Final answer:
The priority behavior for the nurse to report to the treatment team regarding a client with bipolar disorder is elevated mood and grandiosity.
Step-by-step explanation:
The priority behavior for the nurse to report to the treatment team regarding a client with bipolar disorder is elevated mood and grandiosity.
Elevated mood and grandiosity are key symptoms of a manic episode in bipolar disorder. This behavior can indicate an increased risk of impulsive and potentially harmful actions, making it important for the treatment team to be aware and intervene accordingly.
In contrast, increased appetite, decreased need for sleep, and decreased psychomotor activity are also common symptoms of bipolar disorder, but they are not as immediate of a concern as the elevated mood and grandiosity.