1 â¢ Print, sign and date the two-page Certification. Statement and mail it along with all requested. supporting documentation to the Medicare. contractor. 2  Note: 3  Do not mail the CMS-855 paper that can. be printed from Internet-based PECOS.  Retain this information for your records.
Definition of mastic. 1 : an aromatic resinous exudate from mastic trees used chiefly in varnishes.
Mastic is a sticky substance exuded from the branches and trunk of the mastic tree (Pistaccia lentiscus var. chia), which grows in the eastern Mediterranean and North Africa.astic is a sticky substance exuded from the branches and trunk of the mastic tree (Pistaccia lentiscus var. chia), which grows in the eastern Mediterranean and North Africa.