An insurer issuing policies of professional liability coverage for claims arising out of the rendering of, or the failure to render, medical care or services shall make available to physicians licensed under chapter 458 and to osteopathic physicians licensed under chapter 459 coverage with the following limits, subject to usual underwriting standards:
(1) One hundred thousand dollars per claim, $300,000 annual aggregate; and
(2) Two hundred fifty thousand dollars per claim, $750,000 annual aggregate.