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Medicaid Statistical Information System (MSIS) State Summary Datamarts

Since the implementation of the Balanced Budget Act of 1997, States have been submitting eligibility and claims program data to CMS through the Medicaid Statistical Information System (MSIS).  The state-submitted data include over 65 million eligibility records and over 3 billion claims records per year including payment for long-term care services, drugs, inpatient hospital stays and all other types of services.  


The quarterly data cube includes summary information on Medicaid eligibility and utilization and contains the following dimensions:  State, period (quarterly or annual), age group, race, sex, MAS (maintenance assistance status), BOE (basis of eligibility), dual eligibility status, CHIP status, program type, plan type, service category, service type, claim type, and adjustment indicator.  The available measures are:  unique eligible count, unique beneficiary count, total claims count, total Medicaid paid amount, encounter total claims count, unique encounter beneficiaries count, unique enrollees, total days of care count, and IP discharge total count. 


The State Summary DataMart has been developed to extract pre-aggregated data from the granular tables for pre-determined dimensions and measures and display the aggregated statistics for analysis.  This mart was NOT developed to answer all research  questions, but CMS believes that the mart will provide much needed support to States and others who have a need to obtain State-specific and/or national data quickly and efficiently.

MSIS data definitions are available in the MSIS Data Dictionary.


The data is State reported and may contain some data errors not identified by the edit and data quality review processes. Review the data anomalies document to understand some of the idiosyncrasies of the overall and State-specific data. 

Last modified on: 9/29/2014 4:39 PM