Final answer:
Some managed care contracts require referrals to be made solely to in-network providers.
Step-by-step explanation:
In managed care contracts, some require referrals to be made solely to **in-network** providers. In-network providers are healthcare providers that have a contract with a specific insurance company or health plan to provide services at agreed-upon rates. When a patient seeks a specialist or a specific medical service, they typically need a referral from their primary care physician or insurance company before seeing an out-of-network provider.