For the record, I pay the same for healthcare from UHC now and it would cover the $25k cost for the specialist because they're in the UHC network.
When my wife left her job several years ago (but post Obamacare) and needed to get insurance on the open market, her Northern California Kaiser plan was roughly the same price as her employee group plan (inclusive of employer contribution). Not too long ago my sister purchased a Kaiser Mid-Atlantic plan on the open market, which was also reasonable with nearly identical coverage to the group plans I've had.
As far I understand, Kaiser is largely an outlier regarding rough cost parity between group plans and individual plans. I'd be surprised if UHC cost the same as Kaiser for the same coverage on the open market, but if you confirm then I'll have to update my assumptions.
For simple, routine needs Kaiser really does shine. Easy appointments, quick, good staff. We recently had a baby through Kaiser and pre-natal and post-partum care as well as the actual delivery was a fantastic experience. Much more so than the experiences of my peers at other non-Kaiser hospitals. Cost is all covered in employee plan.
BUT as soon as you encounter specific issues, Kaiser breaks. I’ve had persistent GI issues and was never able to find consistent specialists on Kaiser. I also lost coverage to my therapist as Kaiser only does group therapy.