She began her acting career in New York City in the mid-1950s. In 1958, Corsaut and Steve McQueen made their film debuts in the independent cult horror film, The Blob.
Corsaut first appeared on the long-running Griffith show in 1963 as schoolteacher Helen Crump, who later became the Mayberry sheriff's wife on the first episode of the spinoff Mayberry R.F.D.. Corsaut also had a continuing role as policeman Bumper Morgan's pawn-shop-owner friend on the series The Blue Knight and as Irma Howell in the short-lived series Mrs. G. Goes to College. In the TV series Adam-12, Corsaut portrayed Officer Pete Malloy's girlfriend, Judy. She had a supporting role as Head Nurse Bradley in the 1980s sitcom House Calls, and also appeared in several episodes of Matlock with star Andy Griffith. In addition, Corsaut played the role of nurse Jesse Brewer in 1977 on the long-running ABC soap opera General Hospital when long-time portrayer Emily McLaughlin was too ill to work.
She returned to the role of Helen Crump in the reunion shows Return to Mayberry in 1986 and The Andy Griffith Show Reunion in 1993.
On November 6, 1995, Corsaut died of cancer in Studio City, Los Angeles, California, just three days after her 62nd birthday. She was interred at Valhalla Memorial Park Cemetery in North Hollywood, Los Angeles.