Ask Dr. Z

If the patient has a dual chamber pacemaker, came in for a venogram where the dislodged atrial lead was removed and due to stenosis could not receive the planned CRT upgrade, does the patient now have a single or dual chamber pacemaker since they still have the same generator minus a lead? I ask because I am trying to code the following encounter where the patient returns for a bivent system, but documentation does not indicate the generator is removed, but states a dual chamber pacing system was placed. They used the existing ventricle lead and placed an atrial lead. The ventricle lead was repositioned. What CPT® codes are used?