if i file for a motion to dismiss for sol on a old medical bill and it's denied, will i loose my right to argue my case?

No, you will not lose your right to contest the debt.  You have a right to contest the debt with any defenses that may be relevant to your case.  If one of your defenses is rejected, you still maintain the right to raise other defenses. This is not intended to be legal advice, and is general in its nature. No attorney-client relationship exists or is formed by this information. Furthermore, this does not represent the views or opinions of LexisNexis or its affiliated companies.