Andrew M. Ryan

9.3k citations

237 papers · 7.0k · 1 hit paper · h-index 42

Impact in

General Health Professions top 0.5%
- Primary Care and Health Outcomes
- Patient Satisfaction in Healthcare
- Healthcare cost, quality, practices
Economics and Econometrics top 0.5%
- Healthcare Policy and Management
- Health Systems, Economic Evaluations, Quality of Life

Papers in

Economics and Econometrics 116
- Healthcare Policy and Management 112
- Health Systems, Economic Evaluations, Quality of Life 26
General Health Professions 89
- Primary Care and Health Outcomes 65
- Patient Satisfaction in Healthcare 25
- Healthcare cost, quality, practices 14
- Global Health Care Issues 13

Co-authors: Justin Brigham Dimick (40 shared papers)Gilbert C. Gee (4 shared papers)Jyothi R. Thumma (17 shared papers)James F Burgess (4 shared papers)Tim Doran (10 shared papers)Lauren Hersch Nicholas (3 shared papers)Lawrence Peter Casalino (13 shared papers)David J. Laflamme (1 shared paper)
Journals: Health Affairs (33 papers)Health Services Research (24 papers)JAMA (14 papers)Annals of Surgery (14 papers)Journal of General Internal Medicine (8 papers)
Partner nations: United States United Kingdom Australia

In The Last Decade

Andrew M. Ryan

226 papers receiving 6.8k citations

Andrew M. Ryan's Hit Papers

align trajectories log scale

Methods for Evaluating Changes in Health Care Policy 2014 · 953 citations

What are hit papers?

Paper score: A paper's citations measured against the top-1% bar of its own field and year: the square root of citations ÷ bar, so 1 means right at the bar and 2 means four times its citations. The bar blends the citation counts that enter the top 1% of the paper's subfields in its year (weighted 89.5%), of those subfields over all years (0.5%) and of its year across all fields (10%); a subfield and year with fewer than 400 papers takes its year's bar. Papers from 2026 are not scored yet: in an unfinished year, when a paper appeared matters more than how it is cited.

Hit paper: A paper cited at least 1.5× the top-1% bar of its field and year: a paper score of at least √1.5.

2014 JAMA

Peers

Countries citing papers authored by Andrew M. Ryan

Since Specialization

Citations

This map shows the geographic impact of Andrew M. Ryan's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Andrew M. Ryan with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Andrew M. Ryan more than expected).

Fields of papers citing papers by Andrew M. Ryan

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Andrew M. Ryan. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Andrew M. Ryan. The network helps show where Andrew M. Ryan may publish in the future.

Co-authors

The 25 scholars most cited alongside Andrew M. Ryan, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with Andrew M. Ryan Line = papers co-authored together Andrew M. Ryan links everyone, so they are left out of the graph.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Showing the 20 most-cited of 237 papers — load more, or switch the sort, to bring in the rest.

#	Work
1	Methods for Evaluating Changes in Health Care Policy JAMA ·Justin Brigham Dimick, Andrew M. Ryan Hit paper breakdown →	2014	953
2	Self-Reported Discrimination and Mental Health Status Among African Descendants, Mexican Americans, and Other Latinos in the New Hampshire REACH 2010 Initiative: The Added Dimension of Immigration American Journal of Public Health ·Gilbert C. Gee, Andrew M. Ryan, David J. Laflamme, Jeanie Holt	2006	307
3	Association of Hospital Participation in a Quality Reporting Program With Surgical Outcomes and Expenditures for Medicare Beneficiaries JAMA ·Nicholas Harold Osborne, Lauren Hersch Nicholas, Andrew M. Ryan, Jyothi R. Thumma, Justin Brigham Dimick	2015	275
4	Why We Should Not Be Indifferent to Specification Choices for Difference‐in‐Differences Health Services Research ·Andrew M. Ryan, James F Burgess, Justin B. Dimick	2014	249
5	Bariatric Surgery Complications Before vs After Implementation of a National Policy Restricting Coverage to Centers of Excellence JAMA ·Justin Brigham Dimick, Lauren Hersch Nicholas, Andrew M. Ryan, Jyothi R. Thumma, John D. Birkmeyer	2013	162
6	Current State of Value-Based Purchasing Programs Circulation ·Tingyin T. Chee, Andrew M. Ryan, JASON H. WASFY, William B. Borden	2016	137
7	The Association between Self-Reported Discrimination, Physical Health and Blood Pressure: Findings from African Americans, Black Immigrants, and Latino Immigrants in New Hampshire Journal of Health Care for the Poor and Underserved ·Andrew M. Ryan, Gilbert C. Gee, David F Laflamme	2006	132
8	Association of Coded Severity With Readmission Reduction After the Hospital Readmissions Reduction Program JAMA Internal Medicine ·Andrew M. Ibrahim, Justin Brigham Dimick, Shashank S. Sinha, John M. Hollingsworth, Ushapoorna Nuliyalu, Andrew M. Ryan	2017	126
9	Use of Telehealth by Surgical Specialties During the COVID-19 Pandemic JAMA Surgery ·Grace Faith Chao, Kathleen Yinran Li, Ziwei Zhu, Jeff McCullough, Jake Claflin, Maximilian Fliegner, Emma Steppe, Andrew M. Ryan	2021	121
10	Effects of the Premier Hospital Quality Incentive Demonstration on Medicare Patient Mortality and Cost Health Services Research ·Andrew M. Ryan	2009	110
11	Changes in Hospital Quality Associated with Hospital Value-Based Purchasing New England Journal of Medicine ·Andrew M. Ryan, Sam Krinsky, Kristin A. Maurer, Justin Brigham Dimick	2017	109
12	Association of Intensive Care Unit Admission With Mortality Among Older Patients With Pneumonia JAMA ·Thomas S. Valley, Michael W. Sjoding, Andrew M. Ryan, Theodore John Iwashyna, Colin R. Cooke	2015	106
13	Long-term evidence for the effect of pay-for-performance in primary care on mortality in the UK: a population study The Lancet ·Andrew M. Ryan, Sam Krinsky, Evangelos Kontopantelis, Tim Doran	2016	106
14	Estimating causal effects for multivalued treatments: a comparison of approaches Statistics in Medicine ·Ariel Linden, Selver Derya Uysal, Andrew M. Ryan, John Adams	2015	101
15	Vertical Integration of Hospitals and Physicians: Economic Theory and Empirical Evidence on Spending and Quality Medical Care Research and Review ·Brady Post, Andrew M. Ryan +1 other	2017	95
16	Medicare’s Public Reporting Initiative On Hospital Quality Had Modest Or No Impact On Mortality From Three Key Conditions Health Affairs ·Andrew M. Ryan, Brahmajee K. Nallamothu, Justin Brigham Dimick	2012	93
17	Small Primary Care Physician Practices Have Low Rates Of Preventable Hospital Admissions Health Affairs ·Lawrence Peter Casalino, Michael F. Pesko, Andrew M. Ryan, Jayme L. Mendelsohn, Kennon R. Copeland, Patricia P. Ramsay, Xuming Sun, Diane R. Rittenhouse	2014	89
18	Will Value-Based Purchasing Increase Disparities in Care? New England Journal of Medicine ·Andrew M. Ryan	2013	86
19	Medicare’s New Bundled Payment For Joint Replacement May Penalize Hospitals That Treat Medically Complex Patients Health Affairs ·Chandy Ellimoottil, Andrew M. Ryan, Hechuan Hou, James M. Dupree, Brian R. Hallstrom, David Christopher Miller	2016	80
20	Variation in Physicians’ Electronic Health Record Documentation and Potential Patient Harm from That Variation Journal of General Internal Medicine ·Genna R. Cohen, Charles P. Friedman, Andrew M. Ryan, Caroline Regina Richardson, Julia Adler‐Milstein	2019	78

About Andrew M. Ryan

Andrew M. Ryan is a scholar working on Economics and Econometrics, General Health Professions, Emergency Medicine, Surgery and Cardiology and Cardiovascular Medicine, having authored 237 papers that have together received 7.0k indexed citations. Recurring topics across this work include Healthcare Policy and Management (112 papers), Primary Care and Health Outcomes (65 papers), Health Systems, Economic Evaluations, Quality of Life (26 papers), Patient Satisfaction in Healthcare (25 papers), Healthcare cost, quality, practices (14 papers), Global Health Care Issues (13 papers), Bariatric Surgery and Outcomes (12 papers) and Heart Failure Treatment and Management (9 papers). The work is most often cited by research in General Health Professions (1.8k citations), Economics and Econometrics (1.7k citations), Health Information Management (184 citations), Emergency Medicine (253 citations) and Health (194 citations). Andrew M. Ryan has collaborated with scholars based in United States, United Kingdom and Australia. Frequent co-authors include Justin Brigham Dimick, Gilbert C. Gee, Jyothi R. Thumma, James F Burgess, Tim Doran, Lauren Hersch Nicholas, Lawrence Peter Casalino, David J. Laflamme, Jan Blustein and Sam Krinsky. Their work appears in journals such as Health Affairs, Health Services Research, JAMA, Annals of Surgery and Journal of General Internal Medicine.

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

Explore authors with similar magnitude of impact

Andrew M. Ryan

Impact in

Papers in i

In The Last Decade

Andrew M. Ryan

Andrew M. Ryan's Hit Papers

Peers

Countries citing papers authored by Andrew M. Ryan

Fields of papers citing papers by Andrew M. Ryan

All Works

About Andrew M. Ryan

Explore authors with similar magnitude of impact

Papers in