Bell signed a one-year contract with the Bengals on Thursday, Ian Rapoport of NFL Network reports.
Bell is slated to be released by the Panthers ahead of the start of the new league year Wednesday.
Bell finished the regular season with 69 tackles (42 solo) and one interception on two passes defended in 13 games.
Bell recorded seven total tackles (four solo) in Sunday's 33-30 loss to the Packers.
Bell (shoulder) doesn't have an injury designation for Sunday's game against the Saints after logging a full practice Friday.
Bell (shoulder) was a limited participant during practice Wednesday.
Bell (shoulder) is listed as out for Sunday's game at Tampa Bay.
Bell (shoulder) did not participate at practice Wednesday.
Bell (shoulder) has been ruled Mike Kaye of The Charlotte Observer for the remainder of Sunday's game against the Titans, Mike Kaye reports.
Bell has exited Sunday's game against the Titans with a shoulder injury, Darin Gantt of the Panthers' official site reports.