I'm in the middle of nowhere, so in my case I would need a smattering. However, almost all doctors can read/write English, even if they can't speak it. I've had 80 year old doctors proudly write down the word rheumatism, where I can barely get by with spellcheck.

In bigger cities, you'll definitely be able to find doctors who can speak English easily.

Google Translate is magical. I've used it to speak with vendors and negotiate prices in China. Not optimal, but amazing. Works on text too....