The Obama administration said on Tuesday that a midnight deadline for most people to finish health-insurance applications for private coverage this year wouldn't be extended amid signs that enrollment waits had dissipated.

Aaron Albright, a spokesman for the Centers for Medicare and Medicaid Services, confirmed there would be no further changes to an extension that pushed the end of insurance enrollment until April 15 for those who were "in line" on HealthCare.gov by March 31. The federally run site is the main portal for buying insurance under the Affordable Care Act.

People who are considered to have complex cases involving persistent technical problems can still qualify to enroll outside of the standard sign-up period, as will people who have changes in their circumstances that affects their insurance coverage, such as a job loss or a divorce.

A surge of last-minute applications ahead of the original March 31 enrollment deadline had severely strained the technical and human capacities of the sign-up system, including the HealthCare.gov website serving 36 states that declined to run their own insurance marketplaces. Most of the states running their own sites also offered extensions of varying lengths.

But on Tuesday, some enrollment centers that had long lines on the eve of the official deadline said that those had mostly cleared over the first two weeks of April.