In this section, “medical examination” means a physical examination of the ear of an individual by an otolaryngologist, otologist, or other physician. Before an audiologist or a hearing aid dispenser sells a hearing aid to an individual, the audiologist or hearing aid dispenser shall determine whether the individual has had a medical examination within the 6 months before the hearing aid service is to be provided. Unless an audiologist or a hearing aid dispenser determines that an individual has had a medical examination within the period set under paragraph (1) of this subsection, the audiologist or hearing aid dispenser: Shall give the individual a written recommendation that the individual obtain a medical examination; and Except as provided in subsection (c) of this section, may not sell a hearing aid to the individual until the individual provides to the audiologist or the hearing aid dispenser satisfactory written evidence that the individual has had a medical examination within the 6 months before the hearing aid is provided. An audiologist or a hearing aid dispenser may sell a hearing aid to an individual without complying with the requirements of subsection (b)(2)(ii) of this section only if the services are: Limited to replacement of a hearing aid; or Provided to an individual who: Is at least 18 years old; and Before a hearing aid is provided, signs a written waiver of the medical examination that otherwise is required under subsection (b)(2)(ii) of this section. Each audiologist or hearing aid dispenser shall keep a copy of each signed waiver.