WASHINGTON — With just days left to enroll, fewer people are signing up for the Affordable Care Act, even though premiums are stable, more plans are available and millions of uninsured people can still get financial help.

Barring an enrollment surge, the nation’s uninsured rate could edge up again after a yearslong coverage expansion that has seen about 20 million people obtain health insurance.

A status report Wednesday from the Centers for Medicare and Medicaid Services showed nearly 20 percent fewer new people signed up than at about the same time last year. New sign-ups drive the growth of the HealthCare.gov marketplaces, helping keep premiums in check.

The sign-up deadline in most states is this Saturday, for coverage beginning Jan. 1. A few states that run their own health care websites have later deadlines.

Disappointing sign-ups will add to the long-running political blame game over health care. Democrats accuse the Trump administration of “sabotage” on the health law. Republicans counter that pricey Obama-law premiums are too high.

Last year about 11.8 million people signed up for subsidized private health insurance during the ACA’s open enrollment period.