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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 521.23 Abrasion, extending into pulp  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 Therefore, this code may be out of date.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 521.23 can be accessed here. 521.23 is a specific code that can be used to specify a diagnosis 521.23 contains 1 index entry View the ICD-9-CM Volume 1 521.* hierarchy Index entries containing 521.23: Abrasion - see also Injury, superficial, by site dental 521.20 extending into pulp 521.23