MADISON (AP) — Gov. Scott Walker's health secretary says no decision has been made yet on whether Wisconsin will seek a voluntary expansion of Medicaid services as provided under the federal health care overhaul.

Dennis Smith said Wednesday that answer won't be revealed until Walker introduces his budget in February. The expansion is set to take place in 2014 unless states opt out.

Walker has been critical of the expansion in the past, raising concerns about how much it would cost the state. And Smith says, "Medicaid is unsustainable without reform. Without reform, states really can't expand."

Smith held the conference call the day before he was to testify before a House subcommittee about uncertainty surrounding the Medicaid expansion.