Final answer:
The highest priority nursing diagnosis for a patient with a deep partial-thickness burn injury is Acute Pain.
Step-by-step explanation:
When prioritizing nursing diagnoses for a patient with a deep partial-thickness burn injury, the highest priority should be given to the nursing diagnosis of Acute Pain. This is because burn injuries are known to cause severe pain, which can have a significant impact on the patient's overall well-being and ability to recover. Managing and alleviating pain should be a top priority to ensure the patient's comfort and promote healing.