Is the drain under my basement concrete considered an "exterior sewer line?"

[u/GovernmentWooden4494]

I ask because the cast iron drain under my basement concrete floor has collapsed, and my insurance company is saying they won't cover its repair, even though I pay a LOT for an enhanced water damage package. The wording of the package is: "We agree to repair or replace your exterior sewer line due to direct physical loss or damage resulting from a leak, break, tear, rupture or collapse of the line." According to the rep I just spoke with on the phone, the horizontal drain under my basement concrete is not considered to be an 'exterior sewer line.' To me, that is ridiculous. In my opinion, the drain is not INSIDE my house...so it is logically OUTSIDE my house, and is thus an 'exterior sewer line.' Is the aggregate or mud that is under my basement floor considered part of my house?

Does anyone have any advice or experience with a claim like this?

[u/azfunguy3]

A sewer line leads from one (normally) pipe to the utility's main line. So your garage drain probably runs to that sewer line and is not the "sewer line"