Hospital ratings seem like exactly what you need — a clear measure of quality to help you choose where to get treated. But the reality is more complex. Ratings measure specific things, and knowing what they actually measure (and what they don't) is essential to using them properly.
CQC ratings explained
The Care Quality Commission (the organisation that inspects NHS and private hospitals) rates providers on five areas: safety, effectiveness, caring, responsiveness, and leadership. An "Outstanding" hospital has passed rigorous inspection across all of these.
What CQC ratings show: whether the hospital has solid systems, safety processes, and good patient experience. What they don't show: whether the specific team treating your specific condition is excellent. A "Good" rated hospital can have an outstanding heart surgery department — or a weak one.
Specific surgeon outcomes
Some specialties publish individual surgeon outcomes: heart surgery death rates, joint replacement revision rates (how often the surgery needs redoing), weight loss surgery results. This data is more specific and more relevant to your decision than hospital-level ratings.
One important note: surgeons who take the most complex, high-risk cases will statistically have higher complication rates. A higher complication rate might mean a better surgeon who doesn't turn down difficult cases.
How to actually use this information
Start with the specific procedure you need. Find published outcome data for that specific procedure, not the hospital in general. Compare surgeon volumes and outcomes where you can. Consider your case's complexity — if your case is straightforward, a busy general centre works; if your case is complex, you need the specialist with the most experience with exactly your situation.
Ratings are where you start, not where you finish. The real value is understanding what the numbers mean for your specific situation. More on choosing the right surgeon.