Final answer:
The first party in this healthcare reimbursement scenario is the health insurance.
Step-by-step explanation:
The first party in this healthcare reimbursement scenario is the health insurance. In this case, the patient's parents have health insurance through the mother's employment at the State Department of Treasury. The health insurance is responsible for covering the cost of the medical services, including the prescription of prednisone for the patient's sore throat and difficulty swallowing.