Final answer:
The hospital is at the refreezing stage of Lewin's change model, where changes such as interdisciplinary walking rounds and huddles are made a standard part of practice and sustained over time.
Step-by-step explanation:
In the scenario provided, the hospital is at the stage of refreezing in Lewin's change model. This is because after the initial unfreeze stage, where the need for change was recognized due to lower patient satisfaction scores, and the move stage, where changes were implemented such as interdisciplinary walking rounds and 'huddles', the hospital is ensuring that these changes are sustained over time. The refreezing stage involves integrating the changes into the organization by making sure they become standard practice — in this case, by conducting random visits to ensure nurse participation and by interviewing patients for their involvement. Consistency and buy-in are crucial during this phase to build trust and maintain the changes.