Physician salary is only 9% of total healthcare cost. The rest of the labor pool is administrative - clerks, management, etc.
Physicians also make 2-3x more than physicians in other countries. Why? Their education cost is also 2-3x higher than in other countries.
Hospitals and procedures are expensive, in part because of insurance. Insurance is high because our society is too litigious. It's also expensive because of consolidated private healthcare systems that can control and mark up prices due to lack of competition.
Other countries spend half what we do on healthcare. And their people are often healthier.