A screenshot of a 2022 story in The Hill "Medicare could save $3.6B buying generic drugs at Mark Cuban pharmacy prices: study"

This article just lists “study” as the type of evidence.

How would you go about determining the level of evidence for this study?

Since the article doesn’t tell you the type of study, it’s not a quality level of evidence. All studies are reputable, so you know it’s going to be quality. The level of evidence doesn’t matter. Click on the link in the article that says “study from” to learn more about it and its level of evidence. Scan the article for mentions of “meta-analysis” and if you don’t see it, assume that the study is bogus.