Providers who wish to transition to billing BWC using their NPI information only should first bill using both identifiers (the BWC provider number plus the NPI). BWC will add new explanation of benefit codes to remittances to confirm it has added NPI data to a provider’s record. Once confirmed, the provider may choose to bill using the NPI rather than the BWC provider number. BWC plans to be able to handle either scenario by May 23, 2007.