So it looks like this is a snafu in the writing of the law.
Hill gets Obamacare fix – Politico (Aug. 2, 2013)
The Office of Personnel Management, under heavy pressure from Capitol Hill, will issue a ruling that says the government can continue to make a contribution to the health care premiums of members of Congress and their aides, according to several Hill sources.
The problem was rooted in the original text of the Affordable Care Act. Sen. Chuck Grassley (R-Iowa) inserted a provision which said members of Congress and their aides must be covered by plans “created” by the law or “offered through an exchange.” Until now, OPM had not said if the Federal Employee Health Benefits Program could contribute premium payments toward plans on the exchange. If payments stopped, lawmakers and aides would have faced thousands of dollars in additional premium payments each year. Under the old system, the government contributed nearly 75 percent of premium payments.
The delay mentioned in my previous post is regarding this. They are trying to ensure that their Fed Health Plan contributes to the costs.