This is the amount you pay as your share of the cost for a medical service or supply, like a doctor's visit, hospital outpatient visit, or prescription drug. A copayment is usually a set amount, rather than a percentage. For example, you might pay $10 or $20 for a doctor's visit or prescription drug.
Origin of the term used within this page: https://data.cms.gov/
Short Term Medical Insurance
Limited Fixed Indemnity Plans