospital chronic care units in Japan. Journal of Health Politics, Policy and Law, 34 (3), p361-380, 2009

John Creighton Campbell, Naoki Ikegami and Soonman Kwon. Policy learning and cross-national diffusion in social long-term care insurance: Germany, Japan, and the Republic of Korea. International Social Security Review, 62(4), p63-80, 2009

Ayumi Igarashi, Naoki Ikegami, Yukari Yamada and Noriko Yamamoto-Mitani. Effect of the Japanese preventive-care version of the Minimum Data Set-Home Care on the health-related behaviors of community-dwelling, frail older adults and skills of preventive-care managers: A quasi-experimental study conducted in Japan. Geriatrics Gerontology International, 9(3), p310-319, 2009

Katherine Berg, Harriet Finne-Soveri, Len Gray, Jean Claude Henrard, John Hidrdes, Naoki Ikegami, et al. Relationship between interRAI HC and the ICF: opportunity of operationalizing the ICF. BMC Health Services Research, 9: 47, 2009

Zhanlian Feng, Hohn P. Hirdes, Trevor F. Smith, Harriet Finne-Soveri, Iris Chi, Jean-Noel Du Pasquier, Ruedi Gilgen, Naoki Ikegami and Vincent Mor. Use of physical restraints and antipsychotic medications in nursing homes: a cross-national study. International Journal of Geriatric Psychiatry, 24(10), p1110-8, 2009

Li H, Borinskaya S, Yoshimura K, Kal'ina N, Marusin A, Stepanov VA, et al. Refined geographic distribution of the oriental. ALDH2*504Lys (nee 487Lys)  variant. Ann Hum Genet, 73(Pt3), p335-45, 2009

Saroko Ezoe, Masahiro Toda, Kimio Yoshimura, Aki Naritomi, Rei Den and Kanehisa Morimoto. Relationships of personality and lifestyle with moble phone dependence among female nursing students. Social behavior and personality, 37(2), 231-238, 2009

John Creighton Campbell and Naoki Ikegami. [Chapter 10] Comprehensive Long-Term Care in Japan and Germany. Theodore R. Marmor, et al (Eds.): Policy learning and cross-national comparison, Comparative Studies and the Politics of Modern Medical Care. P265-288, Yale University Press, New Haven, 2009

Naoki Ikegami. [Chapter 6] International Gerontology Asia: Japan. Jeffrey B. Halter, et al(Eds.): Hazzard's Geriatric Medicine and Gerontology-6th ed. P85-87, The McGraw-Hill Companies Inc, NY, 2009


Naoki Ikegami. The Japanese health care system: Its success and challenges for the future. Harvard Health Policy Review, 9(1), p110-117, 2008

Naoki Ikegami. Japan's long-term care insurance. British Journal of Healthcare Management, 14(12), p548-551, 2008

John Creighton Campbell and Naoki Ikegami. Review of Health Care Issues in the United States and Japan. The Journal of Japanese Studies, 34(1), p133-137, 2008

Mabuchi F, Yoshimura K, Kashiwagi K, Shioe K, Yamagata Z, et al. High prevalence of anxiety and depression in patients with primary open-angle glaucoma. J Glaucoma, 217(7), p552-7, 2008

Ochiai H, Nakanishi Y, Fukasawa Y, Sato Y, Yoshimura K, et al. A new formula for predicting liver metastasis in patients with colorectal cancer: immunohistochemical analysis of a large series of 439 surgically resected cases, Oncology, 75(1-2), p32-41, 2008

Ohnami S, Sato Y, Yoshimura K, Ohnami S, Sakamoto H, et al. His595Tyr polymorphism in the methionine synthase reductase (MTRR) gene is associated with pancreatic cancer risk. Gastroenterology, 35(2), p477-88, 2008

Study Group of Millennium Genome Project for Cancer, Sakamoto H, Yoshimura K, et al., Genetic variation in PSCA is associated with susceptibility to diffuse-type gastric cancer. Nat Genet, 40(6), p730-40, 2008

Naoki Ikegami and John Creighton Campbell. (Editorial) Dealing with the medical axis-of-power: the case of Japan. Health Economics, Policy and Law, 3(Part2), p107-113, 2008

Naoki Ikegami. Long-Term-Care Financing: International Perspective. Capezuti EA, et al (Eds.): The Encyclopedia of Elder Care: the comprehensive resource on geriatric and social care. P482-484, Springer Publishing Company, NY, 2008

Naoki Ikegami. (Chapter 58)Providing care for the ageing society. Florian Coulmas, et al (Eds.): The Demographic challenge: A Handbook about Japan. P1049-1064, Koninklijke Brill NV, Leiden, 2008

Naoki Ikegami. Merging of primary and tertiary prevention in the aging society - The case of Japan. Bruce Rosen, et al (Eds.): Health Systems: Are we in a Post Reform Era? P31-50, The Israel National Institute of Health Policy and Health Services Research, Tel Hashomer, 2008

Naoki Ikegami. Health system of Japan. Kris Heggenhougen and Stella Quah (Eds.): International Encyclopedia of Public Health Vol.4. P1-8, Academic Press, San Diego, 2008


Naoki Ikegami. The Japanese health care system--Achieving equity and containing costs through a single payment system. American Heart Hospital Journal , 5(1), p27-31, 2007

Naoki Ikegami. Rationale, design and sustainability of Long-Term Care Insurance in Japan- In retrospect. Social Policy & Society, 6(3), p423-434, 2007


Hideki Hashimoto, Haruko Noguchi, Paul Heidenreich, Olga Saynina, Abligail Moreland, Shunichi Miyazaki, Shunya Ikeda, Yoshihiro Kaneko and Naoki Ikegami. The diffusion of medial technology, local conditions, and technology re-invention: A comparative case study on coronary stenting. Health Policy, 79, p221-230, 2006

Hiroyuki Sakamaki, Shunya Ikeda, Naoki Ikegami, Yasuko Uchigata, Yasuhiko Iwamoto, et al. Measurement of HRQL Using EQ-5D in Patients with Type 2 Diabetes Mellitus in Japan,. Value in Health, 9(1), p47-53, 2006

Naoki Ikegami. Should providers be allowed to extra bill for uncovered services? Debate, resolution, and sequel in Japan. Journal of Health Politics, Policy and Law, 31(6), p1129-1149, 2006

Robin Gaould, Naoki Ikegami, Michael D, Barr, Tung-Liang Chiang, Derek Gould, et al. Advanced Asia's health systems in comparison. Health Policy, 79(2-3), p325-356, 2006

Shigeki Nawata, Keita Yamauchi and Naoki Ikegami. Do staffing levels determine outcome in psychiatric inpatient care--Factors related to the ratio of period hospitalized in Japan. Psychiatry and Clinical Neurosciences, 60(6), p709-717, 2006

Shikishima C, Ando J, Ono Y, Toda T, Yoshimura K. Registry of adolescent and young adult twins in the Tokyo area. Twin Res Hum Genet, 9(6), p811-816, 2006

Yamamoto S, Yoshimura K, Ri S, Fujita S, Akasu T, Moriya Y. The risk of multiple primary malignancies with colorectal carcinoma. Dis Colon Rectum, 49(10S), p30-36, 2006

Sato Y, Suganami H, Hamada C, Yoshimura I, Sakamoto H, Yoshida T, Yoshimura K. The confidence interval of allelic odds ratios under the Hardy-Weinberg disequilibrium. J Hum Genet, 51(9), p772-80, 2006

Yamagata S, Suzuki A, Ando J, Ono Y, Kijima N, Yoshimura K, Ostendorf F, Angleitner A, Riemann R, Spinath FM, Livesley WJ, Jang KL. Is the genetic structure of human personality universal? A cross-cultural twin study from North America, Europe, and Asia. J Pers Soc Psychol, 90(6), p987-98, 2006

Hirofumi Oyama, Yutaka Ono, Naoki Watanabe, Eriko Tanaka, Seijiro Kodoh, Tomoe Sakashita, Shiniji Sakamoto, Keiko Keichi, Kyoko Satoh, Kenji Nakamura and Kimio Yoshimura. Local community intervention through depression screening and group activity for elderly suicide prevention. Psychiatry and clinical neurosciences, 60, 110-114, 2006

Naoki Ikegami. PartV-16 Tokyo: A Path breaker in Long-Term Care? Victor G, et al (Eds.): Growing Older in World Cities: New York, London Paris, and Tokyo. P301-303, Vanderbilt University Press, Nashville, 2006