CMS periodically updates pathways and webpages for its provider data files. On February 3, 2022, CMS announced they had updated a lot of data files to CY2020. They have also migrated data from "CMS.gov/Research-statistics..." (a main tab on the CMS.gov home page) to CMS.data.gov, the new entry point.
See a home page for CMS program statistics here:
This enters you into 3 main fields of Medicare enrollment, providers, and utilization/payment. Generally, you get to links that pop you into Data.cms.gov where you get more granular choices.
There are still some important databases that are hard to find in a logical way and I usually get there by Google. The most important is the huge annual database with every physician (and lab) and every CPT code paid. It's here.