a. Every small employer health benefits plan that provides hospital or medical expense benefits and is delivered, issued, executed or renewed in this State pursuant to P.L. 1992, c.162 (C.17B:27A-17 et seq.), or approved for issuance or renewal in this State by the Commissioner of Banking and Insurance on or after the effective date of this act, shall provide benefits to any person covered thereunder for expenses incurred in obtaining an orthotic or prosthetic appliance from any licensed orthotist or prosthetist, or any certified pedorthist, as determined medically necessary by the covered person's physician. As used in this section, "orthotic appliance," "prosthetic appliance," "licensed orthotist" and "licensed prosthetist" have the meaning assigned to them in section 3 of P.L. 1991, c.512 (C.45:12B-3) and "certified pedorthist" has the meaning assigned to it in subsection j. of section 18 of P.L. 1991, c.512 (C.45:12B-18).