Section 16C. Temporary registration as a qualified podiatric physician may be granted to a visiting podiatric physician holding a license to practice in another state or territory or in the District of Columbia and having a temporary faculty appointment certified by the chairman of the board of registration in podiatry for purposes of podiatric medical education, such registration to terminate automatically upon termination of the faculty appointment and, in any event, at the end of eight months; to a podiatric physician holding a license to practice in another state or territory or in the District of Columbia to permit him to act as a substitute podiatric physician for a registered podiatric physician in the commonwealth, to be granted only upon written request of said registered podiatric physician and to be limited to three months or less; and to a podiatric physician eligible for examination or registration in the commonwealth who is a diplomate of a specialty board approved by the American Podiatry Association to permit him to act as a substitute podiatric physician for a registered podiatric physician in the commonwealth, to be granted only upon written request of said podiatric physician, to be limited to the specialty to which the applicant is certified and to be limited to three months or less. The fee for such temporary registration in any case shall be determined annually by the commissioner of administration under the provision of section three B of chapter seven.