Chiropractic who except  medicaid insurance ?

They dont take Medicaid. Sometimes they dont take insurance at all. If there is one, you have to call around and ask. At least you should include your city and state in your question. Every state is different.

Fred down the street from me does. 

What a Maroon!

https://www.youtube.com/watch?v=_NYFq7ZJg4c

except or accept?

except = exclude. Meaning a chiropractor that will NOT see patients who are on medicaid EXCEPTS them from his or her practice.

A chiropractor who does provide care to medicaid patients ACCEPTS them.

You haven't mentioned a location so we can't possibly help you find a doctor within driving distance. Try asking on a local facebook group or Nextdoor app.