US · guidance
CMS Pub. 100-04, ch. 1, § 160
Identifying Institutional Providers
Since May 23, 2007, Medicare institutional providers submit only the ten position
numeric “National Provider Identifier” (NPI) as their provider identifier.
References to the six position alpha-numeric CMS Certification Number (CCN)
(previously called the OSCAR number) found throughout the chapters of the Medicare
Claims Processing Manual, on an ongoing basis, are supplied only for the purpose of
CMS internal processing. Therefore, these references are documented as “for CMS use
only”.
History
(Rev. 11794, Issued:01-19-23, Effective: 04-01-23, Implementation:04-03-23)
Provenance
- Source
- cms.gov
- Retrieved
- 2026-08-25
- Edition
- iom-2026-08-25
- Content hash
5ae04b9b76eecc92d14e690da06929158c135e4b97427ee59810d4140c746f2d
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