If you look at the actual costs they are going to be similar between the US and NZ, it is a global market for medical supplies and doctors. The difference is who pays
angioplasty with 2 stents (heart surgery): $17,000-$20,000
This is rarely done as elective surgery through a private hospital, so although the operation would cost that much to perform, it would paid by the district health board. Last time my father had this done the doctors were discussing during the op if they should ask for a refund from the manufacturer of the stent that didn't work.
Let's compare the price paid for cancer treatment, what would 12.5 months of hospital stays, chemo, painkillers, a nurse visiting your home everyday for a month (plus 2 months of less frequent visits), multiple doctors visits to your home (with 2 doctors so you can get an instant second opinion) cost in the US? In NZ the out of pocket payment was $2 to fill a proscription for 1,000 paracetamol tablets.
I think I will take the government healthcare