npi registry - SERP Analysis

https://npiregistry.cms.hhs.gov/

https://nppes.cms.hhs.gov/

https://www.cms.gov/regulations-and-guidance/administrative-simplification/nationalprovidentstand

https://www.aafp.org/family-physician/practice-and-career/managing-your-practice/national-provider-identifier.html

https://www.npdb.hrsa.gov/faqs/npi.jsp

https://www.providertrust.com/blog/guide-national-provider-identifiers-npi/

https://www.hca.nm.gov/providers/national-provider-identifier-information/