I've been trying to put this link into a few threads to correct people who are confusing the CMS database with VAERS for the 45K deaths.

The CMS is part of an FDA active surveillance system of the COVID vaccines called BEST. It's a monster project, with data coming in from all types of sources. The data results have not been made public by the FDA, and I know at least some of the sources cannot be FOIA'd. Here is a link to a .ppt presentation about the system.

https://www.fda.gov/media/143557/download

It's also important to note that Medicare and Medicaid data are primarily for billing purposes and can be slow to come in. Also, it's unclear whether just Medicare or Medicaid was used for the query. Medicaid data would have to pass through the states' data systems first before going to the Feds, so I'm assuming this may be just Medicare.