If at any time that the subscriber or certificate holder is entitled to medical and surgical service no contracting physician and surgeon is available, the medical and surgical plan corporation shall provide such care by physicians and surgeons who have not contracted with such corporation, to such extent as the subscriber or certificate holder is entitled to under his certificate, and at the same rate and for the same fees as is provided for care by noncontracting physicians and surgeons, but not to exceed the limitation provided for in the certificate.