What is the test for producing certified copies of a plaintiff's medical plan?

Appellants argue that respondent "failed to produce certified copies [of the plan documents] pursuant to California Evidence Code 1530." When appellants raised this issue below, the trial court responded, "[T]hese are plans being produced by . . . a state agency, so that the presumption of [Evidence Code section] 1530 applies and a certified copy would not be required." Appellants have not presented any legal argument showing that the trial court erred. "We therefore deem any claim of error forfeited. [Citations.]" (Mendez v. Mid-Wilshire Health Care Center. (2013) 220 Cal.App.4th 534, 547-548.)