Roughly 16,000 Hawaii residents have yet to re-enroll in Obamacare plans and could lose coverage as of Jan. 1.

The Centers for Medicare & Medicaid Services, the U.S. agency in charge of Obamacare, announced Wednesday that 8,060 people in Hawaii signed up for coverage through the federal marketplace, healthcare.gov. The state estimates there are 24,000 residents currently on Obamacare plans.

The deadline to keep coverage active at the start of the new year was Dec. 15, but the feds extended the date until today.

Hawaii Health Connector consumers must re-enroll via the federal healthcare.gov program to avoid a lapse in coverage and tax penalties of $695 or more for being uninsured.

“The unprecedented demand over the last several days continues to show that coverage through healthcare.gov is something millions of Americans want and need,” said Sylvia Burwell, secretary for the U.S. Department of Health and Human Services, in a news release. “We urge those who left their names with the marketplace to come back to healthcare.gov or the call center and complete their application for coverage starting Jan. 1.”

More than 1.3 million Americans signed up for coverage through the federal marketplace between Dec. 6 and Dec. 12. The total number of plan selections made since the enrollment period began on Nov. 1 is 4.17 million, including about 1.5 million new consumers. Those who missed the deadline for Jan. 1 coverage, can still enroll in medical plans through the exchange up until Jan. 31, but their coverage would start sometime after Jan. 1.