Why Heart Surgery Hospital Rankings Matter More Than You Think
When you or someone you love needs cardiac surgery, one of the most consequential decisions you will make has nothing to do with the operation itself. It is where that operation takes place.
This is not about prestige or name recognition. It is about survival, complication rates, and long-term outcomes. The data on this point is unambiguous: the hospital and surgical team you choose can meaningfully change your odds.
A landmark study published in The New England Journal of Medicine demonstrated that operative mortality for coronary artery bypass grafting (CABG) varied by a factor of three or more between the highest- and lowest-performing hospitals — even after adjusting for patient risk. Similar disparities exist for valve surgery, aortic surgery, and virtually every complex cardiac procedure. According to the Society of Thoracic Surgeons (STS), the difference between a one-star and a three-star program can translate into measurably different rates of death, stroke, kidney failure, prolonged ventilation, and reoperation.
Yet most patients choose their hospital based on proximity, insurance networks, or a primary care physician's default referral. These are understandable factors, but they should not be the only ones. You deserve to make this decision with your eyes open.
In this article, I want to walk you through exactly how to evaluate cardiac surgery hospital quality — the same way I would if you were sitting across from me in my office.
Understanding STS Star Ratings: The Gold Standard for Cardiac Surgery Quality
If you only learn one quality metric, make it this one. The STS star rating system is the most rigorous, procedure-specific quality benchmark in cardiac surgery today.
Here is how it works. The Society of Thoracic Surgeons maintains a national database — the STS Adult Cardiac Surgery Database — to which roughly 95% of cardiac surgery programs in the United States voluntarily submit detailed clinical data on every operation. The STS then calculates risk-adjusted outcomes for each participating program. "Risk-adjusted" means the analysis accounts for how sick the patients are, so a hospital that takes on the most complex cases is not unfairly penalized.
Programs receive a composite quality score based on multiple outcome domains:
- Operative mortality — Did the patient survive the hospitalization and the 30-day postoperative period?
- Major morbidity — Stroke, renal failure, prolonged ventilation, deep sternal wound infection, and reoperation
- Use of evidence-based medications — Such as beta-blockers and antiplatelet agents when indicated
Based on this composite, hospitals receive a rating of one star (below expected performance), two stars (as expected), or three stars (above expected performance). STS star rating hospitals with three stars represent the top tier of measurable quality.
A few critical points patients should know about these ratings:
- Star ratings are procedure-specific. A hospital may earn three stars for isolated CABG but only two stars for aortic valve replacement. Always check the rating for your specific procedure.
- Ratings are updated periodically. Check the most recent reporting period.
- Not every hospital publicly reports its star rating. If a program will not share its STS star rating with you, that itself is information worth considering.
You can ask any cardiac surgery program directly: "What is your current STS star rating for this procedure?" A confident, high-quality program will answer without hesitation.
Where to Find STS Star Rating Data
The STS publishes a public reporting portal where participating programs that have opted into public reporting can be searched by procedure and location. The Consumer Reports heart surgery ratings also draw on STS data. While not every program participates in public reporting, these are strong starting points for your research.
Beyond Star Ratings: Other Ways to Identify the Best Cardiac Surgery Centers
STS star ratings are the single best metric, but they are not the only thing that matters. Here are additional factors I recommend patients evaluate:
Surgical Volume
Decades of research consistently show that higher-volume hospitals and higher-volume surgeons produce better outcomes for complex cardiac procedures. This relationship — sometimes called the volume-outcome relationship — has been demonstrated for CABG, valve surgery, aortic surgery, and mechanical circulatory support.
The numbers matter. For CABG, programs performing fewer than 100 cases per year have been associated with higher mortality in multiple studies. For mitral valve repair, surgeon-specific volume is especially important. ACC/AHA guidelines recommend that mitral valve repair be performed by surgeons who achieve repair rates above 95% and operate at experienced centers. If a surgeon is performing only a handful of a given procedure each year, the statistics are not in your favor — regardless of that surgeon's other qualities.
Ask directly: "How many of these specific operations does your surgeon perform annually? And how many does this hospital perform?"
Repair Rates for Valve Surgery
If you are facing mitral valve disease, one of the most telling quality indicators is the program's mitral valve repair rate. At the best cardiac surgery centers, repair rates for degenerative mitral regurgitation should exceed 95%. Some high-volume centers report rates above 99%. If a program is quoting you a repair rate of 50-60%, that is a red flag — and a strong reason to seek another opinion.
Multidisciplinary Heart Teams
Modern cardiac care demands collaboration. Guideline-directed evaluation of complex cases — particularly aortic stenosis (TAVR vs. SAVR), coronary artery disease (CABG vs. PCI), and heart failure — requires a multidisciplinary heart team that includes cardiac surgeons, interventional cardiologists, imaging specialists, and anesthesiologists. Programs that operate with this team-based model tend to make better-informed decisions about which patients benefit from surgery, which benefit from catheter-based intervention, and which are best served by medical therapy alone.
Transparency and Willingness to Share Data
A high-quality program will be transparent about its outcomes. If a hospital or surgeon becomes evasive when you ask about mortality rates, complication rates, or STS performance, consider that a warning sign. You have every right to this information. Your life is at stake.
What Heart Surgery Hospital Rankings Like U.S. News Actually Measure
Many patients come to me referencing U.S. News & World Report heart surgery hospital rankings. These rankings have enormous public visibility, but it is important to understand what they actually reflect — and what they do not.
The U.S. News methodology combines several components:
- Risk-adjusted outcomes (survival, patient safety indicators)
- Patient experience scores (HCAHPS surveys)
- Volume
- Expert reputation surveys — in which board-certified physicians nominate hospitals they consider best
- Advanced clinical capabilities — availability of technologies, specialized services
The reputation survey component has been criticized by some in the medical community because it tends to favor large, well-known academic medical centers regardless of measured outcomes. A community hospital with exceptional STS three-star ratings may rank lower than a famous academic center with only average outcomes simply because fewer physicians nominated it in a survey.
My advice: use U.S. News rankings as one data point, but do not treat them as definitive. STS star ratings are a more direct and procedure-specific measure of surgical quality. If there is a discrepancy between a program's U.S. News rank and its STS star rating, I would weight the STS data more heavily.
Other rankings and quality designations worth knowing about include:
- CMS (Medicare) Hospital Compare — Publicly reported outcomes for cardiac surgery and other procedures
- Leapfrog Hospital Safety Grades — Focused on patient safety metrics, including infection rates and error prevention
- State-level cardiac surgery report cards — States such as New York, Pennsylvania, New Jersey, and California publish risk-adjusted mortality data by hospital and, in some cases, by individual surgeon
Practical Steps: How to Choose the Right Hospital for Your Heart Surgery
Here is a concrete checklist you can use when evaluating where to have your cardiac surgery:
- Ask for the program's STS star rating for your specific procedure. Three stars is the top tier.
- Ask about surgical volume — both the hospital's and the individual surgeon's — for your specific operation.
- Ask about specific outcome metrics: operative mortality, stroke rate, infection rate, and (for valve surgery) repair rate.
- Check publicly available data: STS public reporting, state report cards, CMS Hospital Compare.
- Confirm the hospital uses a multidisciplinary heart team for surgical decision-making.
- Ask whether your case will be discussed in a heart team conference before surgery is scheduled.
- Get a second opinion, especially if the proposed operation is complex, if you are high-risk, or if anything about the recommendation feels uncertain.
Use our free cardiac surgery risk calculator to understand your individual risk profile before you meet with surgical teams. Knowing your estimated risk empowers you to have a more informed conversation and to compare what different programs are telling you.
When the "Best" Hospital Is Not the Closest Hospital
I understand the practical reality: not everyone lives near a top cardiac surgery center. Travel is disruptive. It is expensive. It requires support systems.
But here is the clinical reality: for high-risk or complex operations — redo sternotomies, complex multi-valve procedures, aortic root replacements, reoperative surgery — the difference between a high-volume center and a low-volume one can be the difference between a successful outcome and a devastating complication. For straightforward, lower-risk procedures at a solid two- or three-star program near your home, proximity may be entirely reasonable.
The key is knowing which category your situation falls into. That is exactly the kind of question a cardiac surgery second opinion can answer.
When to Seek a Second Opinion on Hospital and Surgeon Selection
If any of the following apply to you, a second opinion is not just reasonable — it is prudent:
- You have been told you need surgery but have not been given clear data on your hospital's outcomes for that procedure.
- You are a higher-risk patient (advanced age, prior cardiac surgery, multiple comorbidities) and want to confirm the plan is optimized.
- The proposed surgery is complex — multi-valve, aortic root, redo operation, or combined procedures.
- You are unsure whether surgery is necessary at all, or whether a less invasive option might be appropriate.
- You want an independent, expert review of your imaging, catheterization data, and risk profile.
At WhiteGloveMD, we review your complete medical records, operative recommendations, and imaging studies. We provide a detailed, written assessment of your case — including whether the proposed surgery is appropriate, whether the surgical plan is optimal, and whether your clinical situation warrants evaluation at a specialized center. Learn more about how our process works.
If you are facing a cardiac surgery recommendation and want to be confident you are making the best decision — about the procedure, the timing, and the hospital — a WhiteGloveMD second opinion can help. Our reviews are conducted by a board-certified cardiovascular surgeon using AI-enhanced analysis, delivered within days, and designed to give you clarity when the stakes are highest.