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Aetna's CEO gave a harshly critical review Monday of the federal government's Obamacare marketplace, saying, "There's so much wrong, you just don't know what's broken until you get a lot more of it fixed."
Asked on CNBC's "Squawk Box" if he knew that the rollout of Healthcare.gov would be problematic, the insurer's CEO, Mark Bertolini, said his giant company's role as an alpha tester for the system gave it a sense of how many problems the health insurance marketplace faced on the eve of its launch.
"We were pretty nervous as we got further along," Bertolini said. "As they started missing deadlines, we were pretty convinced it was going to be a difficult launch."
(Read more: Rx for Obamacare? Feds mull rebuilding website)
His fears have been realized, he said, and the technological debacle seen at Healthcare.gov is one similar to just the handful he's witnessed in his career.
"It's nothing you ever like to repeat," Bertolini said. "Because it's very difficult. I've been there. It's career-ending in a lot of cases."
'On the fly'
"It's all been on the fly," Bertolini said of the construction of the marketplace and the integration of insurers such as Aetna, whose plans are being offered to up 40 million customers.
"We didn't get code drops until the last month before the system went live," he said.
Healthcare.gov was besieged by visitors went it went live Oct. 1 and has struggled to deal with a raft of software problems, including transmitting data to insurers and even allowing people to shop for plans.
(Read more: Obamacare overhaul)
It is not clear how many—or how few—people have even enrolled in plans sold on the site.
Asked how long the marketplace, also known as an exchange, will take to fix, Bertolini said, "That's the big question."
"I think the bigger issue is, will enough people sign up to make it work?" said Bertolini. Aetna, like other insurers, is counting on enough young and healthy people enrolling in the plans to offset the costs that come from providing benefits to older, sicker Americans.
"I think the attention span of the younger generation in using technology is that if it doesn't work the first time, it's going to be pretty hard to get them back the second time," he said. "If the program blows up because people don't sign up, then the program's not going to move ahead ... all that well."
Open enrollment in the Obamacare policies closes March 31. Bertolini said he didn't know if that was enough time to correct the system's problems.
'I would have' delayed
Asked if he would have delayed the launch of the exchange given its earlier problems, Bertolini said, "I would have, if I'd been in their seat." But, he added, "the politics got in the way of a good business decision."
(Read more: Obamacare delays)
However, Bertolini also said, "it's the law of the land, number one. Number two, public exchanges are going to be here to stay, so we need to make them work somehow. ... The question is: How do we get from here to there?"
He said it could take three years or so before the marketplace's problems are fully sorted out.
—By CNBC's Dan Mangan. Follow him on Twitter @_DanMangan