Paid data tool

Clinician NPI-TIN Affiliation Search

Online access for clinician billing TIN lookup and individual NPI-to-TIN affiliation search. Search by individual clinician NPI to view the plurality billing organization TIN associated with that clinician. This table provides a mapping between individual clinician National Provider Identifiers (NPIs) and Tax Identification Numbers (TINs) derived from clinician billing records and provider references data. Data refreshed May 2026. Email Research at FastHSR dot com if you need bulk download or data licensing.

Sample result

This is an example of what a paid lookup returns.

Clinician NPI	TIN	Ind or Org NPIs Associated with This TIN
1003000126	522220700	1,653

Access by email magic link

Monthly online search access is $20 for 30 days. After payment, check the purchase email for your access link. If the link expires or does not arrive, enter the same email below to request a new link. You can do 1,000 searches in a day.

Clinician NPI	TIN	Ind or Org NPIs Associated with This TIN

Related Tool

Need organization NPI to organization TIN lookup instead? Use the NPI-TIN Crosswalk Search.

Notes

Data are provided as is.
Records may have limitations or errors from source files, but more than 99% should be correct.
Use the free Clinician NPI Search if you need to find an individual clinician NPI first.
This table reflects plurality billing TIN affiliation and should not be interpreted as employment, ownership, or exclusive contracting.
We hope to refresh this dataset every quarter.

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