DES MOINES, Iowa (AP) — The head of Iowa’s Medicaid program says she’s “very confident” the $4.2 billion system will be ready for private management on March 1, though some lawmakers expressed lingering concerns. Mikki Stier from the Iowa Department of Human Services told lawmakers Monday her confidence comes from more signups of Medicaid health providers and better communication to Medicaid recipients about the switch.

The state’s Medicaid program provides care to some low-income people, children and disabled individuals. Three private companies are scheduled to take over the program amid growing criticism from some lawmakers that the new setup needs better state oversight.

Stier told lawmakers about 45 percent of Medicaid service providers have signed up with all three private insurers. Some lawmakers on the Senate Human Resources Committee said the number should be higher.