Bing spent nine days at Henry Ford Hospital, where doctors repaired his punctured colon. Bing's office said the mayor is expected to be out of the office for three more weeks, the Detroit Free Press reported.
A spokeswoman for Bing told the newspaper he will continue to interact daily with his staff.
The 68-year-old mayor's hospitalization came as his administration is dealing with a financial crisis. A state-appointed panel declared the city to be in a financial emergency last month.
Gov. Rick Snyder has until Thursday to decide whether to appoint an emergency manager or allow the city to forge ahead on its own under an as-yet undetermined consent agreement.
Bing aide Kirk Lewis was named deputy mayor and took part in the negotiations while Bing was in the hospital.