You're right...I had some difficulty finding this on CMS. I was, however, able to locate something on my local website. Maybe this will be helpful.
Appropriate Use of Modifier -62 for Co-Surgery
Recently, CIGNA Government Services Medical Review found that several providers were incorrectly appending the modifier -62 to every surgical procedure code billed during the same surgical session. The AMA CPT 2001 descriptor for modifier -62 says that "When two surgeons work together as primary surgeons performing distinct part(s) of a single reportable procedure, each surgeon should report his/her distinct operative work by adding the modifier -62 to the single definitive procedure code. Each surgeon should report the co-surgery once using the same procedure code. If additional procedure(s) (including add on procedure(s)) are performed during the same surgical session, separate code(s) may be reported without the modifier -62 added."
There are four guidelines that should be used when billing for co-surgery.
Modifier -62 is for use by two surgeons who work together as primary surgeons.
Modifier -62 should be added to the primary procedure. Each co-surgeon should use modifier -62 only once. It should not be linked to additional codes, including add-on codes.
Each of the co-surgeons may act as an assistant surgeon for additional procedures.
Surgeons of the same or different specialty can use modifier -62, but unlike assistant surgeons, each co-surgeon must dictate a separate operative report documenting his/her distinct operative work. The operative report should indicate the medical necessity for having two surgeons act as co-surgeons.
Look on page 37 on the below link.
http://www.cignagovernmentservices.com/partb/education/video/medicare101/101_mod3.pdf