Yes, John explains Medicare non-par correctly.
The advantages are:
-Initial 9.25% increase in reimbursement from your previously par collections by setting fees at the the limiting charge.
-Patients pay you at the time of service, and they wait to be reimbursed by Medicare for covered amounts. Submit the claim and you're done. No billing to track or post, diminishing office workload/overhead. This is what I refer to as the "retail" model = provide a service, collect a payment.
The big problem is that you are still tied to the Medicare fee schedule, so that if there is a cut at some point, you still are affected by it.
If you are non-par with insurers other than Medicare, there is no limit on your fees. You can set whatever you consider to be fair.