Paid data tool

NPI-TIN Crosswalk Search

Online access for provider TIN number lookup and NPI-to-TIN crosswalk search. Search by organization NPI to view associated Tax Identification Number records. This table provides a mapping between organizational National Provider Identifiers (NPIs) and Tax Identification Numbers (TINs) derived from provider references data. Each record represents a validated NPI-TIN association. 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.

NPI	TIN	Ind or Org NPIs Associated with This TIN
1003217712	581305331	10

Access by email magic link

Annual online search access is $30. 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.

NPI	TIN	Ind or Org NPIs Associated with This TIN

Related Tool

Need clinician NPI to plurality billing TIN lookup instead? Use the Clinician NPI-TIN Affiliation 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 NPI Organization Search to find organization NPI, name, and address.
Not all organization NPIs have a TIN crosswalk because some organization NPIs are not used in billing or contracting.
We hope to refresh this dataset every quarter.

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