The commissioner shall not approve a medical professional liability insurance policy written on a “claims made” basis by any insurer doing business in this Commonwealth unless the insurer shall guarantee to the commissioner the continued availability of suitable liability protection for a health care provider subsequent to the discontinuance of professional practice by the health care provider or the termination of the insurance policy by the insurer or the health care provider for so long as there is a reasonable probability of a claim for injury for which the health care provider may be held liable.