Republican leaders of the House Energy and Commerce Committee have asked America’s Health Insurance Plans and several major insurance companies to brief staffers by next week on reinsurance payments to insurers by the Centers for Medicare and Medicaid Services.

Reps. Fred Upton (R-Mich.), Tim Murphy (R-Pa.) and Joe Pitts (R-Pa.) wrote to Marilyn Tavenner, president and CEO of AHIP, as well as Aetna, Anthem, Blue Cross Blue Shield, Cigna, Humana and UnitedHealth Group asking for briefings by March 15. The request follows an announcement made last month by CMS that it would use funds from the Department of the Treasury to make reinsurance payments to insurers, and that violates federal law, they write.

The failures of a dozen non­profit health insurance plans created by the Affordable Care Act could cost the government up to $1.2 billion, according to a harsh new congressional report that concludes federal officials ignored early warnings about the plans’ fragility and moved in too late as problems arose.

The report, released Thursday by a Senate investigations panel, says that the bulk of those loans are unlikely to be recovered, with some plans unable to pay “a substantial amount of money” they still owe doctors and hospitals for members’ care.