Other contributors have said "What does NPI and PII stand for?" is the same question as "What is a physician NPI number?" If you believe that these are not asking the same thing and should be answered differently, click here
NPI is the national provider identification number. ME is the medical exam number (or, alternatively, the state identification number). So, the answer would be no, these numbers are not the same.
The number of patients per physician, and number of visits per patient per year, and number of total patient visits per physician per day and year varies widely by specialty and setting and a matrix...