National Provider Identifier (NPI) to State License CrosswalkThe National Provider Indetifier (NPI) became the national standard identifier in May 2007.
The Centers for Medicare & Medicaid Services (CMS) has developed the
National Plan and Provider Enumeration System (NPPES)
to assign unique identifiers to health care providers.
The NPPES files contain all of the FOIA-disclosable data
for active and deactivated providers in NPPES.
The source NPPES files have up to 15 provider licenses per NPI. Jean Roth created the NPI to state license crosswalk below from the National Plan and Provider Enumeration System (NPPES) downloadable data file for greater ease of use. Around 25% of NPIs have more than one provider license associated with it. One limitation of this dataset is that the provider had to include their state license number on the NPI application in order for the license number to appear here.Processed versions of the source NPPES data these files are made from is also available.
Contact data@nber.org with questions, comments, or suggestions.
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