In fact, while President Trump may insist that the law has been “essentially gutted,” the A.C.A. market appears to be more robust than ever, according to insurance executives and analysts. A few states are likely to see a steep spike in prices next year, but many are reporting much more modest increases. Insurers don’t appear to be abandoning markets altogether. In contrast to last year, regulators are not grappling with the prospect of so-called “bare” counties, where no carrier is willing to sell A.C.A. policies in a given area.

“The market is in a better position now than it has ever been since the exchanges have opened,” said Deep Banerjee, who follows insurers for S & P Global Ratings. The companies first began selling policies in the state exchanges, or marketplaces, five years ago. After years of losses, the insurers are now generally making money.

With roughly a third of states releasing information, the insurers’ rate requests vary widely, according to an analysis by the Kaiser Family Foundation. In Maryland, companies are seeking increases averaging 30 percent. A midlevel policy in Baltimore could cost $622 a month, roughly a third higher than the average of the other states reporting to date.