US · guidance
CMS Pub. 100-04, ch. 2, § 30.5
Medicare Summary Notice (MSN)
The term Medicare beneficiary identifier (Mbi) is a general term describing a
beneficiary's Medicare identification number. For purposes of this manual, Medicare
beneficiary identifier references both the Health Insurance Claim Number (HICN) and
the Medicare Beneficiary Identifier (MBI) during the new Medicare card transition
period and after for certain business areas that will continue to use the HICN as part of
their processes.
If patients cannot furnish their health insurance cards when admitted, they may have a
MSN form showing the Medicare beneficiary identifier. A notice is mailed to a
beneficiary shortly after Part A or Part B benefits have been paid on the beneficiary’s
behalf. Deductible status is also shown on these forms.
History
(Rev. 4247, Issued: 03-01-19, Effective: 04-01-19, Implementation: 04-01 -19)
Provenance
- Source
- cms.gov
- Retrieved
- 2026-08-25
- Edition
- iom-2026-08-25
- Content hash
40bcbdef4d16a7bd018b3d1dacc5320765316ffae38b8a48a62372f47bd9fa8f
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