Legal Question in Health Care Law in California

Medical institutions have always required you to sign paperwork to become a patient; it just used to all be on paper. The only thing that has changed is it's online, and there have been laws making e-signatures the same as ink signatures for many years now. Any particular provision of the agreement may or may not be enforceable, but that would require a review of the entire document. Requiring you to sign it, and abide by any provisions that are enforceable (which is probably but not certainly all of them) is perfectly legal.