(Bloomberg) — A Supreme Court ruling this year stopping Obamacare subsidies in three-quarters of the country would place immediate pressure on governors who have kept the health law at arm's length.

The court heard arguments Wednesday in a case challenging insurance-premium subsidies in states that didn't build marketplaces under the Patient Protection and Affordable Care Act. The justices might not issue a decision until late June.

Only 16 states built the online and telephone services called exchanges; the rest use the federal healthcare.gov system. As many as 87 percent of Obamacare customers get the subsidies. A ruling that ends them in 34 states would dramatically raise insurance premiums for an estimated 7.5 million Americans.

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