At least one Wisconsin health insurance company says it won't participate in the new federal insurance exchanges in development as part of the Affordable Care Act, and others are keeping their plans quiet.

A Milwaukee Journal Sentinel report stated that it's just one example of the uncertainty around the new law, which takes effect Jan. 1.

WPS Health Insurance said it won't sell plans on the new exchange because it's not clear how the law's changes will play out.

The law will require insurers to cover people with pre-existing conditions, and mandate better benefits. That could affect insurers' profitability.

Arise Health Plan in Green Bay and Marshfield Clinic affiliate Security Health will participate in the exchanges. UnitedHealthcare and Anthem Blue Cross and Blue Shield of Wisconsin aren't disclosing their plans.