Providers are reminded that once a claim is submitted with a National Provider Identifier (NPI), the associated Medi-Cal "legacy" provider number(s) will be end-dated. In other words, effective for dates of service beyond the date of a claim submitted with an NPI, the Medi-Cal provider number will no longer be valid.

Using the associated Medi-Cal provider number(s) following a claim submission with an NPI will result in claim denials for subsequent dates of service. Once providers begin using their NPI on claim submissions, they are strongly encouraged to continue using the NPI to prevent claim payment interruption.