No. HIPAA is rarely straightforward, and in any event it’s not uncommon for employers to have some degree of access to claims data. In a case like this I assume the company self-funds the plan.
I'm 99% sure HIPAA just applies to medical personnel (i.e. nurses, doctors) so they can't outright share private information. Third parties (i.e. your mom or insurance companies) can share it all day without violating HIPAA.
Insurance companies are absolutely covered by HIPAA. If it’s true that the insurance company (and not some third party service or app) shared the information directly with HR this is definitely a violation.
> The fuck is my insurance company doing telling my HR what medication I'm on?
Isn't this a straightforward HIPAA violation?