Old medical debt I’ve never received

Apologies if it’s been asked but I couldn’t find something like what I need.

I hadnt looked at my report for years until recently and noticed an old medical debt, it’s small (165$) but really hurting my score. I called the hospital it’s from and they stated the bill was undeliverable which is why I never saw it. Would that be enough to get it dropped? It was transferred to a collection agency and is not payable directly to the hospital anymore. I’m assuming it’s going to be considered my fault that it was “undeliverable” but I figured it’s worth a shot to ask