(a) There may be a provision as follows:
(b) The foregoing policy provision may be inserted only in a policy which the insured has the right to continue in force subject to its terms by the timely payment of premiums (i) until at least age 50 or, (ii) in the case of a policy issued after age 44, for at least five years from its date of issue. The insurer may, at its option, include in the provision a definition of “valid loss of time coverage,” approved as to form by the Commissioner, which definition shall be limited in subject matter to coverage provided by governmental agencies or by organizations subject to regulation by insurance law or by insurance authorities of this territory or any state of the United States or any province of Canada, or to any other coverage the inclusion of which may be approved by the Commissioner or any combination of such coverages. In the absence of such definition such term shall not include any coverage provided for such insured pursuant to any compulsory benefit statute (including any Workers' Compensation Administration or employer's liability statute), or benefits provided by union welfare plans or by employer or employee benefit organizations.