Can the hospital legally send this bill to collections?

I made payment arrangements with the hospital on a bill from May and have been paying regularly every month. In November, my insurance company finished processing my claim and made a substantial payment. My next statement from the hospital did not reflect my previous payment arrangements. I have left several... show more I made payment arrangements with the hospital on a bill from May and have been paying regularly every month. In November, my insurance company finished processing my claim and made a substantial payment. My next statement from the hospital did not reflect my previous payment arrangements. I have left several messages with the business office for the hospital to straighten this out but no one calls back. I've been making my previously agreed on monthly payments while trying to get in touch with the hospital. Today, I got a letter from a collection agency. I called the collection agency and it's not one of those dumby letters sent to scare you into paying. My question is, is this legal?? I thought that as long as I had made payment arrangements and was meeting them, I could not be sent to collections. Any back up you can give would be really helpful for when I try calling the hospital back again tomorrow. Thanks!!
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