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Naoki Ikegami

Naoki Ikegami

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Social Sciences and Humanities
Japan
2026

D-Index & Metrics

Social Sciences and Humanities

D-Index
46
Citations
10020
World Ranking
3588
National Ranking
7

Naoki Ikegami publication distribution in Social Sciences and Humanities in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Social Sciences and Humanities in 2026. The highlighted bar marks where Naoki Ikegami sits on this spectrum.

44–53 publications: 28 scientists 54–63 publications: 61 scientists 64–73 publications: 161 scientists 74–83 publications: 225 scientists 84–93 publications: 301 scientists 94–103 publications: 390 scientists 104–113 publications: 406 scientists 114–123 publications: 474 scientists 124–133 publications: 453 scientists 134–143 publications: 434 scientists 144–153 publications: 407 scientists 154–163 publications: 411 scientists 164–173 publications: 391 scientists 174–183 publications: 313 scientists 184–193 publications: 319 scientists 194–203 publications: 304 scientists 204–213 publications: 285 scientists 214–223 publications: 246 scientists 224–233 publications: 213 scientists 234–243 publications: 170 scientists 244–253 publications: 167 scientists 254–263 publications: 162 scientists 264–273 publications: 138 scientists 274–283 publications: 138 scientists 284–293 publications: 113 scientists 294–303 publications: 106 scientists 304–313 publications: 95 scientists 314–323 publications: 101 scientists 324–333 publications: 81 scientists 334–343 publications: 69 scientists 344–353 publications: 56 scientists 354–363 publications: 36 scientists 364–373 publications: 42 scientists 374–383 publications: 41 scientists 384–393 publications: 44 scientists 394–403 publications: 27 scientists 404–413 publications: 30 scientists 414–423 publications: 20 scientists 424–433 publications: 29 scientists 434–443 publications: 29 scientists 444–453 publications: 25 scientists 454–463 publications: 19 scientists 464–473 publications: 21 scientists 474–483 publications: 11 scientists 484–493 publications: 17 scientists 494–503 publications: 7 scientists 504–513 publications: 6 scientists 514–523 publications: 12 scientists 524–533 publications: 10 scientists 534–543 publications: 7 scientists 544–553 publications: 6 scientists 554–563 publications: 12 scientists 564–569 publications: 8 scientists 570+ publications: 100 scientists
44 publications 570+

This scientist: 194 publications — 62nd percentile

62% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 570 publications or more.

Naoki Ikegami D-index placement in Social Sciences and Humanities in 2026

The chart shows the D-index (discipline H-index) distribution of Social Sciences and Humanities scientists ranked by Research.com in 2026. The highlighted bar marks where Naoki Ikegami sits on this spectrum.

30 D-Index: 177 scientists 31 D-Index: 210 scientists 32 D-Index: 222 scientists 33 D-Index: 188 scientists 34 D-Index: 181 scientists 35 D-Index: 243 scientists 36 D-Index: 261 scientists 37 D-Index: 272 scientists 38 D-Index: 278 scientists 39 D-Index: 300 scientists 40 D-Index: 297 scientists 41 D-Index: 308 scientists 42 D-Index: 313 scientists 43 D-Index: 300 scientists 44 D-Index: 269 scientists 45 D-Index: 260 scientists 46 D-Index: 228 scientists 47 D-Index: 251 scientists 48 D-Index: 203 scientists 49 D-Index: 186 scientists 50 D-Index: 187 scientists 51 D-Index: 166 scientists 52 D-Index: 138 scientists 53 D-Index: 141 scientists 54 D-Index: 131 scientists 55 D-Index: 137 scientists 56 D-Index: 109 scientists 57 D-Index: 129 scientists 58 D-Index: 95 scientists 59 D-Index: 105 scientists 60 D-Index: 106 scientists 61 D-Index: 86 scientists 62 D-Index: 94 scientists 63 D-Index: 77 scientists 64 D-Index: 79 scientists 65 D-Index: 59 scientists 66 D-Index: 68 scientists 67 D-Index: 51 scientists 68 D-Index: 49 scientists 69 D-Index: 40 scientists 70 D-Index: 43 scientists 71 D-Index: 40 scientists 72 D-Index: 50 scientists 73 D-Index: 46 scientists 74 D-Index: 43 scientists 75 D-Index: 45 scientists 76 D-Index: 45 scientists 77 D-Index: 30 scientists 78 D-Index: 25 scientists 79 D-Index: 31 scientists 80 D-Index: 29 scientists 81 D-Index: 18 scientists 82 D-Index: 21 scientists 83 D-Index: 26 scientists 84 D-Index: 15 scientists 85 D-Index: 15 scientists 86 D-Index: 19 scientists 87 D-Index: 19 scientists 88 D-Index: 12 scientists 89 D-Index: 7 scientists 90 D-Index: 19 scientists 91 D-Index: 20 scientists 92 D-Index: 13 scientists 93 D-Index: 9 scientists 94 D-Index: 13 scientists 95 D-Index: 8 scientists 96 D-Index: 7 scientists 97 D-Index: 6 scientists 98 D-Index: 6 scientists 99 D-Index: 6 scientists 100+ D-Index: 97 scientists
30 D-Index 100+

This scientist: 46 D-Index — 55th percentile

55% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 100 D-Index or more.

Research.com Recognitions

  • 2026 - Research.com Social Sciences and Humanities in Japan Leader Award
  • 2025 - Research.com Social Sciences and Humanities in Japan Leader Award
  • 2023 - Research.com Social Sciences and Humanities in Japan Leader Award
  • 2022 - Research.com Social Sciences and Humanities in Japan Leader Award

Overview

Naoki Ikegami is affiliated with Keio University in Japan. Their academic profile includes contributions to various fields associated with their institution.

Although specific details about their research papers, co-authors, and publication venues are not listed, their connection to Keio University positions them within a well-established academic environment known for diverse research activities.

There is no detailed record of main fields or subfields of study, nor topics explicitly connected to their work available from the data. This limits the ability to outline precise thematic areas or trends in their academic focus.

Naoki Ikegami's profile does not include information on awards, book publications, or other forms of academic recognition in the provided source.

The absence of recent papers or publication records in the data suggests either limited publicly cataloged output or a focus on non-published or less indexed scholarly activities.

Without noted co-authors or specific publication venues, it is not possible to describe the collaborative or dissemination patterns of their research at this time.

Best Publications

  • Comprehensive Clinical Assessment in Community Setting: Applicability of the MDS‐HC

    John N. Morris;Brant E. Fries;Knight Steel;Naoki Ikegami

  • Population ageing and wellbeing: lessons from Japan's long-term care insurance policy

    Nanako Tamiya;Haruko Noguchi;Akihiro Nishi;Michael R Reich

  • Japanese universal health coverage: Evolution, achievements, and challenges

    Naoki Ikegami;Byung Kwang Yoo;Byung Kwang Yoo;Hideki Hashimoto;Masatoshi Matsumoto

  • Estimating an EQ‐5D population value set: the case of Japan

    Aki Tsuchiya;Shunya Ikeda;Naoki Ikegami;Shuzo Nishimura

  • Long-Term Care Insurance Comes To Japan

    John Creighton Campbell;Naoki Ikegami

  • Moving towards universal health coverage: lessons from 11 country studies.

    Michael R Reich;Joseph Harris;Naoki Ikegami;Akiko Maeda

  • Nursing homes in 10 nations: a comparison between countries and settings

    Miel W. Ribbe;Gunnar Ljunggren;Knight Steel;Eva Topinková

  • Use of physical restraints and antipsychotic medications in nursing homes: a cross-national study.

    Zhanlian Feng;John P. Hirdes;John P. Hirdes;Trevor F. Smith;Harriet Finne-Soveri

  • Cost containment and quality of care in Japan: is there a trade-off?

    Hideki Hashimoto;Naoki Ikegami;Kenji Shibuya;Nobuyuki Izumida

  • Home Care Quality Indicators (HCQIs) Based on the MDS-HC

    John P. Hirdes;Brant E. Fries;John N. Morris;Naoki Ikegami

  • Lessons From Public Long-Term Care Insurance In Germany And Japan

    John Creighton Campbell;Naoki Ikegami;Mary Jo Gibson

  • The resident assessment instrument-mental health (RAI-MH): Inter-rater reliability and convergent validity

    John P. Hirdes;Trevor F. Smith;Terry Rabinowitz;Keita Yamauchi

  • Medical Care in Japan

    Naoki Ikegami;John C. Campbell

  • Prevalence of inappropriate medication using Beers criteria in Japanese long-term care facilities

    Satoko Niwata;Yukari Yamada;Yukari Yamada;Naoki Ikegami

  • Japan’s Health Care System: Containing Costs And Attempting Reform

    Naoki Ikegami;John Creighton Campbell

  • Future of Japan's system of good health at low cost with equity: beyond universal coverage

    Kenji Shibuya;Hideki Hashimoto;Naoki Ikegami;Akihiro Nishi;Akihiro Nishi

  • Health care reform in Japan: the virtues of muddling through.

    Naoki Ikegami;John Creighton Campbell

  • Measurement of HRQL using EQ-5D in patients with type 2 diabetes mellitus in Japan

    Hiroyuki Sakamaki;Shunya Ikeda;Naoki Ikegami;Yasuko Uchigata

  • The Art of Balance in Health Policy: Maintaining Japan's Low-Cost, Egalitarian System

    Susan Horton;John Creighton Campbell;Naoki Ikegami

  • Public Long-term Care Insurance in Japan

    Naoki Ikegami

  • The Art of Balance in Health Policy: Maintaining Japan's Low-Cost, Egalitarian System

    John Creighton Campbell;Naoki Ikegami

  • Japan: Universal Health Care at 50 years 3 Cost containment and quality of care in Japan: is there a trade-off ?

    Hideki Hashimoto;Naoki Ikegami;Kenji Shibuya;Nobuyuki Izumida

Frequent Co-Authors

John C. Campbell
John C. Campbell University of Michigan–Ann Arbor
Kenji Shibuya
Kenji Shibuya King's College London
Hideki Hashimoto
Hideki Hashimoto Chuo University
Shunichi Fukuhara
Shunichi Fukuhara Kyoto University
Michael Drummond
Michael Drummond University of York
Aki Tsuchiya
Aki Tsuchiya University of Sheffield
Vincent Mor
Vincent Mor Brown University
Roberto Bernabei
Roberto Bernabei Catholic University of the Sacred Heart
Ichiro Kawachi
Ichiro Kawachi Harvard University
Gerard F. Anderson
Gerard F. Anderson Johns Hopkins University

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