Yes is the answer to your question about combining a filler such as Radiesse, Restylane or Juvederm after fractional Co2. The important thing as far as doing these two procedures, is timing. If you have had filler, and now would like to enhance your skin's appearance further, just make sure you give your skin a bit of time to ensure any swelling post injection has had time enough to resolve. This varies slightly from person to person, but generally after 2-4 weeks it is safe to proceed. Ideally, if you know you want both treatments, I would opt to do the laser treatment first to see how much improvement can be achieved by laser then enhance that with a filler for the ultimate result.
Dr. Manolis