I'd recommend 'Healing Hearts'. This novel focuses on the relationship between a physical therapist and a patient who she helps recover. The romance develops slowly as the patient heals, and the medical elements are presented in an accessible way. It gives a good feel for what medical play romance novels are like.
You might like 'Medical Hearts Entwined'. It's about a cardiologist and a medical researcher. The story has a lot of heart - warming moments and the medical details are explained in a way that's understandable for those new to the genre. It's a great introduction to the world of medical play romance novels.