Medicaid and CHIP enrollment
Monthly state-reported counts of people enrolled in Medicaid and the Children's Health Insurance Program, from the CMS Performance Indicator dataset.
Publisher
- Organization
- Centers for Medicare and Medicaid Services
- Publisher’s dataset
- State Medicaid and CHIP Applications, Eligibility Determinations, and Enrollment Data
- File or API used
- https://download.medicaid.gov/data/pi-dataset-august-2026-release.csv
- Retrieval script
scripts/fetch-cms-medicaid-chip-enrollment.py- Methodology
- https://data.medicaid.gov/api/1/metastore/schemas/data-dictionary/items/7d80cfd8-3266-4c55-8436-948b7c55b9dd
Coverage
- Geography
- States and the District of Columbia
- Time coverage
- 2013-09 to 2026-05
- Update frequency
- Monthly
- Published
- August 28, 2026
- Retrieved
- September 9, 2026
- License of the records
- Public domain. U.S. federal government work.
- Rows
- 16,573 observations, 2013-2026
Measures
| Measure | What it measures | Unit |
|---|---|---|
| Medicaid and CHIP enrollment | Point-in-time count of individuals enrolled in Medicaid or CHIP as of the last day of the reporting month, comprehensive-benefit enrollees only. | people |
| Medicaid enrollment | Point-in-time count of individuals enrolled in Medicaid as of the last day of the reporting month, comprehensive-benefit enrollees only. | people |
| CHIP enrollment | Point-in-time count of individuals enrolled in CHIP, including separate CHIP and Medicaid-expansion CHIP, as of the last day of the reporting month, comprehensive-benefit enrollees only. | people |
Caveats
- State-reported data, not an independently audited count; Medicaid-only and CHIP-only breakouts begin June 2017 for some states, though the combined total goes back to September 2013.
- Each month is first published preliminary, then revised to final; this dataset stores the final figure once CMS has one.
- CHIP enrollment includes separate CHIP and Medicaid-expansion CHIP, and in some states extends to adults, not only children.
- The source file has no United States total row; none is computed here.
- A note on an observation quotes the source's own footnote for that figure, such as retroactive enrollments or a non-point-in-time count.
Pages built on this dataset
How to cite
Understand Idaho, “State Medicaid and CHIP Applications, Eligibility Determinations, and Enrollment Data”, compiled from Centers for Medicare and Medicaid Services, State Medicaid and CHIP Applications, Eligibility Determinations, and Enrollment Data. Retrieved September 9, 2026. https://understandidaho.com/data/cms-medicaid-chip-enrollment/.
Cite Centers for Medicare and Medicaid Services directly for the figures themselves.
This page was last updated .