Wiki Reimbursement guidelines when using modifiers

[knedley]

I am looking for a breakdown on reimbursement when specific modifers are utilized for surgical procedures. Are there written guidelines for reimbursement percentage when using 59, 78, 58, 76 or any appropriate modifier which can be appended to a surgical CPT?

ie: 51 modifier on the second surgical procedure, same date, same site - reimburses at 50% of allowable, per contract.

Any direction provided would be greatly appreciated.