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2007 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.* > 2007 ICD-9-CM Diagnosis 521.31 Erosion, limited to enamel This code may be outdated. View the most recent version of ICD-9-CM 521.31 521.31 is a specific code that can be used to specify a diagnosis 521.31 contains 1 index entry View the ICD-9-CM Volume 1 521.* hierarchy Index entries containing 521.31: Erosion dental (idiopathic) (occupational) 521.30 limited to enamel 521.31