Continuous Passive Motion Machines (CPM's) are a covered benefit for most insurance companies under HCPCS code E0935 (knee) or E0936 (other than knee) but there are a few exceptions, typically diagnosis related.  If your insurance company does not cover the rental of the CPM Machine, we charge a $350 flat fee for up to 21 days and $15 per day after the initial 21 day rental period.