Commercial Uses (with important distinctions):

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Credentialing and Verification: It's a primary source for hospitals, healthcare organizations, and professional bodies to verify a physician's education, training, licensure, and board certifications. This is crucial for patient safety and ensuring qualified healthcare providers.
Health Workforce Planning: Government agencies, researchers, and health organizations use the data to analyze physician supply, demand, distribution, and trends in the medical workforce for planning and policy development.
Research: Academic institutions, government entities, and private sector researchers utilize the data for statistical analysis, market research, and understanding healthcare patterns.
Fraud Prevention: The AMA maintains records of deceased physicians and uses the data to help identify and prevent individuals from fraudulently misrepresenting themselves or using others' credentials.

The AMA licenses its demographic security and commodity brokers email list and professional data to Health Information Organizations (HIOs) and data mining companies (like IQVIA).
Crucially, the AMA itself does NOT collect, license, or sell individual physician prescribing data.
However, HIOs often combine the AMA's professional data with other datasets they acquire, such as prescribing data (purchased from pharmacies or other sources). This combined "enriched" data can then be sold to pharmaceutical companies for sales and marketing purposes (e.g., to inform sales representatives about a physician's prescribing habits).
The AMA Physician Data Restriction Program (PDRP).