Hi, I am a newby and already loving this! Okay, one of my clients had to reactivate his agreement with Medicare. In doing so they assigned a new PTAN # to the Dr and the old PTAN # is not in the system any longer. Consequently, my clearinghouse needed the enrollment redone. SO we sent all the necessary documentation and forms to Medicare. Question... Will the new PTAN # be associated with the Dr's NPI number once Medicare completes this reactivation? When the claim is done, is Block 32a and 33a given the facility NPI number? Block 24 is the rendering Doctor's NPI #? Thanks in advance for your help.