There’s already a lot of studies about this

More than half of excess U.S. health spending was associated with factors likely reflected in higher prices, including more spending on: administrative costs of insurance (~15% of the excess), administrative costs borne by providers (~15%), prescription drugs (~10%), wages for physicians (~10%) and registered nurses (~5%), and medical machinery and equipment (less than 5%). Reductions in administrative burdens and drug costs could substantially reduce the difference between U.S. and peer nation health spending.

https://www.commonwealthfund.org/publications/issue-briefs/2...