Do you know why licensed social workers can bill for Medicaid, but licensed counselors cannot?

In the US
It’s frustrating because I am working in a position in which both counselors and social workers do the same work (however, I would be unable to advance to a supervisor position because of the billing issue, even if I was most qualified).....it just doesn’t make any sense to me why there is the limitation for counselors (LPCs).

Can anyone shed some light on the subject for me?

Counselor’s have been trying to push changes through legislation, so far no changes have been made…..