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We frequently update our articles to reflect the latest changes and updates to Medicare, and strongly recommend you visit this article at link below to confirm you have the latest version.
Printed Date: 9/22/2015
Starting January 1, 2020, you must use Medicare Beneficiary Identifiers (MBIs) when billing Medicare regardless of the date of service. We will reject claims you submit with the Health Insurance Claim Number (HICN), with a few exceptions and reject all eligibility transactions. The transition period during which they system accepts both HICNs and MBIs ends on December 31, 2019.
Protect your patients' identities by using the MBI now. See the CMS Medicare Learning Network (MLN) Matters Article New MBI: Get It, Use It (PDF, 213 KB) for other helpful information, such as how to get the MBI, and what to do if an MBI changes.
For more information, see the MLN Matters Article (PDF, 213 KB).
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Last Updated: 11/18/2019