A man who had been treating patients for four years was charged with faking medical credentials to pose as a heart and lung surgeon.

Dennis E. Roark was arrested Friday on charges he forged a medical school degree and other documents that he used to obtain a Michigan doctor's license in 1994. If convicted, he could face up to 14 years in prison."It's embarrassing for us. We wish it hadn't happened," said Tom Lindsay, director of the state medical licensing board.

Investigators said Roark worked from 1994 until early this year in the urgent care center at Madison Community Hospital in suburban Detroit.