there's some positive news for Iowa, at least; as noted by Cynthia Cox and reported on by Tony Leys of the Des Moines Register, Wellmark is joining the Iowa exchange next year:
Iowa’s dominant health insurer has agreed to start selling policies a year from now that qualify for Obamacare subsidies.
Wellmark Blue Cross & Blue Shield has not participated in the Affordable Care Act’s online health insurance marketplace, which launched in the fall of 2013. The main effect of the company’s decision was that moderate-income Iowans could not choose Wellmark insurance if they wanted to purchase policies that qualified for new federal subsidies to help pay premiums.
The dominant carrier on the individual market in Iowa is Wellmark BCBS, which had 137,000 enrollees (something like 75% of all the market) last year.
However, there were two important caveats to that: First, Wellmark isn't currently participating on the ACA exchange; all of those enrollees were off-exchange only. Secondly, at the time I had no idea how many of them were ACA-compliant and how many were "grandfathered" or "transitional" policies, which aren't ACA compliant and which, more significantly, aren't part of the same risk pool.