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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Digestive System 520-579 > Diseases Of Oral Cavity, Salivary Glands, And Jaws 520-529 > Diseases Of Hard Tissues Of Teeth 521.* > 2008 ICD-9-CM Diagnosis 521.00 Unspecified dental caries  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 521.00 can be accessed here. Localized destruction of the tooth surface initiated by decalcification of the enamel followed by enzymatic lysis of organic structures and leading to cavity formation. If left unchecked, the cavity may penetrate the enamel and dentin and reach the pulp. The three most prominent theories used to explain the etiology of the disease are that acids produced by bacteria lead to decalcification; that micro-organisms destroy the enamel protein; or that keratolytic micro-organisms produce chelates that lead to decalcification. 521.00 is a specific code that can be used to specify a diagnosis 521.00 contains 6 index entries View the ICD-9-CM Volume 1 521.* hierarchy Index entries containing 521.00: Caries (bone) (see also Tuberculosis, bone) 015.9 [730.8] dental (acute) (chronic) (incipient) (infected) 521.00 with pulp exposure 521.03 extending to dentine 521.02 pulp 521.03 other specified NEC 521.09 pit and fissure 521.06 primary pit and fissure origin 521.06 root surface 521.08 smooth surface origin 521.07 root surface 521.08 smooth surface 521.07 teeth (internal) 521.00 initial 521.01 Carious teeth 521.00 Cavity teeth 521.00 Decay dental 521.00 tooth, teeth 521.00