At present, there is no federal law mandating physicians to take medicaid.
Whether or not you take it, is your prerogative.
It is a little different than medicare
There is no formal opt out policy (and waiting period of 2 years if you want to rejoin)
The only issue they have is if you are limiting your practice, you must not discriminate based on age, sex, religion, etc
I would suggest that you call this number (NNN) NNN-NNNN- this is the Oregon Health Services Provider Services number
I am sure that you have some more questions which you would want to ask them
But contrary to Medicare (in which you would not be able to bill if you were formally opted out), you can still see Medicaid patients in a different setting
At least that is what is according to published information. But I would call the 800 number I gave you
I hope that this helped
please leave positive feedback if it did :-0