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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Symptoms, Signs, And Ill-Defined Conditions 780-799 > Symptoms 780-789 > Symptoms Involving Head And Neck 784.* > 2007 ICD-9-CM Diagnosis 784.40 Voice disturbance unspecified  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 Therefore, this code may be out of date.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 784.40 can be accessed here. Disorders of voice pitch, loudness, or quality. Dysphonia refers to impaired utterance of sounds by the vocal folds. 784.40 is a specific code that can be used to specify a diagnosis 784.40 contains 2 index entries View the ICD-9-CM Volume 1 784.* hierarchy Index entries containing 784.40: Defect, defective 759.9 voice 784.40 Disturbance - see also Disease voice 784.40