The Supreme Court is set to rule on the constitutionality of the controversial health care law passed in 2010.

STORY HIGHLIGHTS

Washington (CNN) -- The Supreme Court in coming days will issue perhaps as many as four separate opinions on the constitutionality of the health care law.

The Patient Protection and Affordable Care Act (PPACA or ACA) was signed into law March 23, 2010, passed by a Democratic congressional majority and championed by President Barack Obama. It has about 2,700 pages and contains 450 some provisions.

Here are the four issues the high court tackled separately during oral arguments in late March. Those issues are expected to play key roles in the judges' final decisions.

The gateway issue: Anti-Injunction Act

Would those challenging the law be barred from making any legal or constitutional claims until the key provision -- the individual mandate -- goes into effect in 2014? The obscure Anti-Injunction Act, dating back 145 years, prevents asking for a refund on a tax until that tax has been collected and paid. Judges in two federal appeals courts have made that "threshold" argument, which would effectively stop the current legal fight in its tracks.

Citing that law might give the court-- particularly its conservative members -- a way out of deciding the explosive issue in an election year. The majority could decide that the political branches can best resolve the conflicts, at least for now, or that the matter can be handled after the November elections. It could potentially delay a decision on the constitutionality of the individual mandate for at least four years.

The key Issue: Individual mandate

This provision would require nearly all Americans to buy some form of health insurance beginning in 2014 or face financial penalties. May the federal government, under the Constitution's Commerce Clause, regulate economic "inactivity?" Three federal appeals courts have found the PPACA to be constitutional, while another has said it is not, labeling it "breathtaking in its expansive scope." That "circuit split" all but assured the Supreme Court would step in to decide the matter.

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Health care's big four issues