maximum time allowed between 2nd MBB and 1st RFA?

After two successful Dx blocks, is there a maximum time allowed within which RFA has to be done? I have a patient in this situation, and we are holding off on RFA for a number of reasons, but wanting to know how long we can delay the RFA, without having to potential start over with MBB again, or do the RFA only to have it denied for payment. He has BCBS Commercial insurance. I do not see anything about this in BCBS medical policy or Medicare LCD.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Pain Medicine Source Type: forums