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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 521.5 Hypercementosis  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 Therefore, this code may be out of date.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 521.5 can be accessed here. A regressive change of teeth characterized by excessive development of secondary cementum on the tooth surface. It may occur on any part of the root, but the apical two-thirds are most commonly affected. (Dorland, 27th ed) 521.5 is a specific code that can be used to specify a diagnosis 521.5 contains 3 index entries View the ICD-9-CM Volume 1 521.* hierarchy 521.5 also known as: Cementation hyperplasia Index entries containing 521.5: Hypercementosis 521.5 Hyperplasia, hyperplastic cementation, cementum (teeth) (tooth) 521.5 dentin 521.5