Final answer:
An external referral is used when referring a patient to a healthcare provider outside the practice. It is distinct from internal, specialist, and urgent referrals.
Step-by-step explanation:
If the provider you are referring to is outside the practice, you would select B) External Referral. An external referral is when a primary care provider or a specialist sends a patient to another healthcare provider or specialist that is not within the same practice or organization for further evaluation or treatment. This is different from an internal referral, which is when a patient is sent to another provider within the same practice or healthcare system. A specialist referral is a type of external referral but specifically to a healthcare provider who focuses on a specific field of medicine. An urgent referral is one that is time-sensitive and requires prompt attention, but it can be either internal or external depending on the circumstances.