Final answer:
For a follow-up consultation in a nursing facility where the patient's test results were not available at the time of the last visit, the correct billing code is 99307. This code is used for subsequent care when test results necessitate further consultation and potential changes to a patient's care plan.
Step-by-step explanation:
The question is asking which code should be used for billing a follow-up consultation in a nursing facility where the consultation is performed due to test results that were not available during the last visit. The correct code to assign for such a follow-up consultation visit in a nursing facility is A. 99307. This code is specifically for subsequent nursing facility care, which is often required when a patient has ongoing diagnostic workups or when changes in their treatment plan are necessary.
If a follow-up consultation is performed in a nursing facility because certain test results were not available at the time of the last visit, the appropriate visit code to assign would be 99307.