WASHINGTON, D.C. (August 27, 2015)—From July 20 through 24, 2015, Medicare Fee-For-Service (FFS) health care providers, clearinghouses, and billing agencies participated in a third successful ICD-10 end-to-end testing week with all Medicare Administrative Contractors (MACs) and the Durable Medical Equipment (DME) MAC Common Electronic Data Interchange (CEDI) contractor. CMS was able to accommodate most volunteers, representing a broad cross-section of provider, claim, and submitter types.