Ins. Code, § 10112.25

(a) A health insurer that issues, sells, renews, or offers health insurance policies for health care coverage in this state, including a grandfathered health plan, but not including specialized health insurance policies that provide only dental or vision services, shall provide an annual rebate to each insured under that coverage, on a pro rata basis, if the ratio of the amount of premium revenue expended by the health insurer on the costs for reimbursement for clinical services provided to insureds under that coverage and for activities that improve health care quality to the total amount of premium revenue, excluding federal and state taxes and licensing or regulatory fees and after accounting for payments or receipts for risk adjustment, risk corridors, and reinsurance, is less than the following:

(1) With respect to a health insurer offering coverage in the large group market, 85 percent.

(2) With respect to a health insurer offering coverage in the small group market or in the individual market, 80 percent.

(b) A health insurer that issues, sells, renews, or offers health insurance policies for health care coverage in this state, including a grandfathered health plan, shall comply with the following minimum medical loss ratios:

(1) With respect to a health insurer offering coverage in the large group market, 85 percent.

(2) With respect to a health insurer offering coverage in the small group market or in the individual market, 80 percent.

(c) (1) The total amount of an annual rebate required under this section shall be calculated in an amount equal to the product of the following:

(A) The amount by which the percentage described in paragraph (1) or (2) of subdivision (a) exceeds the ratio described in paragraph (1) or (2) of subdivision (a).

(B) The total amount of premium revenue, excluding federal and state taxes and licensing or regulatory fees and after accounting for payments or receipts for risk adjustment, risk corridors, and reinsurance.

(2) A health insurer shall provide a rebate owing to an insured no later than September 30 of the calendar year following the year for which the ratio described in subdivision (a) was calculated.

(d) The commissioner may adopt regulations in accordance with the Administrative Procedure Act (Chapter 3.5 (commencing with Section 11340) of Part 1 of Division 3 of Title 2 of the Government Code) that are necessary to implement the medical loss ratio as described under Section 2718 of the federal Public Health Service Act (42 U.S.C. Sec. 300gg-18), and any federal rules or regulations issued under that section.

(e) The requirements of this section shall be implemented as described in Section 2791 of the federal Public Health Service Act (42 U.S.C. Sec. 300gg-91) and the requirements of Section 2718 of the federal Public Health Service Act (42 U.S.C. Sec. 300gg-18) and any rules or regulations issued under those sections as in effect on January 1, 2017.

(f) This section does not apply to a health care service plan contract or insurance policy issued, sold, renewed, or offered for health care services or coverage provided in the Medi-Cal program (Chapter 7 (commencing with Section 14000) of Part 3 of Division 9 of the Welfare and Institutions Code).