chapter  9000
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Voice Disorders: Undiagnosed or Not Otherwise Specified (NOS)

This category is appropriate for those cases that do not satisfy the classification criteria described in this text. It may be that the clinician is unable to determine the source of dysphonia, or that the classification criteria may not be met in totality, or that a suspected diagnosis is pending. Thus, this category may be used for patients with complaints of significant and consistent voice changes, or dysphonia that cannot be explained by a medical condition or substance use, and who do not meet criteria for other conditions described in this text.