Pacemaker or pacing cardioverter-defibrillator CPT® codes

1.What is the correct CPT® code for insertion of new or replacement of permanent pacemaker with transvenous electrodes(s); atrial?

2.What is the correct CPT code for removal of transvenous pacemaker electrode(s); single lead system, atrial or ventricular?

3.What is the correct CPT code for repair of 2 transvenous electrodes for permanent pacemaker or pacing cardioverter-defibrillator?

4.What is the correct CPT code for insertion of pacing cardioverter-defibrillator pulse generator only; with existing dual leads?

5.What is the correct CPT code for upgrade of implanted pacemaker system, conversion of single chamber system to dual chamber system (includes removal of previously placed pulse generator, testing of existing lead, insertion of new lead, insertion of new pulse generator)?