National Clinical Coding 021 - Classifications Browser

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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-

  Issued