This happened to me with humera. Because I had been on it previously, I did not have to go through the pre authorization process. Hope it's the same with you. My co pay was the same and the change of insurance was seamless. Wishing you luck!!
Dx: Spondyloarthropathy/Connective Tissue Disorder (2/12), AS (9/12) HLA B27 negative, sacroilitis on x-ray - Current Meds: Methotrexate (20 mg), Leucovorin (30 mg), Protonix, Relafen, Vicodin and Tramadol PRN, Enbrel (9/12) Humira (7/15)