BSIC is composed of NCC + BCC. Both are numbered from 0-7 so you have 64 codes now.NCC is the network color code given to opearator and BCC is the base station color code which is also 0-7 and defined by RF planner of your network.
For handovers check neighbors in the source cell having same BCCH with same BSIC (CO-BCCH).