CPT® Code 92550

Tympanometry and reflex threshold measurements are diagnostic procedures utilized to assess the functionality of the middle ear. Tympanometry specifically evaluates the mobility of the tympanic membrane, commonly known as the eardrum, which is crucial for proper hearing. This test is instrumental in identifying various middle ear conditions, including the presence of fluid accumulation, negative pressure within the middle ear, perforations in the tympanic membrane, disruptions in the ossicular chain, and conditions such as otosclerosis. During the procedure, a physician first inspects the ear using an otoscope to ensure there are no visible obstructions or abnormalities. Following this examination, a tympanometry device is inserted into the ear canal, where it applies a controlled amount of air pressure. This pressure variation causes the eardrum to move, and the resulting movements are graphically represented on a tympanogram, which provides valuable insights into ear health. In addition to tympanometry, acoustic reflex threshold testing is performed to evaluate the response of the stapedius muscle and tensor tympani to loud sounds. These muscles play a critical role in protecting the inner ear from excessive sound levels by contracting and thereby altering the position of the stapes bone. The acoustic reflex threshold is defined as the minimum sound level that triggers a reflex contraction of the stapedius muscle, indicating the integrity of the auditory pathway. This testing is conducted using the same equipment as tympanometry, where a loud sound is introduced, prompting the stapedius muscle to contract and resulting in a measurable change in middle ear immittance. The physician is responsible for reviewing and interpreting the outcomes of both the tympanometry and acoustic reflex threshold tests, which are essential for diagnosing and managing middle ear disorders.