It's not necessarily true that insurance companies deny payment for Ketamine infusions. We have Blue Cross/Blue Shield PPO and my wife had her 5-day in-patient low-dose infusion fully covered in Boston as well as outpatient infusions with a local physician here in Florida. In the first treatment in Boston her physician wrote a letter for the pre-approval for the inpatient treatment which outlined the studies, other failed treatments, and this treatment was generally as a last resort for pain relief. We didn't have to do this with the outpatient ones in Florida which were done by a BC/BS preferred provider. So, even though it has been generally considered experimental, the current clinical trials and documentation has helped get it recognized by insurance companies.