The Affordable Care Act isn't perfect. Even proponents of the law would agree with that.

In many parts of the country, there is only one insurer in the individual markets — and in a few, there are zero. Premiums have spiked, sending some people on the insurance exchanges hunting for new plans.

If you listen to the news, you know all of this. Particularly in the past year or so, these complaints have been at the heart of Republicans' push for repealing the Affordable Care Act, also known as Obamacare. And as senators try to scrape together enough votes to pass their own health care overhaul, these are at the heart of their pitch to the American people.

NPR asked several health care experts to tell us what they view as the biggest problems with the current health care system. Then we asked: Does the Senate bill fix them? Most of the experts we consulted (backed up by a Congressional Budget Office assessment) said that for the most part, no — the Senate bill won't solve the health care system's problems and that it, in fact, could make some of those problems worse.

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