Not jDNA, but many therapists choose not to take Medicaid/Medicare or any insurance for various reasons. It can create lots of paperwork for them, and then they have to wait to get reimbursed. Plus they often get paid less than what they could charge, since insurance sets limits on payment. Like, they might only reimburse, say, $80 for a 50-minute session, even if the T bills $150 (it's the same for non-mental health medical care as well--the amount I'd pay for a doctor's visit out of pocket would generally be much more than what insurance pays them).

My T doesn't take insurance (but I get partial reimbursement from insurance--60%--because I have out-of-network benefits, but have to submit the claims myself). He says it's because then insurance can dictate your care, like say you can only come in for so many sessions or with a certain frequency. This way, he and his clients get to determine treatment plans and frequency. Most of the therapists in my area, from what I can tell when I was looking for a new one (current one) on Psychology Today, don't take insurance (or presumably Medicaid/Medicare).