Voice and resonance disorders (R49)
Clinical Information
Aphonia - Complete loss of phonation due to organic disease of the larynx or to nonorganic (i.e., psychogenic) causes.
Dysphonia - Difficulty and/or pain in PHONATION or speaking.
Phonation - The process of producing vocal sounds by means of VOCAL CORDS vibrating in an expiratory blast of air.
Vocal Cord Dysfunction - A disorder characterized by an intermittent abnormal VOCAL CORDS movement toward the midline during inspiration or expiration resulting in upper AIRWAY OBSTRUCTION.
Instructional Notations
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- psychogenic voice and resonance disorders F44.4