HARRISBURG, Pa. - Gov. Tom Corbett is seeking federal approval for his plan to bring billions of federal Medicaid expansion dollars to Pennsylvania to extend health insurance to half-a-million working poor.

The Corbett administration said it submitted the plan Wednesday to the U.S. Centers for Medicare and Medicaid Services.

The administration issued a draft plan in December, but Public Welfare Secretary Beverly Mackereth says it's backing off demands that enrollees search for work and pay premiums instead of co-pays in the first year as a condition of getting coverage.

Corbett, a Republican, refuses to expand Medicaid, which he calls inefficient. Rather, he wants to use the Medicaid expansion dollars to subsidize private insurance for newly eligible adults.

Corbett's been criticized for not moving to draw down Medicaid expansion dollars when they became available Jan. 1.