USMS Masters Programs Vs. Non USMS Masters Programs

In the "Places to Swim" database, is there a differentiation between those programs that require USMS registration and those that do not? I used to think all Masters Swimming Programs were USMS. They are not. What about USMS Clubs? Aside from the club registration, do they have to enforce USMS member registration? My interest is not only related to insurance, but also in quality masters programs.