Final answer:
D. Precertification is the process that verifies the coverage, medical necessity, and medical appropriateness of a service under a patient's insurance policy.
Step-by-step explanation:
The process that indicates that a patient's insurance company has verified a service is covered by the patient's policy, reviewed the medical necessity for the service, and agreed that it is medically appropriate is called Precertification.
Precertification is a procedure in which the insurance company requires the provider to obtain approval before providing certain medical services. This is done to ensure that the treatment is necessary and covered under the patient's policy.