All of these are costs associated with health insurance EXCEPT:

Mileage is not a cost associated with health insurance. The primary expenses related to health insurance typically include premiums, deductibles, and copayments.

Premiums are the regular payments made to maintain health insurance coverage. Deductibles represent the amount an insured person must pay out-of-pocket for healthcare before their insurance starts to contribute. Copayments are fixed fees that insured individuals pay for specific medical services at the time of receiving care, such as a doctor's visit or prescription medication.

In contrast, mileage pertains to travel expenses incurred when visiting healthcare providers, and while it can be a financial consideration for patients, it is not a cost that forms part of the health insurance structure itself.