Pre-existing Conditions Protection Act of 2021 This bill reestablishes requirements for private health insurance plans with respect to preexisting conditions, guaranteed enrollment, and discrimination based on health-related factors if they are repealed by another law. In such event, the bill prohibits private health insurance plans from (1) limiting or excluding benefits covering preexisting conditions; (2) denying enrollment to employers or individual applicants, subject to specified limits; (3) establishing rules for eligibility based on an individual's health status; or (4) requiring an individual to a pay higher premium than similarly situated individuals enrolled in the plan based the individual's health status. The bill also prohibits plans from collecting genetic information in connection with issuing health insurance and provides requirements for workplace wellness programs connected to health insurance.