California Code, Insurance Code - INS § 10127.19

(a) Commencing March 1, 2013, and at least annually thereafter, a health insurer, not including a health insurer offering specialized health insurance policies, shall provide to the department, in a form and manner determined by the department in consultation with the Department of Managed Health Care, the number of covered lives, by product type, as of December 31 of the prior year, that receive health care coverage under a health insurance policy that covers individuals and small groups inside and outside of the California Health Benefit Exchange, large groups, administrative services only business lines, and any other business lines.  Health insurers shall include the unduplicated enrollment data in specific product types as determined by the department, including, but not limited to, HMO, point-of-service, PPO, grandfathered, and Medi-Cal managed care.  Data reported pursuant to this subdivision shall specify the covered persons that are being reported pursuant to subdivision (b).

(b) Commencing March 1, 2020, and at least annually thereafter, information specific to a multiple employer welfare arrangement (MEWA) shall be provided to the department, in a form and manner determined by the department in consultation with the Department of Managed Health Care, as follows:

(c) The department shall publicly report the data provided by each health insurer and MEWA pursuant to this section, including, but not limited to, posting the data on the department's internet website.  The department shall consult with the Department of Managed Health Care to ensure that the data reported is comparable and consistent, does not duplicate existing reporting requirements, and utilizes existing reporting formats.  The data for the previous calendar year shall be made available no later than April 15 of each calendar year.