In Colorado, these are referred to as EPO (Eclusive Provider Organization) plans, and there is zero coverage for providers outside the EPO except for emergencies.
I will likely move to an EPO plan for 2018 because the cost savings compared to a standard PPO plan. Non-subsidized the difference was less than $20/m for a 53 y/o male in 2017, but it is over $100/m in 2018 for a 54 y/o male.
At present, I am far more likely to need coverage for a short term medical illness or trauma injury than a long term medical issue. I will be covering my more adventurous out of state exclusions with either medical evacuation insurance or an annual travel policy.
When I have looked at plans in the past as a ski patroller, the costs were generally under $20/m with limited helicopter coverage in the US.
If you are an avid skier in the US on an individual policy, it is unlikely that you policy has air ambulance/ helicopter coverage. While not devastating to a Mustachian saver, a flight from Breckenridge to level 1 trauma center in Denver was about $25,000 a few years ago.