Cover Letters for CMNs

5.5.2 – Cover Letters for CMNs (Rev. 10749; Issued: 05-11-21; Effective: 06-11-21; Implementation: 06-11-21) Cover letters can be used by a supplier as a method of communication between the supplier and the physician. It is not CMS's intent to restrict necessary communication between the supplier and the physician. CMS does not require nor regulate the cover letter. The DME MACs and UPICs should not take adverse action against suppliers that solely involve cover letters. The DME MACs should regularly publish an article in their bulletins asking suppliers to remind physicians and suppliers of their responsibility in completing and signing the CMN or DIF. It is the physician’s and supplier’s responsibility to determine both the medical need for, and the utilization of, all health care services. The physician and supplier should ensure that information relating to the beneficiary’s condition is correct. The DME MAC and UPICs should encourage suppliers to include language in their cover letters to remind physicians of their responsibilities.