Employers with more than 100 employees must offer insurance or pay a fine of $2,000 per worker by January 2015.
Retail trade associations and two large retailers appeal to the Supreme Court to rule on the Federal Reserve's debit interchange rule.
National Retail Federation and other groups attacked the amount of debit card interchange allowed.
Retail trade associations and firms call the Fed's debit interchange rule an issue of staggering importance.
A new Aité Group report says cash is more expensive for retailers than cards. Retailer groups disagree.
E-commerce merchant Mitch Goldstone filed the interchange antitrust lawsuit back in 2005.
Retailers displeased with U.S. District Court Judge John Gleeson's adjudicated settlement of litigation surrounding credit card interchange appealed his decision last week.
Some retailers appeal a settlement other retailers had reached with Visa, MasterCard and six major banks.
Credit unions wondering if the courts would make them change their debit card programs can rest easy for now.
Retail federation says without PINs, chip cards make little sense. Visa and MasterCard disagree.