CPT® Code 92564

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The Short Increment Sensitivity Index (SISI) is a specialized auditory test designed to assess a patient's ability to detect small changes in sound intensity, which is crucial for diagnosing sensorineural hearing loss. During the SISI test, the patient wears earphones through which a pure tone is delivered at a consistent sound level of 20 decibels. This baseline tone serves as the primary auditory stimulus. Subsequently, a second transient tone, which is slightly louder—ranging from 1 to 5 decibels above the baseline—is introduced. The patient's task is to identify these brief increases in sound intensity. The ability to perceive these subtle changes is significant, as it can indicate underlying sensorineural hearing pathology. Following the test, the results are compiled, and a written interpretation of the findings is provided to assist healthcare professionals in making informed decisions regarding the patient's auditory health.