Opting Out of Medicare
Providers who have opted out of the Medicare program cannot be employed by, or work with, groups who have members who have not opted out of the Medicare program. For more information about opting out of Medicare (also known as "private contracting"), read the CMS Medicare Benefit Policy Manual (PDF, 1.41 MB), Pub. 100-02, Chapter 15, Section 40 (in its entirety).
A list of eligible practitioners who have opted out of the Medicare program can be located on the CMS website.