Notwithstanding any other provision of law, no insurer shall, with regards to medical malpractice insurance, as defined in section 383.150, implement any rate increase of more than fifteen percent without first providing clear and conspicuous written notice by United States mail to the insured at least sixty days prior to implementation of the rate increase, unless the increase is due to the request of the insured or due to a material change in the nature of the insured’s health care practice or individual’s risk characteristics.