I don't. For one thing there is research showing that people are much more likely to be negative on those than positive. For another I once saw my pdoc get low rankings---because someone mixed her up with a pediatrician of the same name.

They also can be very outdated. About 8 years ago all healthcare providers were assigned these numbers and the site providers created profiles using the information linked to the number. So I'm listed with the work address I had all that time ago with the invitation to rate me when I moved jobs later that year and haven't worked in 4 years.