According to the Anthem Blue Cross Blue Shield Network Rapid Update dated 02-13-09, if claims are submitted electronically with legacy identification numbers — even if they also include the National Provider Identifier (NPI)<span id="more-1095"></span> — they will be rejected and will need to be sent back with only the correct NPI. Legacy identification numbers include but are not limited to Anthem Blue Cross and Blue Shield IDs, UPINs and Medicare identification numbers.