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CMS Increases Public Access to Medicaid, CHIP Data

The Centers for Medicare & Medicaid Services (CMS) made public its Transformed Medicaid Statistical Information System (T-MSIS) data, a collection of data files related to Medicaid and the Children’s Health Insurance Program (CHIP).

The release is part of the agency’s MyHealthEData initiative and represents the first time the data are publicly available. CMS over the past several years has worked with states to improve the quality and timeliness of T-MSIS data.

The data release is intended to allow researchers to better understand key Medicaid and CHIP information, including on utilization and spending under Medicaid managed care. The data collection includes a variety of demographic, utilization, enrollment, and encounter information.

Researchers and stakeholders can access the T-MSIS data by submitting a request to the CMS Research Data Assistance Center, paying a fee, and signing a CMS data use agreement containing privacy and data security requirements.

Contact Senior Director of Policy Erin O’Malley at or 202.585.0127 with additional questions.


About the Author

Rachel Schwartz is a former policy associate at America's Essential Hospitals.

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