Dec. 29—Stillwater Medical Center and BlueCross BlueShield of Oklahoma have come to an impasse in negotiations over who should pay for inflating costs of medical care. Both entities have announced Stillwater Medical facilities will no longer be a BCBSOK innetwork provider on May 1, 2023, unless they can compromise. BCBSOK says SMC hospitals in Stillwater, Blackwell and Perry will no longer be in…