Please see a link to the AAOS recommendation on 29875. We do not code 29875 with other knee scopes even if it is a different compartment.
http://www.aaos.org/news/aaosnow/jan13/managing2.asp
"CPT code 29875, limited synovectomy, is described as a ?separate procedure.? This means that the work associated with this procedure is inclusive to more extensive procedures performed in the same anatomic site (the knee) and is not separately reportable. This code should only be reported if it is the only procedure performed;
separate compartment rules do not apply."