PORTLAND — Walgreen Co. has paid $350,000 to settle claims involving billings to MaineCare, U.S. Attorney Thomas E. Delahanty II announced today.

The pharmacy chain was accused in a civil complaint of unjust enrichment between November 2007 and July 2010. The complaint alleges that the company billed MaineCare, the state’s Medicaid program, for prescriptions and dispensing fees without obtaining signatures from customers picking up those prescriptions, as required by MaineCare rules and regulations.

The investigation was conducted by the Maine Department of Health and Human Services’ Program Integrity Unit, the U.S. Attorney’s Office and the U.S. Department of Health and Human Services. The U.S. Attorney’s Office said the company was fully cooperative.