Resolved Question: What law in prevents health insurance companys from subrogating paid medical bills?

Resolved Question: What law in prevents health insurance companys from subrogating paid medical bills?
I live in Pennsylvania and I need to know what law prevents insurance company from subrogating medical bills paid out from a motor vehicle accident. I know there is such law because my lawyer used it for me, my friend would benefit from that law but I cannot remember what it was. Please provide a link to a official page on it.
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