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.
Overview. Mastic is a sticky substance derived from the Pistacia lentiscus tree, also called Chios mastic. This tree grows naturally in North Africa and countries on the eastern side of the Mediterranean sea. As a supplement, mastic is available in capsules or can be chewed as a gum.eople have traditionally chewed mastic gum to relieve digestive upset, according to physician and medical writer, Dr. Andrew Weil. It may ease gastritis and upset stomach, and decrease inflammation in the gastrointestinal tract.