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Mini MAX - Medicaid Sample

Description

The first version of Mini-MAX is now available. Mini-MAX is a five percent cross-sectional national sample of the MAX files. The sample is stratified by 51 states and by basis of eligibility (aged, disabled, children, and adults) among full beneficiaries and separately for restricted beneficiaries. We oversampled smaller states and smaller subpopulations to increase the precision of their estimates. We removed variables that were less commonly used, redundant, or unreliable to reduce the file size. By reducing the volume of the data, we hope to expand the community of individuals capable of conducting Medicaid research.

Due to issues with the availability of the Social Security Administration (SSA) Death Master File (DMF), the Centers for Medicare and Medicaid Services (CMS) removed the SSA Date of Death from external Medicaid Analytic eXtract (MAX) files (1999-forward) in April 2014. Date of death is still reported in the Mini MAX Personal Summary (PS) file using the Medicaid Statistical Information System (MSIS) Date of Death and Medicare Enrollment Database (EDB) Date of Death. Researchers interested in receiving death record information from state vital statistics offices should contact the National Center for Health Statistics (NCHS) to learn about the National Death Index.

Reports and Issue Briefs

  • “Mini-MAX Feasibility Study” - While MAX data are a critical Medicaid research tool that is widely used by the research community, the size and complexity of the MAX files have limited their use for some members of the research community, especially those with limited computing capacity. To facilitate wider use of MAX, CMS contracted with Mathematica to convene a technical expert panel (TEP) and determine the feasibility of creating a sample file for MAX. This report describes the feasibility analysis and recommends the development of a “Mini-MAX” sample. The report is available in the “Downloads” section below at "Mini-MAX Feasibility Study Final Report".
  • “Mini-MAX User Guide” - Because Medicaid data can be challenging to understand and use we created this user’s guide.  A primary goal of Mini-MAX is to expand the community of researchers using Medicaid data, this user’s guide should support this community’s needs by providing background information on the Medicaid program, highlighting important features of the Mini-MAX files, and providing guidance to researchers about issues to be considered when conducting research with Mini-MAX. The Appendices identify data elements in MAX that have been excluded from Mini-MAX, present references for supplemental resources, display summary statistics from MAX, and provide sample code for common tasks in a Mini-MAX analysis. The User’s Guide is available below in the “Downloads” section at “Mini-MAX User’s Guide”.
  • “Utilization of Dental Services among Medicaid Enrolled Children.” This issue brief includes an estimate of current rates of utilization for dental services among Medicaid-enrolled children in nine states and then evaluates how a child’s personal and community characteristics impact the likelihood that they utilize dental services.  Please see the “Downloads” section below.
  • “Utilization of Well-Child Care among Medicaid Enrolled Children.” This issue brief includes an estimate of current rates of utilization for well-child care among Medicaid-enrolled children in nine states and then evaluates how a child’s personal and community characteristics impact the likelihood that they utilize well-child services. These issue briefs demonstrate the use of Mini-MAX (MAX sample data) for research and demonstrate that Mini-MAX can produce useful analyses for policy makers. Please see the “Downloads” section below.