Can a hospital bill garnish your wages?

I just looked up my credit and saw a $3,000 debt. I can to see what it was, I was told I owe a hospital the money and if I don't pay I will have my wages garnished. I gave them my insurance info at the time and wasnt told before or after that it was denied for whatever reason. I had moved since then thinking it was covered so recieved no notice. Is it legal for them to garnish me if they didnt let me know my insurance wasnt excepted?