The advice in the other answers is very good.
Do be careful of local hospitals here (in Birmingham, Alabama) that will send you to collections fairly quickly. AmSher is one collection agency that is very aggressive. I have sued them frequently for illegal voicemails.
They often use "auto dialers" or computer dialers to call and if you did not give your cell phone number to the hospital, then these calls are illegal and you may be entitled to $500 or $1500 per call. If you did give your cell phone number, you can revoke it.
Here are a couple of guides I have written that may give you some insight if you get turned over to collections - hopefully you won't and you can put this behind you....
Usually they wont send you to collections as long as you are sending money each month. You should ask them if you can reduce the monthly amount you are paying since you are unemployed. Most medical places will negotiate with you unless it is already in the hands of a collection attorney
I agree with my colleague. You should call the hospital to see if they will accept a lower monthly payment. Try to get the agreement in writing if possible. They should not send you to collections as long as you are sending money each month. Good luck.
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Disclaimer: Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue. This answer does not create an attorney-client relationship.