Primary insurance is Auto(Facility not contracted) Claim was billed @ 100% of charges with no adjustments. The Auto Insurance exhausted and claim must go to secondary insurance in which facility is contracted with. Per the contract with the secondary insurance, the implants used must be billed at cost plus a 5% markup which is less than what we billed the primary. How do we bill the secondary per contract if we billed the primary charges as we would a non-contracted carrier. Can the charges be changed on the secondary claim to abide by our contract even though the charges were higher on the primary claim? If the charges are not changed the secondary carrier will consider charges much higher than we are actually entitled to per our contract. Very confused