In March of 2014, I had a medical emergency in Kunming at about 4am. I was lucky enough to have Chinese friends with a car that came and took me to the hospital. I had gone to the Second Affiliated Hospital before so I had them take me there.
You need your passport and cash. There was a long line of cars waiting to get into the car park. The husband had the wife drive while he went in to rent a wheelchair. By the time he got the chair we were almost in the car park. I gave the wife two Chinese ATM cards and the PIN numbers so she could get cash for me. I was put in the emergency area, they rented a bed for me and used some of my money to get me admitted.
I could not stand or walk. Nor could I transition in and out of the wheel chair. The only food I ate was brought in by friends.
While in the emergency area, I saw emergency surgery performed twice a couple of beds away.
After about 48 hours in emergency, I was relocated to a 4 bed room. My friends arranged for a "body man" to assist me. He lifted, carried, and pushed me around.
One of the Chinese patients in the room also had a body man. The other two were attended by family. I had my body man put me in the chair and wheel me out of the hospital to a side street where I bought my meals. Not once in 11 days was I served hospital food.
I had a stroke and they did CTs, MRIs and x-rays and was lucky to get a neurologist who spoke good English and provided good medical care. I was asked for money after a few days and my friends showed up with some cash.
On the 11 day my sons arrived from the US. They booked a flight home. It was a little difficult to get checked out of the hospital as the airline needed a doctor's release to get on the plane.
The doctor said I should stay another week or two to be safe. I called a doctor in the US who said it would be okay to fly.
The Chinese doctor refused to release me so I told her I was her grandfather and she would have to pay. A half hour later I was in John Xie's van and on the way to my apartment.
In short, you need your passport, cash and helpful Chinese friends.
tigertiger's info is good.