Medical Billing for 92552 And You Performing medical billing for current procedural terminology code 92552 can be difficult to distinguish from 92551. These hearing tests are similar, but there are slight differences. When billing for these medical hearing tests, it is important to match chart notes with CPT codes. The medical billing CPT code 92552 means pure tone audiometry; air only. This is a hearing test that a physician uses when testing the limits of intensity for each frequency heard. This means, for each pitch, high or low, the physician sees what the patient can hear at the lowest intensity possible. When doing medical billing for this procedure, one must …