I have Obamacare's new Pre-existing Condition Insurance Plan (PCIP). It is really great!
I carried health insurance for all of my mostly self-employed life, but lost it after a screwup with the insurance company a few years ago. I then found I was entirely mensurable due to high blood pressure and thyroid problems (my whole family has them - lots of chemicals in our rural farm childhood!)
Those insurance companies are psychic - three months after I lost my insurance I ended up in the hospital with pneumonia and the first stage of congestive heart failure, in part caused by extreme arrhythmia. Over the next three years, I was hospitalized twice more, totaling $250,000, although other than tests and maintenance, nothing was done to actually fix my problem (a pacemaker) - it costs very little to keep someone in an existing ICU bed, but a pacemaker needs money.
While I could easily have gotten on Social security disability, you don't get Medicare until two years after you get the disability. I needed to come up with nearly $800/mo for medicines and tests each month for maintenance of my 20% ejection fraction heart and associated issues, and thus could not get SSD because you need to NOT make money!

A wonderful catch-22. I was on my way to being a stroked out charity case in a public facility.
PCIP insurance will cover you IMMEDIATELY for any condition, and the insurance only requires you to A: Not have had insurance for six months and B: be charged extra or unable to get insurance because of health reasons. It was an amazing application, with four questions (Are you a citizen? What is your age and address? Have you been turned down or charged extra because of a health condition?) It took a month, and then I had insurance in 11/10.
It is not a freebie, I pay $560/mo at age 59 (if you are 19-30, it is about $200/mo), and you have an annual deductible of $1500, but ONLY an out-of pocket of $2500 TOTAL each year! This includes advanced prescription coverage and the expensive stuff, with NO POLICY LIMIT!
It is (after the annual deductible) 100% covering my CPAP machine and equipment, my testosterone creme, my pacemaker (everything covered including my home monitoring machine), my $1000/mo (retail) in drugs, much more. It is a PPO, go to any doctor in the big network, no reference needed for specialists, it pays for prosthesis, and more.
If you or someone you know has a current or previous medical condition, and can find a way to pay the premium, they will be infinitely better off with PCIP instead of Medicaid, Medicare, or really any other policy I have had since my union days 30 years ago. I sold insurance for some years, and it is amazing.
Got to
http://www.pcip.ca.gov/Costs/ for California, or to
https://www.pcip.gov/ for other states (any state that is not doing their own PCIP the feds do it).
BTW, I got my pacemaker Mar 3, and my ejection fraction is now 35%, I am able to work well, and every part of my health is improving! And I can work longer and make more money! The $250,000 in pointless hospitalization was a wasted societal cost, a cost that is happening every day everywhere as sick people go to the ER to get quick care but not REAL medical care.