What important aspect does a doctor's referral specifically address?

The correct option highlights that a doctor's referral specifically addresses medical service details and cost. When a healthcare provider makes a referral, they are typically guiding a patient to another specialist or facility that can offer the necessary medical services. This process often includes information about what specific services the patient needs, the expertise required, and possibly the pricing associated with those services.

Referrals play a crucial role in ensuring that the patient receives appropriate care tailored to their medical needs. They also help in maintaining continuity of care, as the referring doctor usually provides relevant background information about the patient's condition to ensure the receiving provider is well-informed.

In contrast, while the other choices touch on relevant aspects of a patient's overall medical context, they do not directly relate to the primary function of a referral. For instance, patient insurance details pertain to coverage and financial aspects but are not typically addressed by the referral itself. Similarly, the qualifications of the healthcare provider and the patient's previous medical history may inform the referral process, but they are not the specific focus of what a referral is intended to accomplish.