This provides definitions of the national policy indicators for each procedure code (and modifier, where applicable) on the Medicare physician fee schedule database (MPFSDB).
To access a file containing the quarterly additions and deletions to the list of ZIP codes requiring a plus four extension, refer to this link to the CMS website.
The JW and JZ modifier policy applies to all drugs separately payable under Medicare Part B described as supplied in a single-dose containers. Read this article to understand how these modifiers should be billed.
This document discusses the conditions and requirements of the Item fields within the revised CMS-1500 (02/12) paper claim form and the electronic equivalent elements.