Bankers Life Fieldhouse has public elevators which make all levels of the stadium accessible to the disabled. The elevators, as well as the disability drop-off, are located at the north end of the stadium. It is accessible from Bankers Life Court, a one-way street going east (off of Pennsylvania Street).
While you can get to the 200 level via elevator, you will still need to navigate stairs in order to get to row 15 of section 207. You will want to enter the section via the tunnel between sections 207 and 208, which will get you into the section at row 3. You will then need to walk up 12 rows to get to row 15, and seat 19 will be the 8th seat in from the aisle.