Long Islanders signing up for health insurance through the Affordable Care Act beginning Saturday may suffer sticker shock, with some monthly premiums reaching thousands of dollars and no sign of an agreement on extending federal subsidies in sight.

Open enrollment on the New York State Department of Health’s ACA marketplace begins Nov. 1 for new enrollees and Nov. 16 for renewals.

About 28,000 Long Islanders currently receive a federal tax credit to help pay for their insurance. A 2021 law increased the amount of government assistance, but those enhanced subsidies are set to expire Dec. 31. Small-business owners and employees and independent contractors are among those who have ACA insurance .

If the subsidies are not extended, “The choice people will be making is between health ins

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