Relevant excerpt if you (like me) are unclear on what this is about:

The group also pointed to Medicare Advantage as “one of the ripest sources for profit for insurers,” noting that the privately run plans “delay and deny necessary care to seniors,” “limit access to care,” and overbill the federal government by making patients appear sicker than they are.

“All of these practices require the creation of significant oversight mechanisms by relevant agencies, which struggle to keep up with the innovations in grift that Medicare Advantage plans undertake year after year,” Public Citizen’s letter states.