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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 > Gingival And Periodontal Diseases 523.* > 2008 ICD-9-CM Diagnosis 523.5 Periodontosis  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 Therefore, this code may be out of date.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 523.5 can be accessed here. 523.5 is a specific code that can be used to specify a diagnosis 523.5 contains 6 index entries View the ICD-9-CM Volume 1 523.* hierarchy Index entries containing 523.5: Paradentosis 523.5 Parodontosis 523.5 Periclasia 523.5 Periodontoclasia 523.5 Periodontosis 523.5 Pyorrhea (alveolar) (alveolaris) 523.40 degenerative 523.5