What does the self-funded part of social security mean?

Out-of-pocket is the out-of-pocket part within the scope of medical insurance reimbursement, including the amount below deductible and the individual out-of-pocket part after medical insurance reimbursement above deductible.

Full out-of-pocket payment is a self-funded part, which is not covered by medical insurance reimbursement.

Social insurance is a social and economic system that provides income or compensation for those who lose their ability to work, are temporarily unemployed or suffer losses due to health reasons. The main items of social insurance include endowment insurance, medical insurance, unemployment insurance, industrial injury insurance and maternity insurance.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.