Discovery - Inconsistent!

I am on a plan with Discovery that only covers in hospital costs. However, I recently had cataract removal and lens replacement in both eyes. The doctor required specific measurements as I had laser surgery many years ago. This was done prior to the operation and Discovery rejected my claim as it was not in hospital. I believe that this rejection wrong as it was directly required for the operations, and would not have been done if I had not required the cataract/lens surgery. I believe therefore that it should be covered by the authorizations and reimbursed to me.