Question: Ohio Subscriber Answer: Both the videostroboscopy and the laryngoscopy examine the larynx. The videostroboscopy also allows the otolaryngologist to assess vocal-cord function. The diagnostic laryngoscopy leads the otolaryngologist to use a flexible or rigid laryngoscope equipped with a light strobe to better visualize the vocal cords. Thus, 31579 is a more extensive procedure than 31575. Since the videostroboscopy includes the initial diagnostic procedure, reporting 31575 in addition to 31579 is redundant.