Why do i stipulation insurance for a "Free and confidential std test" ?

I'm getting tested for an STD next week, and the website says its' free and confidential. but after why did they ask what kind of insurance i have if it's free and confidential?
"> Unless it's a reputable company it's probably an insurance scam.
You should intermingle other people in the description to it so they can see whether or not it is legit.
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