- Source-confirmed
- Backed by a source-of-record check (e.g., NPPES identity, OIG LEIE federal exclusion, PECOS public enrollment).
- User-entered
- Provided by the clinician. Not primary source verified. A licensing or credentialing committee must still confirm.
- Inferred
- Derived from indirect signals (publication matching, taxonomy heuristics). Not a verified claim.
- Unknown
- No data on file from any source. Neutral — not evidence of absence.
- Conflict
- Two or more sources disagree on this field. Surfaced so a reviewer can resolve it rather than pick silently.