White House press secretary Jay Carney (REUTERS/Kevin Lamarque) White House press secretary Jay Carney (Kevin Lamarque/Reuters)

White House press secretary Jay Carney confirmed Monday that one in five Americans will not be able to sign up for insurance through  HealthCare.gov even if the administration meets its Nov. 30 deadline for fixing the online enrollment system.

The Washington Post first reported the administration's internal target Sunday.

"I think the way to look at that figure is that of, say, 10 who go on the system, roughly two won't get through the system," Carney said.

The 20 percent of users who wouldn't be able to enroll fall into three different categories, Carney said: "those who experience technical difficulties," those who aren't comfortable using a computer and those who have complex family situations.

When asked whether this 80 percent performance target represents what administration officials have been referring to as the "vast majority of users," Carney replied. "Others can decide whether or not 80 percent is a vast majority. I think in most contexts, it is."