Operating Microscope

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Can both surgeon and assistant bill for the cpt 69990 during the same session? The scope is not bundled but I was under the impression a scope could only be billed once per session? Could someone please advise me and where they are getting the guidelines for this if true?
You can go to the MPFSDB http://www.cms.hhs.gov/PFSlookup/ to see what modifiers can be used. The 69990 has a "2" in the Assistant Surgeon column which states "Payment restriction for assistants at surgery does not apply to this to this procedure. Assistant at surgery may be paid." You can also find the same information in the AAPC Procedural Coding Professional book for 2008.