Why a name is not enough
A common name like John Kim can belong to multiple licensed clinicians in the same specialty, in different states, with no connection to one another. A patient confirming a referral, or a referring office confirming a specialist before sending records, cannot rely on the name alone to know they have the right person. What actually resolves identity is a small set of authoritative sources, each of which is reliable for a specific piece of the picture and none of which is complete on its own. The method below moves through them in a practical order: start broad and official, then narrow to the specific identifiers that distinguish one clinician from another with the same name.
Step one: start at the institution's own site
The most reliable starting point is not a search engine or a directory aggregator — it is the clinician's own employer. A hospital system's physician-finder page, an academic medical center's faculty directory, or a private practice's own website is maintained directly by the organization that employs the clinician, and is far less prone to the name-truncation and bulk-data errors that affect third-party aggregators (a mechanism covered in detail in this hub's guide on directory merging).
An institutional bio typically establishes the basics needed for every later step: full name as the institution records it, specialty, practice location, and often an NPI, medical school, residency, and board-certification claim. Treat these claims as a strong starting point, not a final confirmation — the remaining steps exist specifically to check them against independent sources.
Step two: confirm the NPI in NPPES
The NPI (National Provider Identifier) is a ten-digit number the Centers for Medicare & Medicaid Services assigns to every US clinician who bills for care. It is permanent and unique to one individual, which makes it the single most reliable identifier for distinguishing two clinicians who share a name. If the institutional bio lists an NPI, search that number directly in the NPPES NPI Registry, the free public lookup CMS operates, to confirm it resolves to the same name, specialty, and address the institution lists. If no NPI is given, a name-plus-state-plus-specialty search in the same registry will usually narrow a common name down to one plausible match.
An NPI confirms that a specific, enumerated individual exists under that number, with the taxonomy code and address on file. It does not confirm current licensure, current board certification, or that the clinician is still actively practicing — those require the next two steps.
Step three: check the state medical board license
Every US state has a medical board (or, for dentists, a comparable licensing authority) that licenses clinicians to practice within that state and maintains a public license lookup. A license lookup confirms whether a clinician's license is current, when it was issued, and its standing as maintained by that body — information the NPI registry does not carry.
Because licensing is state-specific, the check has to be run in the state where the clinician actually practices, not a state chosen at random. A clinician licensed in Texas and one licensed in Colorado are two separate systems entirely, even if their names are identical. Confirming that the license name matches the institutional bio and NPI record — same full name, same practice location — closes the loop between the three sources.
Step four: confirm board certification through the certifying board
Board certification is a credential granted by a specialty-specific certifying board — for physicians, one of the member boards of the American Board of Medical Specialties (ABMS), such as the American Board of Plastic Surgery, the American Board of Family Medicine, or the American Board of Radiology. A practice website's claim of board certification is common and usually accurate, but it is a claim, not a confirmation. Certifying boards generally offer a public verification tool for confirming a named clinician's current certification status directly.
This step matters because board certification can lapse, and because a practice bio is sometimes updated less promptly than a certifying board's own records. Checking directly with the board is the only way to be certain a certification claim is current rather than historical.
A worked walkthrough
Applied to a specific case, the method looks like this. Suppose a referral names a family medicine physician, John Kim, in Austin. Step one: search Austin-area health systems and practice groups directly rather than a search engine's top result — this surfaces John Sang Hee Kim, MD, practicing at Victory Medical, part of the Privia Medical Group network. Step two: the practice's own listing includes an NPI; entering it in the NPPES registry confirms a matching name, family medicine taxonomy, and Austin address. Step three: a Texas medical board license lookup for the same name confirms an active license tied to the same practice location. Step four: the American Board of Family Medicine's public verification tool confirms current certification. At the end of the four steps, the physician's identity is established independently of any single source — including the aggregator directory that turned up first in a general search.
If any one of those steps had instead turned up a different physician — a plastic surgeon in Chicago, a pediatric cardiologist in Colorado, or a dentist rather than a physician — the mismatch would be immediately obvious, because the specialty, the state, and the credential type would not line up. That is precisely the value of running all four checks rather than stopping at the first plausible-looking name.
Reconciling discrepancies
When the four sources agree — same name, same specialty, same or compatible location, current license, confirmed certification — identity is reasonably well established. When they disagree, the general rule is to trust the more authoritative source for the specific fact in question: the state board for license status, the certifying organization for certification status, the NPI registry for the existence and uniqueness of the identifier, and the institution's own site for current practice location and specialty. A third-party aggregator that conflicts with all four should be treated as the least reliable source in the set, not the tiebreaker.
Some discrepancies cannot be fully resolved from public sources — for example, when two directories list different hospital privileges for the same physician, or when a location appears on one source but not on any of the others. In those cases, the accurate and honest response is to say plainly that the sources disagree, rather than to guess which one is right. A reference that fabricates certainty where none exists is less useful than one that says clearly what is not confirmed.
Reading the credentials themselves
Once identity is established, reading the credentials correctly matters too. A few distinctions come up often enough to be worth stating plainly:
- MD vs. DO. Both are fully licensed physicians in the United States, trained through parallel but distinct paths — Doctor of Medicine (MD) and Doctor of Osteopathic Medicine (DO). Neither credential is a lesser version of the other; both require equivalent licensing and can lead to the same residencies, fellowships, and board certifications.
- FACS. Fellow of the American College of Surgeons — a professional designation for surgeons who have met the College's requirements and been admitted to fellowship. It follows, rather than replaces, board certification in a surgical specialty.
- Board certified vs. board eligible. "Board certified" means a clinician has completed the certifying board's full examination and requirements and holds the credential. "Board eligible" means a clinician has completed the training required to sit for that certification but has not yet completed or passed it (or the certification has lapsed and not been renewed). The two terms are not interchangeable, and a bio's wording on this point should be read carefully.
- Academic titles. Titles like Professor, Associate Professor, or Clinical Associate Professor describe a clinician's rank at an affiliated medical school and reflect an academic appointment process separate from clinical board certification. They indicate a teaching and academic-medicine role in addition to clinical practice, not a higher clinical credential in themselves.