Obama subsidized (or tried to) insurance companies to keep them afloat until after his presidency. None of this works without taxpayer money.
BS! They should be "replaced" by NOTHING. The government should replace itself right out of the Insurance and the Health business along with big time tort reform, at least toward loser- or loser's attorney pays. Medical costs would come down drastically to be less than the costs of off-shore medicine. Insurance would shrink back to being actual insurance for large unexpected expenses and would be paid for with a tiny fraction of the current "premiums."
Another reform should be prevention of drug companies selling patent drugs at lower prices overseas and onerous trade sanctions against foreign companies and countries that clone those drugs. That will bring down the patent period prices a lot because the whole world will be participating in paying for the development costs of the new drugs rather than just the Americans paying all those costs in super high prices for development that benefits the whole world.