As long as workplace rehab has been approved as reasonably necessary for your work-related injury, all costs will be covered.
The insurer typically begins paying for workplace rehabilitation services once the worker's injury has been accepted as part of a workers compensation claim and the need for rehabilitation has been assessed. This often includes an initial assessment and development of a rehabilitation plan.
Payments for these services can begin early in the process to facilitate a return to work and are based on recommendations from treating medical professionals or rehabilitation providers.
Specific timelines may vary depending on the insurer and the details of the claim.