I would find a new doc. And I have, at least once.
My current doc is A-OK, and is the owner of the practice, so I don't think any conglomeration will be coercing him to put up such a sign.
Behold the power of the free market: The practice can set the rules they choose, and you and I can vote with our feet.
Yes, it's an over-simplification, but the principle holds true.
If you live in NYC, San Fran, Chicago, LA or DC, your options may be somewhat more limited. If you choose to disclose your Lat/Long, someone locally may be able to give you a good option or two.
And yeah, I've lived in at least three of the above.
Note the use of the past tense.