World-leading Population Health Analytics Software
The Johns Hopkins ACG® System produces analytic insights to empower organizations to predict, prevent and manage population health challenges with smarter, data-driven action and measurable results.
The Johns Hopkins ACG System: Guiding a Proactive Approach to Population Health
Developed and continuously validated by experts at the Johns Hopkins Bloomberg School of Public Health, the ACG System is the world’s leading population health analytics toolkit that transforms how healthcare organizations understand, predict and manage their populations’ health needs. With more than 1,000 academic publications showcasing the power, science, insights and results produced by the software, the ACG System has earned global recognition as the preeminent population health solution.
To find more ACG System resources, including our blog, case studies and more, visit the Johns Hopkins ACG System website.
Core Features
Our proprietary Patient Need Groups (PNGs) categorize patients into 11 mutually exclusive and clinically relevant groups based on comprehensive health needs – beyond individual diseases – enabling targeted care strategies for every patient type.
Machine learning-powered models forecast health outcomes, predict costs and identify hospitalization risks up to 12 months ahead, allowing proactive intervention for rising-risk patients to improve outcomes and prevent high-cost cases.
Seamlessly combines clinical, claims, pharmacy, lab and social determinants data to create actionable insights that go far beyond traditional medical records.
GeoHealth and Social Need Markers identify geographic and social barriers to care, providing insights that are vital to improving outcomes for vulnerable populations.
Pinpoint actionable intervention opportunities – from substance misuse to frailty and care coordination challenges – that can prevent patients from progressing to higher-risk categories.
Use Cases
Who Uses the ACG System?
Health Systems & Provider Organizations
Segment and stratify your patient population with clinically meaningful Patient Need Groups (PNGs) that drive targeted care strategies. Identify rising-risk patients, optimize resource allocation and succeed in value-based care arrangements while improving outcomes across your entire patient base.
Data Analytics & IT Companies
Enhance your product offering with the ACG System’s proven methodology and globally validated analytics. The ACG System is ready to deploy and continuously maintained by Johns Hopkins experts, saving your teams significant time and resources. Differentiate your solution with Johns Hopkins-validated methodology while accelerating time-to-market for your clients.
Governments & Public Sector
Optimize population health management across single-payer health systems with internationally validated analytics. From England’s National Health Service to Australia’s Primary Health Networks, government organizations worldwide trust the ACG System for population case management, resource planning, case-mix adjustment and equitable allocation of resources at scale.
Health Insurance Plans
Streamline risk stratification, cost prediction and member utilization management with sophisticated analytics available to health plans through our U.S. distributor, SS&C Technologies. Improve underwriting accuracy and network adequacy to succeed in competitive insurance markets.
Learn More About the ACG System
Frequently Asked Questions
The ACG System is a comprehensive population health analytics software that uses structured clinical data to assess patient health needs, predict future health risks and guide resource allocation based on patterns of comorbidity. It helps organizations identify at-risk patients and manage care more effectively and efficiently to impact health outcomes.
The ACG System is used globally by health plans, health systems and other large provider organizations, health care IT/analytics companies, government health agencies, and academic institutions.
The ACG System considers a patient’s entire experience across primary, secondary and tertiary care settings over a 12-month observation period. Data may be sourced from claims or electronic medical record data. At a minimum, the ACG System requires: patient demographics (including a unique identifier), diagnosis data (ICD-10, SNOMED, ICPC), medications filled (NDC, ATC, dm+d), and procedure codes or activity data. Additional data input such as lab results (LOINC), social determinants of health (SDoH), and supplementary medical files can further enhance insights.
The ACG System was developed by Johns Hopkins clinicians and researchers and is based on nearly 40 years of published and evidence-based academic research. The ACG System takes a whole-person approach in its methodology — based in patterns of disease, as opposed to a single condition or event. The ACG System is clinically grounded and designed to support a wide range of use cases from population health management to predictive modeling and equity-focused interventions.
The system helps identify high-risk patients, rising-risk individuals and care gaps — enabling more targeted interventions. It supports case-mix adjustment and performance monitoring, resource planning, and risk stratification and segmentation to support strategic population health management decision-making.
Yes, the ACG System is designed to be flexible and the output can be integrated into your existing data warehouse, business intelligence tools or EHR systems.
Organizations using the ACG System have reported improved prioritization and triage of patients for care management programs, reduced hospital readmissions and Emergency Department visits, improved clinical health markers and more equitable resource allocation amongst provider practices. Case studies and peer-reviewed research are available upon request.
The ACG System is updated frequently to reflect the latest clinical codes, model improvements and emerging health care trends. We conduct regular mapping updates to account for new codes to be mapped to our risk markers and new product releases as needed based on new research and to meet evolving industry needs.
Yes. Johns Hopkins HealthCare Solutions offers onboarding, technical support and training, as well as consultation services for implementation and building out use cases tailored to individual customers’ needs.
Downloadable Resources
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