That is likely too low.
The Centers for Medicare and Medicaid Services provides a National Health Expenditure estimate annually. [1]
Physician and clinical services represented $772 billion out of about $3.8 trillion, so more like 20%.
Hospital services are the other big one: about $1.2 trillion.
US physicians are paid terrifically relative to their counterparts almost anywhere else, this is especially true for specialists.
In fact, physicians represent about 15% - 16% of the top 1% of income earners in the US. See table 2 from this paper: https://web.williams.edu/Economics/wp/BakijaColeHeimJobsInco... which was written using tax return data, not, e.g., self-reported income data.
[1] https://www.cms.gov/Research-Statistics-Data-and-Systems/Sta...