Regarding your question on the underlying dataset: The data is sourced from the National Plan and Provider Enumeration System (NPPES). The NPPES is a governing body created by the Centers for Medicare and Medicaid Services (CMS) to issue mandatory National Provider Identifier (NPI) codes to all healthcare providers in the United States. NPI codes are unique 10-digit numbers used to identify healthcare providers. Healthcare providers include both individual practitioners (e.g. doctor, nurse) and organizations (e.g. hospital, clinic). The administrative simplification provisions of HIPAA require all covered healthcare providers, plans and clearinghouses use NPIs in administrative and financial transactions (e.g. claim payments, referrals, diagnosis coding, etc.). If a provider is no longer practicing, they are responsible for manually deactivating their NPI with the NPPES. The NPPES publishes updated NPI data on a weekly basis. Visit cybersyn.docs.com for more information.