NHS hospital ratings are published to help patients choose. The Care Quality Commission (CQC) rates hospitals as Outstanding, Good, Requires Improvement, or Inadequate. But what these ratings actually tell you about your specific procedure is often unclear.
What CQC ratings measure
CQC ratings assess safety, effectiveness, responsiveness, caring, and leadership. They're based on inspection visits, patient feedback, incident reporting data, and staff surveys. The ratings apply to the whole trust (hospital group), not individual departments.
A hospital rated Good overall might have an Inadequate intensive care unit. The overall rating reflects the aggregate, which can hide departmental variation. CQC reports drill into specific areas, so look there for your speciality.
The ratings are not procedure-specific. A hospital might be Good overall but have variable outcomes for your particular operation. Hip replacement outcomes might be excellent while colorectal surgery is average.
Beyond the CQC rating: actual outcome data
Hospital Episode Statistics (HES) data is published by NHS Digital and shows mortality, readmission rates, and length of stay by procedure. For common operations (hip/knee replacement, cataract surgery, heart surgery), this data exists and varies significantly between hospitals.
Getting Fit for Surgery publishes real outcome data for orthopaedic procedures—mortality, infection rates, length of stay, readmission rates. Compare hospitals on these metrics rather than relying on CQC ratings alone.
Heart surgery outcomes are published by cardiac networks. Stroke network data is available. For these high-stakes procedures, outcome variation is real and substantial. A hospital's surgical mortality rate for coronary bypass might be 1.5% at one centre and 3.5% at another—that difference matters.
Cancer outcomes are reported by cancer networks. Five-year survival after cancer surgery varies by centre, and some of that is the surgeon's skill and case selection. For cancer, asking about individual surgeon outcomes, not just hospital ratings, is justified.
The limitations of published data
Case-mix adjustment attempts to account for patient differences, but doesn't always work well. If one hospital serves an older, sicker population, their unadjusted mortality rates look worse even if the surgery itself is equally good. Published data try to correct this, but the adjustment is imperfect.
Outcome data is published with delay—usually 2-3 years behind. A hospital's performance last year is not necessarily their current performance. Changes in leadership, staff, or systems can improve or worsen outcomes.
Sample size matters. Small hospitals or those with fewer of a particular procedure have high random variation in their outcome statistics. A "worse" outcome rate might just be statistical noise. Look at the confidence intervals, not just the point estimate.
Hospital choice in practice
If you're on the NHS waiting list, you often can't easily choose. Waiting times vary by hospital, so you might be offered a choice of locations and dates—shorter waits but possibly at a hospital 50 miles away.
If you're planning private treatment, you can choose more freely. Ask directly: What are your outcomes for this procedure? Good surgeons know their numbers. Request mortality and complication rates, infection rates, and patient satisfaction.
For NHS treatment, asking your GP or consultant: "Which hospital would you recommend for this?" is valuable. They know local quality variations that public data doesn't capture. Word-of-mouth from clinicians matters.
What to ask about your hospital and surgeon
Ask: How many of this procedure does your team do per year? Volume correlates with outcomes for complex procedures. Surgeons doing 50+ hip replacements per year have better outcomes than those doing 5-10.
Ask about specific complication rates: infection, DVT, readmission, need for re-operation. Not just "good outcomes" but actual percentages. If your surgeon won't provide this, find another surgeon.
Ask about their training and experience. A surgeon who's done 500 hip replacements has different expertise than one who's done 50. Higher volume generally predicts better results.