Final answer:
For documentation of medical necessity, a justification, explanation, or reason for which the test is being performed must be included in an order.
Step-by-step explanation:
In order to provide documentation of medical necessity, a justification, explanation, or reason for which the test is being performed must be included in an order. This means that a healthcare provider needs to provide a logical explanation or reason for why the test is needed.
For example, if a patient is experiencing chest pain, the healthcare provider may order a cardiac stress test to determine if there are any issues with the heart. In this case, the justification for the test would be the symptom of chest pain.
Therefore, option A, justification, explanation, reason is the correct answer.