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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 2007 ICD-9-CM Diagnosis 524.21 Malocclusion, Angle's class I This code may be outdated. View the most recent version of ICD-9-CM 524.21 Malocclusion in which the mandible and maxilla are anteroposteriorly normal as reflected by the relationship of the first permanent molar (i.e., in neutroclusion), but in which individual teeth are abnormally related to each other. 524.21 is a specific code that can be used to specify a diagnosis 524.21 contains 5 index entries View the ICD-9-CM Volume 1 524.* hierarchy 524.21 also known as: Neutro-occlusion Index entries containing 524.21: Angle's class I 524.21 Anomaly, anomalous (congenital) (unspecified type) 759.9 dental arch relationship 524.20 angle's class I 524.21 neutro-occlusion 524.21 Malnutrition (calorie) 263.9 severe 261 angle's class I 524.21 Neutro-occlusion 524.21