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Check whether a number is a valid NPI number per the specifications detailed in the Final Rule for the Standard Unique Health Identifier for Health Care Providers (69 FR 3434).
npi_is_valid(x)
Boolean indicating whether npi is valid
npi
10-digit candidate NPI number
npi_is_valid(1234567893) # TRUE npi_is_valid(1234567898) # FALSE
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