Earlier this month, Wall Street was nervous that the big for-profit health insurers, which control access to medical care for most Americans–even those enrolled in Medicare and Medicaid–had paid more patient claims during the second quarter of this year than investors felt was appropriate.
Matt Stoller had a great article on the ACA and vertical integration. I'd be interested to see what you can add, since the topic is pretty complex.
OPT. uses hardball tactics to deny paying FSA claims.