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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 523.0 Acute gingivitis  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 Therefore, this code may be out of date.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 523.0 can be accessed here. 523.0 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 523.* hierarchy 523.0 excludes: acute necrotizing ulcerative gingivitis (101) herpetic gingivostomatitis (054.2)