Insurance may not cover my treatment. A clinic in the US told me 10 treatment sessions could cost $130,000 - $140,000 USD.
1. Is that accurate?
2. Please tell me what my options are for clinics in the US and other countries. I am willing to travel to another country for a cheaper price, but I find it difficult to find clinics that are knowledgeable about Ledderhose, and are willing to provide a cost estimate.

Prof. Seegenschmiedt sent me below estimate on RT for Dupuytren's in Germany:

"consultation and examination 200 Euro, RT planning and full one of two courses of one extremity 700 - 800 Euro: if 2 RT courses are needed 1.350 - 1.400 Euros."

This means about 2,000 $ for one hand for both series of treatment. If both hands need to be treated the price would roughly be 3.500 $. Usually there is a 6 weeks gap between both series. That would be a little long for someone from abroad but I would expect that there are work arounds. You would need to discuss that with the treating doctor.