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Save the date! ACG System User Conference October 26-28, 2025

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Employment of mid-level providers in primary care and control of diabetes

Prim Care Diabetes 5:25-31. Center for Health Services Research in Primary Care, Veterans Affairs Medical Center, Durham, NC, USA AIMS: Examine potential associations between inclusion […]

High-deductible insurance: two-year emergency department and hospital use

Am J Manag Care 17:e410-8. Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA, USA OBJECTIVES: To determine the […]

Evaluating patient adherence to antidepressant therapy among uninsured working adults diagnosed with major depression: results of the Texas Demonstration to Maintain Independence and Employment study

Adm Policy Ment Health 39:374-382. Addiction Research Institute, University of Texas at Austin, Austin, TX, USA This study examined antidepressant adherence and persistence among uninsured […]

Factors associated with 90-day death after emergency department discharge for atrial fibrillation

Ann Emerg Med 61:539-548.e1. Institute for Clinical Evaluative Sciences, Toronto, ON, Canada STUDY OBJECTIVE: More than 10% of patients treated in the emergency department (ED) […]

Physician assistants and nurse practitioners perform effective roles on teams caring for Medicare patients with diabetes

Health Aff 32:1942-1948. University of Wisconsin–Madison, WI, USA; University of Pittsburgh School of Pharmacy, Pittsburgh, PA, USA One approach to the patient-centered medical home, particularly […]

The influence of socio-economic status and multimorbidity patterns on healthcare costs: a six-year follow-up under a universal healthcare system

Int J Equity Health 12:69. Center of Comparative Effectiveness Research, National Center of Excellence for Clinical Trial and Research, National Taiwan University Hospital, Taipei City, […]

Spreading a medical home redesign: effects on emergency department use and hospital admissions

Ann Fam Med 11 Suppl 1:S19-S26. Group Health Physicians, Seattle, WA, USA PURPOSE: The patient-centered medical home (PCMH) is being rapidly deployed in many settings […]

High use of health services in patients with suboptimal asthma drug regimens: a population-based assessment in British Columbia, Canada

Pharmacoepidemiol Drug Saf 22:744-751. University of British Columbia, Vancouver, BC, Canada; BC Children’s Hospital, Vancouver, BC, Canada; Child and Family Research Institute, Vancouver, BC, Canada; […]

Impact of poorly controlled hypertension on healthcare resource utilization and cost

Am J Manag Care 7:389-398. MEDTAP International, Bethesda, MD, USA OBJECTIVE: To examine the relation between blood pressure (BP) control and utilization and cost of […]

Comparison of comorbidity classification methods for predicting outcomes in a population-based cohort of adults with human immunodeficiency virus infection

Ann Epidemiol 24:532-537. St. Michael’s Hospital, Toronto, ON, Canada; University of Toronto, Toronto, ON, Canada; Institute for Clinical Evaluative Sciences, Toronto, ON, Canada PURPOSE: We […]

Development of a predictive risk model for unplanned admissions in the Basque Country

Rev Esp Salud Publica 88:251-260. Published in Spanish. Centro de Salud de Astrabudua,.Osakidetza (Servicio Vasco de Salud), Erandio. Bizkaia, Spain; Instituto Vasco de Innovación Sanitaria. […]

Do some physician groups see sicker patients than others? Implications for primary care policy in Manitoba

Winnipeg, MB, Canada: Manitoba Centre for Health Policy. Manitoba Centre for Health Policy, Winnipeg, MB, Canada Canadian policy makers are considering a variety of new […]

Ontario MedsCheck annual pharmacy medication review service: a comparison between initial and well established implementation periods

International Conference for Pharmacoepidemiology (ICPE) – August, 2015 Boston, MA, USA. Background: A MedsCheck Annual (MCA) consultation is a government-funded, medication review service in Ontario, […]

Risks of hospitalizations and surgery in elderly-onset inflammatory bowel disease: a population based study

Gastroenterology 146:S-171. Background: The incidence of Crohn’s disease (CD) and ulcerative colitis (UC) in the elderly population is reported to be increasing. Comorbid diseases, which […]

Patient based patterns of morbidity, a 17 year follow-up on patient records in primary care in Sweden

BMC Health Serv Res 7:A13. Karolinska Institute, Stockholm, Sweden BACKGROUND: Longitudinal studies on clinical categories of patients in primary health care are rare, as are […]

Development and evaluation of the Johns Hopkins University risk adjustment models for Medicare+Choice plan payment

Final report to Centers for Medicare and Medicaid Services, US Department of Health and Human Services. Baltimore, MD, USA: Johns Hopkins University. Johns Hopkins University, […]

Characteristics of Maryland residents who obtain health insurance from the small and large group markets

Bethesda, MD, USA: Project Hope Center for Health Affairs. Project Hope, Bethesda, MD, USA This report contains findings from a project conducted by the Project […]

Developing re-insurance and carve-out risk adjusters for an under 65 population

Johns Hopkins University, Lewin Group. Prepared for Health Care Financing Administration. Fairfax, VA, USA: Lewin Group. Johns Hopkins University, Baltimore, MD, USA; Lewin Group, Fairfax, […]

The ambulatory case-mix development project

Project final report. Baltimore, MD, USA: Johns Hopkins University and Aetna Health Plans. Johns Hopkins University and Aetna Health Plans, USA As the US health […]

Analysis of Medicaid payments for American Indians and Alaska Natives

Baltimore, MD, USA: CMS Tribal Affairs Group.. CMS Tribal Affairs Group, Baltimore, MD, USA The Indian Health Service (IHS) is a discretionary federal program that […]

Quality, costs and the role of primary health care

Linkoping, Sweden: Linkoping University. Linkoping University, Linkoping, Sweden The general aim of this thesis is to describe and analyse the role of primary  care in […]

Adherence to prescription drugs and adverse health events for patients with hypertension

Los Angeles, CA, USA: University of California, Los Angeles (doctoral dissertation). University of California, Los Angeles, CA, USA Increased technology in the development of effective […]

Time to readmission among chronically ill community-resident beneficiaries: variations by geographic area and provider type

Baltimore, MD, USA: Centers for Medicare and Medicaid Services. Schneider Institute for Health Policy, Heller School for Social Policy and Management, Brandeis University, Waltham, MA, […]

Optimal primary care for elders: periodic health examination and interdisciplinary geriatric team care

Waltham, MA, USA: Brandeis University (doctoral dissertation). Brandeis University, Waltham, MA, USA Health care organizations must find creative ways to achieve cost-efficient, high-quality primary care […]

Ischemic heart disease (IHD) and related health care utilization in Metis in Manitoba

Winnipeg, MB, Canada: Manitoba Metis Federation. Department of Community Health Sciences, University of Manitoba, Winnipeg, MB, Canada; Health & Wellness Department, Manitoba Metis Federation, Winnipeg, […]

Evaluation of the implementation of advanced nursing competencies in the Basque health care system

J Nurs Ed Pract 3:23-29. Basque Institute for Healthcare Innovation, Sondika, Bizkaia, Spain In 2011 advanced competences in nursing were defined and pilot tested in […]

Developing new comorbidity indices for cancer populations using administrative data

Dunedin, New Zealand: University of Otago (doctoral dissertation). University of Otago, Dunedin, New Zealand BACKGROUND: Comorbidity has an important impact on cancer outcomes, but the […]

Using case finding and risk stratification: A key service component for personalised care and support planning

Using case finding and risk stratification: A key service component for personalised care and support planning This handbook describes current thinking and provides practitioner insights […]

Data Visualization and Patient Identification – Military

The Defense Health Agency (DHA) supports the delivery of integrated, affordable, and high-quality health services to Military Health System (MHS) beneficiaries and is responsible for […]

How Health Information Technology can Impact the Delivery of Health Care

Johns Hopkins Bloomberg School of Public Health How Health Information Technology can Impact the Delivery of Health Care Karen Kinder, PhD, MBA

Tuesday-Managing hospitalization risk-Sylvia and Lu

Johns Hopkins HealthCare Develop a Risk Prediction Model to Identify Diabetic Members at High Risk of Hospitalization Martha Sylvia and Yanyan Lu

Monday-Pilot Experiences-Zhang

University of Minnesota Chinese Health Insurance System and Pilot Study for Applying ACG System to Chinese Healthcare System Yi Zhang and Stephen T. Parente, Ph.D.

Monday-Advances in modeling risk-Lemke

Johns Hopkins ACG System ACG Predictive Model for Readmission Risk Klaus Lemke

The ACG system in Leicester

NHS ACGs in Leicestershire and Leicester city Mark Pierce

Medication Therapy Management

DST Health Solutions Medication Therapy Management Amy Salls, Director Population Health Strategy Diana R. Kesser, Director Care Management Strategy

Monday(C3)-Cluster Analysis: Conditions and Variables That Are the Best Predictors of High Cost Members-Bob Gladden and Cathy Meade

Cluster Analysis: Conditions and Variables That Are the Best Predictors of High Cost Members  —Bob Gladden and Cathy Meade, CareSource

Tuesday(C8)- Use of ACG within Benefit Informatics for employer health plan cost management-Bruns

 Use of ACG within Benefit Informatics for employer health plan cost management-Bruns Benefit Focus

THE INTEGRATION OF ACG WITH THE BUSINESS INTELLIGENCE SYSTEM OF A LOCAL HEALTH UNIT IN VENETO REGION, ITALY 

N. Alba1, C. Bovo1, R. Marchi1, R. Borin1, F. Avossa2, E. Schievano2, M. Saugo2, M.C. Corti3, E. Boscolo3, C. Abrams4, K. Kinder4, D. Mantoan3;  1Local […]

ICD-10: Kelsey Rauch, DST Health Solutions

ACG System DST Health Solutions The Impact of Transitioning Coding Systems on Risk Adjustment Kelsey Rauch

Various ACG System Applications

Amy Salls, Director of Population Health Strategy at DST Health Solutions, provides a summary on the commercialization process and the various populations, applications, and user needs that the ACG System helps in the United States. Learn More.

Population Segmentation Case Study – Payer

Johns Hopkins Healthcare (JHHC) develops and manages medical care contracts for close to 400,000 plan members. JHHC created a framework based on an adapted version of the National Academy of Medicine taxonomy, combined with ACG System output, to provide a more extensive set of risk categories in an effort to expand their care management programs to high-risk Medicare patients.

Relation between primary care physician supply and diabetes care and outcomes: a cross-sectional study

Background: Higher primary care physician supply is associated with lower mortality due to heart disease, cancer and stroke, but its relation to diabetes care and […]

Home Palliative Service Utilization and Care Trajectory Among Ontario Residents Dying on Chronic Dialysis

Background: Many patients who receive chronic hemodialysis have a limited life expectancy comparable to that of patients with metastatic cancer. However, patterns of home palliative […]

Association Between Wait Time for Transcatheter Aortic Valve Replacement and Early Postprocedural Outcomes

Abstract Background Rapid growth in transcatheter aortic valve replacement (TAVR) demand has translated to inadequate access, reflected by prolonged wait times. Increasing wait times are […]

Variation in Revascularization Practice and Outcomes in Asymptomatic Stable Ischemic Heart Disease

Abstract   Objectives The aims of this study were to assess variation in revascularization of asymptomatic patients with stable ischemic heart disease, identify the predictors of variation, and […]

Trends in Providing Out-of-Office, Urgent After-Hours, and On-Call Care in British Columbia

Abstract   PURPOSE Providing care in alternative (non-office) locations and outside office hours are important elements of access and comprehensiveness of primary care. We examined […]

Impact of Predialysis Psychosocial Conditions on Kidney Transplant Recipient Survival: Evidence Using Propensity Score Matching

Abstract Background: An increased number of end-stage renal disease patients suffer psychosocial conditions and may experience delayed access to transplantation due to listing restrictions. However, […]

Days spent at home in the last 6 months of life: a quality indicator of end of life care in patients with hematologic malignancies

Abstract Despite advances in the management of hematologic malignancies, a significant proportion of patients die of their disease. We used administrative databases in Ontario, Canada […]

Comparison of Cardiovascular Risk Factors and Outcomes Among Practicing Physicians vs the General Population in Ontario, Canada

Abstract IMPORTANCE Although cardiovascular disease is the leading cause of death in most developed countries, little is known about current physicians’ cardiovascular health and outcomes. […]

Overall mortality and causes of death in newly admitted nursing home residents

Abstract Background In spite of a rapidly ageing population, there is a lack of population-based data on mortality among nursing home residents in Southern Europe. […]

The measurement of multimorbidity.

Abstract Overview: The presence of multiple concurrent medical conditions (also known as multimorbidity) is now a common phenomenon, hence the importance of its measurement. Objective: […]

Medication use and its impact on high-cost health care users among older adults: protocol for the population-based matched cohort HiCOSTT study

Abstract Background Health interventions and policies for high-cost health care users (HCUs) who are older adults need to be informed by a better understanding of […]

Overall Health Care Cost During the Year Following Diagnosis of Colorectal Cancer Stratified by History of Colorectal Evaluative Procedures

Abstract Background The cost-effectiveness of colorectal screening has been modeled; however, the cost of health care following the diagnosis of colorectal cancer has not been […]

Association Between Switching to a High-Deductible Health Plan and Major Cardiovascular Outcomes

Abstract Objective To describe the association between enrollment in high-deductible health plans and the risk of major adverse cardiovascular outcomes. Design, Setting, and Participants This […]

Emergency department use in people who experience imprisonment in Ontario, Canada

Abstract Objectives The aims of this study were to describe emergency department (ED) utilization by people in provincial prison and on release, and to compare […]

Healthcare services use and costs for a cohort of high needs elderly diabetic patients

Abstract Background The worldwide prevalence of diabetes mellitus is increasing, which especially involves people aged >65 years. A recent study also found that almost 75% […]

Individual and social determinants of SARS-CoV-2 testing and positivity in Ontario, Canada: a population-wide study

ABSTRACT Background Optimizing the public health response to reduce the burden of COVID-19 necessitates characterizing population-level heterogeneity of risks for the disease. However, heterogeneity in […]

The influence of frailty on postoperative complications in geriatric patients receiving single-level lumbar fusion surgery

Abstract Purpose This study evaluates the influence of patient frailty status on postoperative complications in those receiving single-level lumbar fusion surgery. Methods The nationwide readmission […]

Medical use of cocaine and perioperative morbidity following sinonasal surgery—A population study

Abstract Background Topical cocaine is favoured by many surgeons for sinonasal surgery due to its superior vasoconstrictive and anesthetic properties. However, historical reports suggesting cocaine […]

Risk Factors and Outcomes of Early Hospital Readmission in Canadian Kidney Transplant Recipients: A PopulationBased Multi-Center Cohort Study

Abstract Background Early hospital readmissions (EHRs) occur commonly in kidney transplant recipients. Conflicting evidence exists regarding risk factors and outcomes of EHRs. Objective To determine […]

Understanding Deductible and Reimbursement Maximum:A Study of Rural China’s Tiered Medical System

Abstract A high-deductible coverage is shown to reduce inappropriate health care, while little is known about its effect on social welfare under a reimbursement limit. […]

Claims-based pharmacy markers for comprehensive medication management program case identification: Validation against concurrent and prospective healthcare costs and utilization

Abstract Background Three claims-based pharmacy markers (complex, costly and risky medications) were developed to help automatically identify patients for comprehensive medication management. Objective To evaluate […]

Estimating The Marginal Productivity Of Health Technology Adoption

Abstract Decisions to adopt health technologies rely, in part, on judgements about cost effectiveness. Cost effectiveness is commonly assessed against a willingness-to-pay threshold for health […]

Care Coordination Engagement Patterns in Long-Term Patients

Abstract OBJECTIVE: Health care networks are increasingly turning to programs that provide office-based care coordination to high-cost, high-need patients to control preventable health care costs. […]

ACG System White Paper

  THE JOHNS HOPKINS ACG® SYSTEM is a leading risk measurement methodology that was developed and continues to be tested and improved at the Bloomberg […]

Risk Stratification: Identifying Geriatric Frailty from EHR Unstructured Data

With providers engaging more with risk stratification tools, unstructured data and free text from Electronic Health Records (EHRs), a potential exists to more effectively identify […]

Care Density: A Social Network Approach to Claims Data

If optimizing quality of care, clinical outcomes and cost effectiveness is one of your priorities, ensuring your patient population receives comprehensive, coordinated care from their […]

Understanding Population Health

With the challenges facing our health and social care services and the need to develop new care models to achieve the triple aim of improving […]

Risk aversion and costs: a comparison of family physicians and general internists

J Fam Pract 49:12-17. Department of Family Medicine, University of Rochester, New York, NY, USA No abstract Comment in: Interspeciality differences in medical resource utilization. […]

Obstructive sleep apnea and incident diabetes

A historical cohort study. Am J Respir Crit Care Med 190:218-225. University of Toronto, Toronto, ON, Canada; Institute for Clinical Evaluative Sciences, Toronto, ON, Canada; […]

The pattern of urologic care among traumatic spinal cord injured patients

Can Urol Assoc J 8:E805. Institute for Clinical Evaluative Sciences, Toronto, ON, Canada INTRODUCTION: We assessed the urologic care patterns of traumatic spinal cord injury […]

Risk factors for reoperation and mortality after the operative treatment of tibial plateau fractures in Ontario, 1996-2009

J Orthop Trauma 29:182-188. University of Toronto, Toronto, ON, Canada; Institute for Clinical Evaluative Sciences, Toronto, ON, Canada OBJECTIVE: To define the rates and risk […]

Do different case-mix measures affect assessments of provider efficiency? Lessons from the Department of Veterans Affairs

J Ambul Care Manage 26:229-242. Center for Health Quality, Outcomes and Economic Research, Bedford VAMC, Bedford, MA, USA Although case-mix adjustment is critical for provider […]

Achieving weight loss and hypertension control among obese adults: a US multidisciplinary group practice observational study

Am J Hypertens University of Wisconsin School of Medicine and Public Health, Madison, WI, USA; Veterans Affairs Pittsburgh Healthcare System , Pittsburgh, PA, USA; University […]

Association between the patient-centered medical home and healthcare utilization

Am J Manag Care 21:378-386. Weill Cornell Medical College, New York, NY, USA OBJECTIVES: The patient-centered medical home (PCMH) model of primary care is being […]

Indication for pharmacological treatment is often lacking: a cross-sectional study on the quality of drug therapy among the elderly

BMC Geriatr 15:117. Lund University, Malmö, Sweden; Stanford University School of Medicine, Stanford, CA, USA; University of Southern Denmark, Odense C, Denmark BACKGROUND: Although the […]

Infliximab in ulcerative colitis: the impact of preoperative treatment on rates of colectomy and prescribing practices in the province of British Columbia, Canada

Dis Colon Rectum 57:83-90. University of British Columbia, Vancouver, BC, Canada BACKGROUND: Approximately 20% of patients with ulcerative colitis will require surgical treatment. Recent data […]

Effect of practice variation on resource utilization in infants hospitalized for viral lower respiratory illness.

Pediatrics 108:851-855. University of Virginia Children’s Medical Center, Charlottesville, Virginia, USA OBJECTIVE: Hospital care for children with viral lower respiratory illness (VLRI) is highly variable, […]

Benefits and pitfalls in applying the experience of prepaid group practices to the U.S. physician supply

Health Aff W4:73-75. Center for Health Workforce Studies, School of Public Health, University at Albany, State University of New York, Rensselaer, NY, USA The paper […]

Does a diagnosis of schizophrenia reduce rates of mammography screening? A Manitoba population-based study

Schizophr Res 113:95-100. Department of Psychiatry, University of Manitoba, CancerCare Manitoba, Winnipeg, MB, Canada It is estimated that mammography screening can reduce mortality from breast […]

Using multiple data features improved the validity of osteoporosis case ascertainment from administrative databases.

J Clin Epidemiol 61:1250-1260. Manitoba Centre for Health Policy, University of Manitoba, Winnipeg, MB, Canada OBJECTIVES: The aim was to construct and validate algorithms for […]

Risk adjustment in health insurance exchanges for individuals with mental illness

Am J Psychiatry 169:704-709. Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA OBJECTIVE: In 2014, an estimated […]

Prevalence of health problems and primary care physicians’ specialty referral decisions

J Fam Pract 50:427-432. Health Services Research and Development Center, Department of Health Policy and Management, Johns Hopkins School of Hygiene and Public Health, Baltimore, […]

Early dropout from psychotherapy for depression with group- and network-model therapists

Adm Policy Ment Health 39:440-447. Group Health Research Institute, Seattle, WA, USA Administrative data were used to examine early dropout among 16,451 health plan members […]

Using the Johns Hopkins Aggregated Diagnosis Groups (ADGs) to predict mortality in a population-based cohort of adults with schizophrenia in Ontario, Canada

Psychiatry Res 196:32-37. Institute for Clinical Evaluative Sciences, University of Toronto, Toronto, ON, Canad Administrative health care databases are increasingly used for health services and […]

Multimorbidity patterns in primary care: interactions among chronic diseases using factor analysis

PLoS One 7:e32190. IIS Aragón, Aragón Health Sciences Institute, Miguel Servet University Hospital, University of Zaragoza, Zaragoza, Spain OBJECTIVES: The primary objective of this study […]

The effect of capitation on switching primary care physicians

Health Serv Res 38:191-209. University of Rochester School of Medicine and Dentistry, Department of Community and Preventive Medicine, Rochester, NY, USA OBJECTIVE: To examine the […]

How well do Ambulatory Care Groups predict expenditures on mental health and substance abuse patients?

Adm Policy Ment Health 24:339-357. Department of Health Care Policy, Harvard Medical School, Boston, MA, USA This paper evaluates the ability of Ambulatory Care Groups […]

Stratification of the population in the Basque Country: results in the first year of implementation

Aten Primaria 45:54-60. Published in Spanish. Instituto Vasco de Innovación Sanitaria, Sondika, Bizkaia, Spain Predictive models allow populations to be stratified according to their health […]

Triumph of hope over experience: learning from interventions to reduce avoidable hospital admissions identified through an Academic Health and Social Care Network

BMC Health Serv Res 12:153. Department of Health Care Management and Policy, University of Surrey, Guildford, UK BACKGROUND: Internationally health services are facing increasing demands […]

Comorbidity-based payment methodology for Medicaid enrollees with HIV/AIDS

Health Care Financ Rev 23:53-68. Center for Health Program Development and Management, University of Maryland Baltimore County, Baltimore, MD, USA Managed care organizations (MCOs) may […]

Monitoring the prevalence of chronic conditions: which data should we use?

BMC Health Serv Res 12:365. Osakidetza, Basque Health Service, C/ Alava n° 45, Vitoria-Gazteiz, Spain BACKGROUND: Chronic diseases are an increasing threat to people’s health […]

Effect of patient socioeconomic status on physician profiles for prevention, disease management, and diagnostic testing costs

Med Care 40:717-724. Department of Family and Community Medicine, University of California School of Medicine, Davis, CA, USA BACKGROUND: Previous research shows patient socioeconomic status […]

Medical and pharmacy expenditures after implementation of a cyclooxygenase-2 inhibitor prior authorization program

Pharmacotherapy 25:924-934. Medical and Pharmacy Integration Services, Prime Therapeutics, LLC, Eagan, MN, USA STUDY OBJECTIVE: To evaluate the effects of a cyclooxygenase (COX)-2 inhibitor prior […]

The MMPI-2: a contemporary normative study of midwestern family medicine outpatients

J Clin Psychol Med Settings 15:98-119. Department of Psychiatry and Psychology, Mayo Clinic, Rochester, MN, USA For more than 60 years it has been known […]

Relationships between physical activity and perceived qualities of life in old age

Results of the SNAC study. Aging Ment Health 13:1-8. School of Social Science, Vaxjo University, Vaxjo, Sweden OBJECTIVES: The aim of the present study was […]

Impact of morbidity, resource use and costs on maintenance of remission of major depression in Spain: a longitudinal study in a population setting

Gac Sanit 24:13-19. Published in Spanish. Dirección de Planificación, Badalona Serveis Assistencials S.A., Badalona, Barcelona, Spain OBJECTIVE: To determinate the impact of comorbidity, resource use […]

A population-based study of the association between socioeconomic status and emergency department utilization in Ontario, Canada

Acad Emerg Med 18:836-843. Division of Emergency Medicine, Department of Medicine, Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada OBJECTIVES: The […]

Complementary and alternative medicine provider use and expenditures by cancer treatment phase

Am J Manag Care 14:326-334. Department of Health Services, School of Public Health and Community Medicine, University of Washington, Seattle, WA, USA OBJECTIVE: To assess […]

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