Cal. Health and Safety Code § 1367.18

(a) Every health care service plan, except a specialized health care service plan, that covers hospital, medical, or surgical expenses on a group basis shall offer coverage for orthotic and prosthetic devices and services under the terms and conditions that may be agreed upon between the group subscriber and the plan. Every plan shall communicate the availability of that coverage to all group contractholders and to all prospective group contractholders with whom they are negotiating. Any coverage for prosthetic devices shall include original and replacement devices, as prescribed by a physician and surgeon or doctor of podiatric medicine acting within the scope of his or her license. Any coverage for orthotic devices shall provide for coverage when the device, including original and replacement devices, is prescribed by a physician and surgeon or doctor of podiatric medicine acting within the scope of his or her license, or is ordered by a licensed health care provider acting within the scope of his or her license. Every plan shall have the right to conduct a utilization review to determine medical necessity prior to authorizing these services. (b) Notwithstanding subdivision (a), on and after July 1, 2007, the amount of the benefit for orthotic and prosthetic devices and services shall be no less than the annual and lifetime benefit maximums applicable to the basic health care services required to be provided under Section 1367. If the contract does not include any annual or lifetime benefit maximums applicable to basic health care services, the amount of the benefit for orthotic and prosthetic devices and services shall not be subject to an annual or lifetime maximum benefit level. Any copayment, coinsurance, deductible, and maximum out-of-pocket amount applied to the benefit for orthotic and prosthetic devices and services shall be no more than the most common amounts applied to the basic health care services required to be provided under Section 1367.