The American Medical Association generates the majority of its revenue from the licensing and sale of proprietary billing codes (CPT codes).
"No, actually they make most of their money off of billing codes. So they have proprietary billing codes they sell to insurance companies, hospitals, doctor's offices." (said at 0:57:10)
A search of biomedical databases (PubMed and Europe PMC) yielded no peer-reviewed studies or publications evaluating the specific revenue breakdown or financial auditing of the American Medical Association's licensing and sales of Current Procedural Terminology (CPT) codes. This is primarily an institutional financial/accounting matter typically disclosed in IRS Form 990 filings and annual reports rather than indexed biomedical literature. Consequently, the claim is unverified within the indexed scientific literature, which does not prove the claim false.