Final answer:
The most accurate nursing diagnosis for a patient refusing to participate in stoma care after ileal conduit surgery is Disturbed body image related to change in body function.
Step-by-step explanation:
The nursing diagnosis that fits the patient's behavior of refusing to look at the stoma or participate in care, and insisting that only ostomy nurse specialists can provide care for the stoma after an ileal conduit surgery, is most likely Disturbed body image related to change in body function. This diagnosis reflects the patient's psychological response to the physical change resulting from surgery. It is important for the healthcare team to acknowledge the patient's feelings, provide support, and encourage gradual involvement in self-care to promote adjustment and acceptance of the new body function.