Health Insurance Exchanges (HIX) 2.0

Data to Measure Each State's Key Implementation Decisions


HIX 2.0 provides information on the variation in implementation of the Affordable Care Act across all 50 states and tracks each state’s key implementation decisions.


Issue Briefs:

HIX 2.0 issue briefs provide insight into what health insurance exchange features are most effective and what factors explain state variation.


These data were collected from primary sources such as statutes and other regulatory decisions, but also from official gubernatorial press releases and other reliable news sources to ensure that the quickly changing nature of exchange implementation is being addressed. Datasets will be posted regularly on this site as they are completed, and completed datasets will be updated, and in some cases combined, as implementation moves forward. The date the datasets were last updated will be specified on each dataset's webpage.

  • SHOP Participation Rules: Characteristics of each state’s small business health insurance exchange and how participation rules on the small business exchanges vary between states, as well as their relationship to the individual exchanges.
  • State Insurance Department: Characteristics of each state’s insurance department, insurance commissioner and governor.

Forthcoming Datasets:

  • Insurance Market Characteristics: Infrastructures and interplay between various health insurance markets, including the various exchanges.
  • Insurers' Marketshare 2010-2012: Data tracking the percentage of market share of the largest three insurance carriers and their enrollment numbers by state pre-ACA.  
  • Insurers' Marketshare 2014: Post-ACA: Data tracking the percentage of the 2014 market share of the largest six insurance carriers and their enrollment numbers by state.
    • Insurer's Marketshare May 2014
    • Insurer's Marketshare June 2014
    • Comparison of May & June 2014
  • Insurance Premiums 2010-2014: Compilation of the average premiums for the individual market and the percentage cost difference pre- and post- ACA in each state.
  • State Action on Insurance Market Reforms: Taken from a report published by the Commonwealth Fund, this dataset examines states’ actions on various ACA protections that went into effect January, 2014.
  • Dental Coverage on the Exchanges: Data relating to whether an exchange offers stand-alone dental plans, whether states offer adult dental at all, and relevant regulations. What is offered as part of these dental plans.
  • Financial Management and Operation of the Exchanges: Variation in budgets and oversight of those budgets between exchanges.
  • Insurance Market Characteristics:
    • Methods of Premium Collection: How premiums are collected (e.g., pharmacies, taxes, bills, online) and how collection is enforced. Grace periods. Reasons for nonpayment.
  • Qualified Health Plans:
    • Drug Cost-Sharing Regulations: Type of cost-sharing restrictions each state applies to drug prescription coverage.
    • Determination of Essential Health Benefits: Variation in amount and kind of EHBs offered in a state.
    • Essential Community Providers: Variation in amount and kind of ECPs offered in a state.
    • Qualified Health Plan Selection and Certification: Substantive content of plans, as well as the variation between plans within and among the states.
  • Private Exchanges: How exchanges not facilitated by state or federal government differ from or overlap with ACA-created exchanges.
    • Regulation of Plans Off the Exchanges:
  • Risk Adjustment Strategy: How states account for their exchange enrollees' health status and health spending.


About The Leonard Davis Institute of Health Economics

The HIX 2.0 project is funded by the Robert Wood Johnson Foundation and the Alfred P. Sloan Foundation. The Leonard Davis Institute of Health Economics (LDI) is the University of Pennsylvania’s center for research, policy analysis, and education on the medical, economic, and social issues that influence how health care is organized, financed, managed, and delivered. For more information, please visit  

The creation of the datasets is a work in progress, and we welcome your suggestions. If you have any questions regarding the HIX 2.0 datasets, please contact Gabbie Nirenburg at


A Note To Researchers

If you are using the HIX 2.0 dataset for research purposes, please be sure to include proper citation for the data. Suggested citations are provided on each dataset's webpage. 


Learn More About Our Work

Health Insurance Enrollment

Additional Resources

Real-Time Policy Analysis

Urban Institute Quick Strikes are a series of timely briefs that examine a variety of health insurance coverage issues in the United States.

Learn more

SHADAC State Health Access Data Assistance Center

SHADAC helps states to monitor rates of health insurance coverage and provides technical assistance.

Learn more

Monitoring & Tracking ACA Implementation

The Urban Institute's monitoring and tracking series analyzes trends across diverse states on key health reform implementation issues.

Learn more