This video explains the concept of coinsurance in health insurance and its origin:

• The prefix "C-O" seen before words like co-worker or co-operate comes from a Latin word meaning "with" or "together.", so "co-insurance" literally means "with the insurance company."

• After you've paid your deductible, coinsurance refers to the portion of healthcare costs that you share with your insurance company, typically with the insurance company covering the larger percentage.

• Here’s an example: if your insurance plan has 25% coinsurance, it means that after meeting your deductible, you pay 25% of healthcare costs, and your insurance company pays the remaining 75% until you reach your out-of-pocket maximum.