Final answer:
Diabetes mellitus is a risk factor for the development of pyelonephritis.
Step-by-step explanation:
The nurse should identify diabetes mellitus as a risk factor for the development of pyelonephritis. Pyelonephritis is an inflammation of the kidney that can be caused by bacteria from other parts of the urinary tract, such as the bladder. Diabetes mellitus can impair the immune system's ability to fight off infections, making individuals with diabetes more susceptible to pyelonephritis.