1. First, I verify that their license is current.
2. Then, I generally check the state licensing board for any revocations, sanctions, or disciplinary actions.
3. I also check for malpractice suits filed against the doctor and/or the practice.
4. If the doctor comes from out of state, I check their prior state's records.
For example in Florida, I use
https://mqa-internet.doh.state.fl.us...hCareProviders to check for validity of license and this also gives me item (2) above.