I've looked into this matter some (talking to other Lymies, educated nurses, etc.) and here is what I've found:
-Trying to get an extension (fighting with the insurance co.) can be risky. In most cases it's probably not going to be worth while. Although, if you are left with a huge bill after doing IVs it is probably unavoidable (for most of us).
-According to a number of knowledgeful sources the insurance co. usually will pay for the first 8 weeks without too much trouble (although this can vary from one insurance co to the next as is the case with tickedoff). After 8 weeks the risks go way up.
The thing that I think is absolutely crazy (and should be illegal) is that my insurance co. (anthem) doesn't pre-approve IVs. They pre-certify. Basically, they can come back (after the fact) and refuse payment leaving me with a huge bill. Effectively, I'm gambling that they will pay for my meds. As a result, I will probably have my line pulled in 2-3 weeks. It just seems too risky given my income and poor credit (as a result of this illness).
It's really sad.....as I seem to be responding to IV therapy.
My general impression is that if you cross the invisible line (when it comes to IV therapy) you can dig yourself into a huge hole financially and potentially create problems with the insurance co. that could cause additional problems later on.