Statewide totals as well as drill-down detail are available.
NET 4.5 MVC 5 web application that utilizes Backload 2.0 to help with uploading an Excel file.
The controller method works great in my development environment. Backload.config like described here: https://github.com/blackcity/backload/wiki/Example-12 The demo package also includes an events example: https://github.com/blackcity/Backload/releases/download/v220.127.116.11/Backload.
Commercial enrollment consists of small group, large group, and individual enrollment.
This set of resources — California Health Insurers, Enrollment: Quick Reference Guide, 2018 (PDF) and California Health Insurers Enrollment Database (ZIP) (published 2018) — combines enrollment data from California’s two health insurance regulators, the Department of Managed Health Care (DMHC) and the California Department of Insurance (CDI).
I am creating a large dataset of time series data to use in prototyping, so that I can get several thousand data points.