Example: dental hygienist
National Clinical Coding 021 - Classifications Browser
issued an updated version in 1950, and revisions to this were subsequently issued in 1956, (first revision), 1969 (second revision) and 1975 (third revision). This first classification contained 664 un-subdivided three-character categories. It was revised in 1956 with the addition of 10 categories, and again in 1969 at which time the three-
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