Under intense pressure to curb costs that have led to losses on the Affordable Care Act exchanges, insurers are accelerating their move toward plans that offer limited choices of doctors and hospitals.

A new McKinsey & Co. analysis of regulatory filings for 18 states and the District of Columbia found that 75% of the offerings on their exchanges in 2017 will likely be health-maintenance organizations or a similar plan design known as an exclusive provider organization, or EPO. Both typically require consumers to use an often-narrow network of health-care providers—in some cases, just one large hospital system and its affiliated facilities and doctors.

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Massachusetts will be responsible for at least $162 million in new costs over the next decade to fund the federal expansion of health insurance coverage, according to a new report.

The paper from the Pioneer Institute, a free-market-oriented Boston think tank, said that additional spending will squeeze the state budget and divert money from other priorities such as education and transportation.

The costs come in the form of a fee that is part of the Affordable Care Act, which extended insurance coverage to millions of people. The law makes more Americans eligible for Medicaid and provides subsidies to many people on private insurance plans, depending on their level of income. Pioneer said it is the first organization to calculate the long-term costs of the fee.

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In the last few years, even though premiums in the Affordable Care Act’s health insurance marketplaces were rising, most customers could avoid a big price rise by shopping for a cheaper plan.

Next year, according to a preliminary analysis, that is going to be a lot harder.

Even someone who shopped wisely this year and is willing to switch plans to get the best deal next year is looking at an average premium increase of 11 percent, according to an analysis of rate filings in 18 states and the District of Columbia provided by the McKinsey Center for U.S. Health System Reform.

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Senate Majority Leader Mitch McConnell (R-Ky.) says major changes are coming for ObamaCare next year, no matter who wins the White House.

Pointing to rising costs and shaky insurance markets, McConnell said the next president will have to work with Congress to keep the situation from worsening, though he did not specifically say the healthcare law would be repealed.

“It will be revisited by the next president, whoever that is,” McConnell said at an event Monday with the Kentucky Chamber of Commerce. “No matter who wins the election, no matter who’s in control of Congress.”

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