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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 2007 ICD-9-CM Diagnosis 521.40 Pathological resorption, unspecified This code may be outdated. View the most recent version of ICD-9-CM 521.40 521.40 is a specific code that can be used to specify a diagnosis 521.40 contains 3 index entries View the ICD-9-CM Volume 1 521.* hierarchy Index entries containing 521.40: Pathologic, pathological - see also condition resorption, tooth 521.40 external 521.42 internal 521.41 specified NEC 521.49 Resorption dental (roots) 521.40 alveoli 525.8 pathological external 521.42 internal 521.41 specified NEC 521.49 teeth (roots) 521.40 pathological external 521.42 internal 521.41 specified NEC 521.49