Individuals, other than sole proprietorships, do not have a NAICS code. They are for business customers only. There are codes for several different types of medical businesses, but there is no code for a doctor. The same is true for butchers, bakers, and candle stick makers.
The Bureau of Labor Statistics has codes for occupations.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.