Mathematica's evaluation of Medicaid Section 1115 waiver demonstrations, approximately 40 in number, seeks to assess the implementation and outcomes of four different types of innovations and help CMCS shift toward data-driven decision making for future waiver approvals.
- Data analytics and measure development
- Health care financing and insurance
- Program and policy evaluation
- Medicaid and Medicare enrollment and claims data
- Medicaid and CHIP
- Mental Health and Substance Use
- State Health Policy
- Delivery System Reforms
- Employment and Income Support
Su Liu’s research focuses on access, cost, and quality issues for programs that serve vulnerable populations, such as people with low income, the elderly, people with disabilities, and the uninsured in the United States.
Since joining Mathematica in 2003, Liu has played key roles in state- and federally funded projects, including an evaluation of the Medicaid 1115 demonstration, development of data analytics for Medicaid and Children’s Health Insurance Program (CHIP) Business Information Solutions, risk adjustment for quality measure development, and technical assistance for states’ coverage expansion initiatives and spending projections. She recently directed a project to help the Financial Management Group at the Center for Medicaid and CHIP Services (CMCS) collect, review, and analyze data from states; this project was part of a Medicaid oversight effort related to upper-payment-limit demonstrations and supplemental provider payment.
Several of Liu’s current projects involve data quality assessment and construction of program monitoring measures using the Transformed Medicaid Statistical Information System Analytic File. Past projects include Mathematica’s large-scale evaluation of the Ticket to Work initiatives and the Medicaid Buy-In program.
Liu has published work in peer-reviewed journals such as Inquiry, Health Policy and Planning, and Journal of Disability Policy Studies. She has presented at professional conferences sponsored by AcademyHealth, the American Public Health Association, and the International Health Economics Association. Before rejoining Mathematica in 2015, Liu was also a faculty member at the School of Public Health and Primary Care at the Chinese University of Hong Kong and a visiting scholar at the University of Oxford’s Health Economics Research Centre. She has a Ph.D. in economics from the University of California, Irvine.
New Approaches for Medicaid: The 1115 Demonstration Evaluation
Medicaid Buy-In Program
The Medicaid Buy-In program allows adults with disabilities to earn more than would otherwise be possible and still have Medicaid coverage. In return, participants “buy into” the Medicaid program, typically by paying premiums based on income. To assist CMS in monitoring the program, Mathematica has developed...