The federal government is due to pay at least 20 contractors more than their original estimates for work on HealthCare.gov and the rollout of ObamaCare, according to an official review released Tuesday.
The Department of Health and Human Services inspector general (IG) found that federal contracts on the rollout exceeded $1.7 billion in value.
Seven companies are due to receive more than double their initial estimates, the IG report stated.
The IG review is perhaps the first to sketch the financial consequences of the technical problems that nearly killed HealthCare.gov and several other exchanges last fall.
The audit also reveals a who's who of Washington contractors that stood up the new insurance system and reaped significant sums for their work.
Companies like Booz Allen Hamilton, Deloitte, Lockheed Martin, Northrop Grumman and HP Enterprise Services all had some hand in creating the federal marketplace.
Other firms like CGI Federal, which led the implementation effort before being fired earlier this year, generated bills on various contracts exceeding $250 million as of February.
In one case, while a 2011 contract was estimated to be worth $93 million at its awarding, CGI Federal could ultimately receive more than $200 million for that agreement.
The IG study looked at 60 contracts related but not exclusive to the federal exchange using documents and accounting records through February.
The report promises to be the first in a series of post-mortems on the cost of ObamaCare's rollout.