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The NOS in this classification stands for "not otherwise specified"; a protean modifier throughout the classification that we shall discuss in chapter 3. |
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If we consider ICD as a prototype classification system, we can see the manner of treating the vermilion border as part of a general strategy of distinguishing central members of certain categories from outliers. The vermilion border is strictu sensu part of the skin of the lip, but it is not a good member of that category: "173.0 Skin of lip. Excludes: vermilion border of lip (140.0140.1, 140.9)" (ICD-9CM, 32). Equally, it is definitely skin, but is a special subcategory: |
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| 238.2 | Skin | | | Excludes: | anus NOS (235.5) | | | skin of genital organs (236.3, 236.6) | | | vermilion border of lip (239.0) | | (ICD-9CM, 45) |
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Or again, it is definitely soft tissue, but is an outlier: |
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| 239.2 | Bone, soft tissue, and skin | | | Excludes: | | vermilion border of lip (239.0) | | (ICD-9CM, 4546) |
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In ICD-10, its marginality is explicit, |
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| D00.0 | Lip, oral cavity and pharynx | | Aryepiglottic fold: | | | NOS | | | hypopharyngeal aspect | | | Marginal zone | | Vermilion border of lip | | (ICD-10, 1: 222) |
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This multiple reference to the vermilion border of the lip is a typical ICD naming strategy. If a region of the body might fall under several categories, its membership in a special category is explicitly marked. |
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In principle at least, the world itselfthat messy, sprawling, sociotechnical systemshould be split up into regions of relevant causal occurrence. The ICD's work is necessarily far from complete. Here, however, is one typically precise definition of a liminal zone in the outside world: |
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