Give your documentation a shot in the arm with this NGS worksheet. To boost your chances of dual-chamber cardiac pacemaker coverage, head over to the National Government Services (NGS) website for a peek at a checklist that could help support medical necessity for your claims. The issue: The solution: If you'd like to download the checklist, start at www.ngsmedicare.com. Under the Part B menu, choose Forms. Under Documentation, click "Dual-Chamber Cardiac Pacemaker NCD-Based Checklist." Alternatively, you may find Forms listed in the drop-down menu under Resources, which is located in the top menu on the NGS home page.