The Centers for Medicare & Medicaid Services (CMS) requests Medicare Administrative Contractors (MACs) update ZIP codes ZIP5 and ZIP9 for the fall of 2018 according to routine annual updates.
Subject: Instructions for Downloading the Medicare ZIP Code File for October Files
Release Date: May 18, 2018
Effective Date: October 1, 2018
Implementation Date: October 1, 2018
Special Notes: NA