Mod 62 for talus surgery?
Debra Mitchell's advice above is good. To that I would add:
1. When considering modifier 62 on any surgery the first thing to do is look up that particular code and see if it is billable with modifier 62. Not all surgery codes are. If is is indeed a co-surgery, then both docs report the same code and both append modifier 62. If only one submits the 62 and the other does not, someone is not going to get paid.
2. If it isbillable with modifier 62, then determine if each surgeon is performing a distinct part of the same procedure, rather than Dr. B simply assisting Dr. A due to the difficulty of the case.
3. If yes, then determine that each physician has dictated his own operative report describing his unique part of the shared CPT code, and named the other surgeon as co-surgeon on their respective reports. If this was not done, you can't report it as such.
You did not provide the CPT code(s) for this particular case (always helpful), but from the info you provided, it doesn't really sound like a co-surgery to me, and would be billed as Debra M.'s advice in her last sentence.