Samantha takes her grandmother to the doctor. The receptionist asks Samantha for her grandmother's proof of insurance. Samantha's grandmother gives her two cards. The receptionist asks which insurer should be billed first for the health care services. This scenario is an example of which type of cost sharing? investment coinsurance copayment deductible

In this scenario, the situation described involves determining which insurer should be billed first for health care services. This is related to how health insurance plans coordinate benefits when a patient has multiple insurance policies. The correct answer to this question is **coinsurance**. Here's a brief explanation of the terms for clarity: 1. **Investment**: This typically refers to putting money into something for potential future returns, not applicable in this context. 2. **Coinsurance**: This is a cost-sharing arrangement where the insured pays a certain percentage of the costs of covered services after the deductible has been met. In this case, it relates to how costs are shared between multiple insurers. 3. **Copayment**: This is a fixed amount that the insured pays for a specific service at the time of receiving care, not directly related to which insurer is billed first. 4. **Deductible**: This is the amount the insured must pay out-of-pocket before the insurance starts to pay. It does not pertain to the order of billing between insurers. Thus, the scenario illustrates **coinsurance** as it involves the coordination of benefits between two insurance providers.