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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 > Other Diseases And Conditions Of The Teeth And Supporting Structures 525.* > 2007 ICD-9-CM Diagnosis 525.23 Severe atrophy of the mandible  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 Therefore, this code may be out of date.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 525.23 can be accessed here. 525.23 is a specific code that can be used to specify a diagnosis 525.23 contains 3 index entries View the ICD-9-CM Volume 1 525.* hierarchy Index entries containing 525.23: Atrophy, atrophic alveolar process or ridge (edentulous) 525.20 mandible 525.20 severe 525.23 edentulous alveolar ridge 525.20 mandible 525.20 severe 525.23 Ridge, alveolus - see also condition edentulous atrophy 525.20 mandible 525.20 severe 525.23