Final answer:
The nurse is acting as a Case Manager, as they coordinate various services and care for a client with diabetes after hospital discharge.
Step-by-step explanation:
The nurse in this scenario is assuming the role of a Case Manager. This is because the nurse is coordinating comprehensive care for the adult client, including arranging home visits from aides and therapists to ensure that the client's healthcare needs are met after being discharged from the hospital due to complications of diabetes mellitus. The role extends beyond education or health promotion to include organizing the variety of services required by the client, such as dressing changes, helping with activities of daily living, and providing diabetes education.