Mri & bone scan impression is suspecious metastatis, bmd show osteopenia spiral, m.Band negative, s.Cortisol 30 with dexona 1 mg, biopsy needed?

Perhaps. Discuss your situation with your primary doctor or the one who ordered those tests. If you are feeling uncomfortable, it may be good to get a second opinion from an oncologist (a cancer specialist). Do not wait. Time can make a difference in how you do.
Yes. If there is no previously known metastatic disease, and now MRI and bone scan show evidence of cancer spread to the bone, it is very likely that a biopsy to confirm the findings will be done prior to any change in therapy.