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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Skin And Subcutaneous Tissue 680-709 > Other Diseases Of Skin And Subcutaneous Tissue 700-709 > ICD-9-CM Diagnosis 700 Corns and callosities A clavus or small conical callosity caused by pressure over a bony prominence, generally a toe. Localized hyperplasia of the horny layer of the epidermis due to pressure or friction. (Dorland, 27th ed) 700 is a specific code that can be used to specify a diagnosis 700 contains 7 index entries