Alert detail
CMS Transmittal R13964CP: Annual Instructions for Downloading the Medicare ZIP Code Files for the Calendar Year 2027
Policy ID: CMS-T-R13964CPSpecialty: Multi-specialtyAdded: 9/30/2026Effective: January 4, 2027billing update
What changed
MACs must download CY2027 Medicare ZIP code files by Jan 4, 2027.
Who’s affected: Multi-specialty billing teams · Effective: January 4, 2027
Primary source: View the official CMS/MAC document ↗
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