AHA Coding Clinic® for ICD-9 - 2009 Issue 4; VOLUMES 1 & 2 NEW/REVISED CODES

Dysphonia, Hypernasality and Hyponasality

Effective October 1, 2009, subcategory 784.4, Voice and resonance disorders, has been retitled and expanded to create new codes to describe specific disorders such as dysphonia, hypernasality, and hyponasality. Dysphonia is a disorder of phonation (voice production) and is a symptom of a laryngeal disorder affecting the structure and/or function of the larynx. The larynx (voice box) is a framework of cartilage containing vocal cords. These structures vibrate to produce sounds. Traumatic injury, emotional stress, overuse, and illness may cause chronic spasm, weakness, or scarring of the vocal cords. This can affect the vocal cords and voice production...

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