Insurance will not cover it as it is not part of treatment and does not at this time change treatment modlities. There is no published evidence that unknown primaries have any relationship to
HPV.
Just out of curiousity, since your neck dissection was a few months ago, who decided to keep frozen tissue samples (in a condition that that could be analysed for any variety of purposes, by a laboratory at some time in the future) and for what pupose would they have kept those samples since a treatment plan had been established? I ask this because there are several tissue banks for tumor samples around the US, but as a rule patients do not know that their tissues have been saved in those collections of samples, they have no access to them, and they are only used for research purposes as a rule.