Of course already realized illnesses can't be insured for - the correct price of a policy for a guaranteed event would be higher than the maximum potential payout, so no one would ever buy it.
I myself have a hereditary health issue that results in expenses which are largely known. Obviously, I cannot be insured against already realized costs, and so my health insurance policy (taken after the health issue was discovered) specifically excludes any treatment for the issue. This is as it should be.No. If you want public healthcare, create public healthcare. If you want a Woman Subsidy, create one and mail a check to everyone who qualifies. Propping up a public-private healthcare monster that has neither the benefits of private industry nor the benefits of comprehensive public healthcare is stupid. Incorporating subsidies into insurance that are, by definition, not insurance is stupid.