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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 > Dentofacial Anomalies Including Malocclusion 524.* > 2007 ICD-9-CM Diagnosis 524.23 Malocclusion, Angle's class III  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 Therefore, this code may be out of date.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 524.23 can be accessed here. Malocclusion in which the mandible is anterior to the maxilla as reflected by the first relationship of the first permanent molar (mesioclusion). 524.23 is a specific code that can be used to specify a diagnosis 524.23 contains 5 index entries View the ICD-9-CM Volume 1 524.* hierarchy 524.23 also known as: Mesio-occlusion Index entries containing 524.23: Angle's class III 524.23 Anomaly, anomalous (congenital) (unspecified type) 759.9 dental arch relationship 524.20 angle's class III 524.23 mesio-occlusion 524.23 Malnutrition (calorie) 263.9 severe 261 angle's class III 524.23 Mesio-occlusion 524.23