The Congressional Budget Office essentially didn’t account for the cost of the program when it evaluated the health care law, as the number-crunchers assumed that the payments between insurers and the federal government would cancel each other out.

Following the botched rollout of the health care law, which has threatened insurers with a risk pool that skews toward older enrollees, it’s increasingly less likely that the provision will remain budget-neutral.

But Republicans are doubtful that the CBO would attempt to re-score the risk corridor program anytime soon.

“My understanding is that the first bit of data that they’d need to do that is not available,” Griffin said in a phone interview.

Insurers won’t know the final composition of the risk pool until open enrollment on the health insurance exchanges ends on March 31.