I billed BCBS using my prividers individual tax ID, and we've already received the EOB from BC. BCBS is the primary ins. However, in the mean time, two of my providers are forming a "group" and they now have new NPI #'s and tax ID #'s. Also, they've applied for a Medicaid provider ID using the group numbers. Does it matter if I file the Medicaid secondary using the new Medicaid group ID, when the BCBS claim was under the old tax ID and NPI? Hope this makes sense. thank you, Ryanne