You seem to have a lot of knowledge about the healthcare system, that's great! However, if your answer is too wordy, it can tire out the interviewer, and they will eventually stop reading. Try to keep your answer at 2-3 sentences max. You discussed a couple of points; 1. basis of reimbursement, 2. cost of medication, 3. decision making for procedures, 4. the effect on hospitals. Hone in on one point so you can answer the question with focus. Lastly, in the second sentence, you used the word shortcut "knw". Although this is ok for informal texting, be sure to write out all your words to keep it professional.