CMS certification 260020
Mercy Hospital St Louis
615 New Ballas Road, Saint Louis, MO 63141
Mercy Hospital St Louis has a CMS overall rating of 4 out of 5 stars. 78% of patients who answered CMS's national survey would definitely recommend it, against a US average of 71%. Of the 27 death, complication, infection and readmission measures CMS could compare, it does better than the nation on 7 and worse on 1. Emergency patients spend a median of 3 h 40 min in its emergency department before leaving (US median 2 h 42 min).
Every figure on this page is published by CMS; we arrange and explain it, and score nothing ourselves.
What patients said
Answers from patients who stayed here, collected by CMS in the national HCAHPS survey: 1,572 completed surveys, 18% response rate, Oct 2024 – Sep 2025.
Emergency department
How long emergency patients spent here and how some time-critical care went, from CMS's timely and effective care measures, Oct 2024 – Sep 2025. CMS classes this emergency department's patient volume as very high; busier departments tend to have longer times, so the national median for departments of the same volume is shown too. These are medians over a year of visits, not a live wait time.
| Measure | This hospital | MO | US |
|---|---|---|---|
| Median time in the emergency department before leaving Lower is better · 414 visits sampled · US median for EDs of the same volume: 3 h 21 min | 3 h 40 min | 2 h 35 min | 2 h 42 min |
| Median time for psychiatric and mental health patients Lower is better · 39 visits sampled | 3 h 53 min | 4 h 23 min | 4 h 17 min |
| Left before being seen Lower is better · 101,472 patients | 4% | 3% | 2% |
| Stroke symptoms: brain scan read within 45 minutes Higher is better · 12 patients | 67% | 74% | 69% |
| Severe sepsis and septic shock: all recommended care given Higher is better · 294 patients | 74% | 63% | 65% |
How Mercy Hospital St Louis compares with nearby hospitals
The closest hospitals of the same kind that CMS rates or surveys - the same city first, then the same county and ZIP area. Every figure is CMS's: the overall star rating, the share of patients who would definitely recommend the hospital, the median time emergency patients spent before leaving, and how many death, complication, infection and readmission measures CMS found better or worse than the national rate.
| Hospital | CMS stars | Would recommend | ER median time | Vs the nation |
|---|---|---|---|---|
| Mercy Hospital St LouisThis hospital | 4/5 | 78% | 3 h 40 min | 7 better 1 worse |
| Christian Hospital NortheastSame city | 4/5 | 66% | 3 h 37 min | 2 better 2 worse |
| Missouri Baptist Medical CenterSame city | 5/5 | 81% | 4 h 22 min | 8 better 1 worse |
| Mercy Hospital SouthSame city | 2/5 | 65% | 4 h 14 min | 1 better 1 worse |
| SSM Health St Mary's Hospital - St LouisSame city | 3/5 | 63% | 2 h 46 min | 3 better 2 worse |
| Barnes Jewish HospitalSame city | 4/5 | 79% | 4 h 37 min | 4 better 2 worse |
Hospitals differ in size and in how sick their patients are. CMS adjusts its outcome measures for that, but a star or a percentage is a starting point for questions, not a verdict. All hospitals in Saint Louis.
Deaths
How many patients died within 30 days of admission, adjusted by CMS for how sick they were. Lower is better. Data from Jul 2022 – Jun 2025.
| Measure | CMS comparison | This hospital | National |
|---|---|---|---|
| All patients, hospital-wide 7,505 cases | Too few cases | 2.7% | 3.9% |
| Heart attack 149 cases | Too few cases | 11.8% | 11.9% |
| Heart failure 757 cases | Too few cases | 7.7% | 11.1% |
| Pneumonia 729 cases | Too few cases | 11.8% | 15.2% |
| Stroke 673 cases | Too few cases | 9.3% | 11.9% |
| COPD 142 cases | Too few cases | 8.8% | 8.6% |
| Heart bypass surgery (CABG) 164 cases | Too few cases | 3.1% | 2.4% |
Complications
How often patients had serious complications, most of them after surgery, adjusted for how sick they were. Lower is better. Data from Jul 2022 – Jun 2024.
| Measure | CMS comparison | This hospital | National |
|---|---|---|---|
| Serious complications, combined measure | No different | 0.89 likely 0.67 – 1.1 | 1 |
| After hip or knee replacement 204 cases | Too few cases | 2.7% | 4.1% |
| Deaths after a serious but treatable surgical complication 189 cases | No different | 200.35 per 1,000 likely 161.73 per 1,000 – 238.97 per 1,000 | 173.3 per 1,000 |
| Pressure ulcers (bed sores) 11,307 cases | No different | 0.22 per 1,000 likely 0 per 1,000 – 0.65 per 1,000 | 0.63 per 1,000 |
| Collapsed lung caused by a procedure 13,288 cases | No different | 0.2 per 1,000 likely 0.02 per 1,000 – 0.38 per 1,000 | 0.21 per 1,000 |
| Broken bones from falls in the hospital 13,264 cases | No different | 0.3 per 1,000 likely 0.13 per 1,000 – 0.47 per 1,000 | 0.27 per 1,000 |
| Bleeding or hematoma after surgery 3,250 cases | No different | 2.62 per 1,000 likely 1.44 per 1,000 – 3.79 per 1,000 | 2.34 per 1,000 |
| Kidney injury needing dialysis after surgery 1,445 cases | No different | 1.21 per 1,000 likely 0 per 1,000 – 2.51 per 1,000 | 1.67 per 1,000 |
| Breathing failure after surgery 1,390 cases | No different | 9.34 per 1,000 likely 5.06 per 1,000 – 13.62 per 1,000 | 9.42 per 1,000 |
| Blood clots in the lungs or legs after surgery 3,378 cases | No different | 5.04 per 1,000 likely 3.44 per 1,000 – 6.63 per 1,000 | 3.52 per 1,000 |
| Sepsis after surgery 1,398 cases | No different | 4.35 per 1,000 likely 1.76 per 1,000 – 6.94 per 1,000 | 5.27 per 1,000 |
| Surgical wound splitting open 740 cases | No different | 1.93 per 1,000 likely 0.57 per 1,000 – 3.29 per 1,000 | 1.77 per 1,000 |
| Accidental cut or tear during abdominal surgery 2,173 cases | No different | 0.58 per 1,000 likely 0 per 1,000 – 1.39 per 1,000 | 1.06 per 1,000 |
Infections caught in the hospital
Standardized infection ratio: 1.0 means as many infections as CMS predicted for a hospital like this one. Lower is better. Data from Oct 2024 – Sep 2025.
| Measure | CMS comparison | This hospital | National |
|---|---|---|---|
| Bloodstream infections from central lines (CLABSI) | Better | 0.31 likely 0.15 – 0.57 | 1 |
| Urinary tract infections from catheters (CAUTI) | Better | 0.56 likely 0.31 – 0.94 | 1 |
| Surgical site infections after colon surgery | No different | 0.83 likely 0.47 – 1.36 | 1 |
| Surgical site infections after abdominal hysterectomy | No different | 0.5 likely 0.08 – 1.65 | 1 |
| MRSA bloodstream infections | No different | 0.86 likely 0.5 – 1.38 | 1 |
| C. diff intestinal infections | Better | 0.17 likely 0.12 – 0.23 | 1 |
Readmissions and return visits
How often patients had to come back to a hospital after going home. Lower is better. Data from Jul 2023 – Jun 2025.
| Measure | CMS comparison | This hospital | National |
|---|---|---|---|
| Readmitted after a heart attack 290 cases | Too few cases | 16% | 14.4% |
| Readmitted after heart failure 1,517 cases | Too few cases | 23.7% | 21.3% |
| Readmitted after pneumonia 1,261 cases | Too few cases | 18.8% | 17.3% |
| Readmitted after COPD 288 cases | Too few cases | 20.1% | 20% |
| Readmitted after heart bypass surgery 245 cases | Too few cases | 11.4% | 11% |
| Readmitted after hip or knee replacement 205 cases | Too few cases | 7.2% | 5.8% |
| Days back in hospital after a heart attack 158 cases | Too few cases | 22.6 days per 100 | — |
| Days back in hospital after heart failure 862 cases | Too few cases | 16.8 days per 100 | — |
| Days back in hospital after pneumonia 738 cases | Too few cases | 18.7 days per 100 | — |
| Unplanned visits after an outpatient colonoscopy 5,582 cases | No different | 11.4 per 1,000 likely 9.3 per 1,000 – 14 per 1,000 | 13 per 1,000 |
| Hospital admissions during outpatient chemotherapy 632 cases | No different | 11.9 per 100 likely 9.9 per 100 – 14.2 per 100 | 10.7 per 100 |
| ER visits during outpatient chemotherapy 632 cases | No different | 4.5 per 100 likely 3.4 per 100 – 6 per 100 | 5.4 per 100 |
| Unplanned visits after outpatient surgery 1,529 cases | No different | 0.9 likely 0.7 – 1.1 | — |
1 more measure had too few cases here to report.
Clinicians registered at this address
801 clinicians give this hospital's street address as their practice location in NPPES, the federal provider registry, plus 20 residents and trainees. The same address can take in offices and clinics in the building, and a listing does not prove admitting privileges or current employment.
| Specialty | Clinicians |
|---|---|
| Anesthesiologist Assistant | 121 |
| Internal Medicine | 87 |
| Anesthesiology | 61 |
| Nurse Anesthetist, Certified Registered | 55 |
| Diagnostic Radiology | 49 |
| Family | 30 |
| Obstetrics & Gynecology | 27 |
| Emergency Medicine | 25 |
| Physician Assistant | 24 |
| Pediatrics | 22 |
| Neonatal | 20 |
| Dietitian, Registered | 19 |
First 12 alphabetically
Money from drug and device companies
Drug and device makers have to report what they pay teaching hospitals to CMS's Open Payments program. At many teaching hospitals most of it is research funding, or royalties for inventions the hospital licensed to a company. A payment on its own does not show a conflict of interest.
- 2019 $345,422
- 2020 $361,757
- 2021 $300,517
- 2022 $92,874
- 2023 $133,090
- 2024 $378,368
- 2025 $229,781
What the 2025 general payments were for
| Type of payment | Amount | Payments |
|---|---|---|
| Medical devices and supplies on long-term loan | $100,419 | 10 |
| Space rental and facility fees | $4,595 | 4 |
| Speaking, teaching and other services | $825 | 3 |
| Debt forgiveness | $88 | 1 |
Largest paying companies, 2025
| Company | Amount | Payments |
|---|---|---|
| Prenosis Inc. | $121,229 | 16 |
| Intuitive Surgical, INC. | $91,200 | 8 |
| MED-EL Corporation | $9,090 | 1 |
| E.R. Squibb & Sons, L.L.C. | $2,625 | 1 |
| AstraZeneca Pharmaceuticals LP | $2,500 | 1 |
| Bayer Healthcare Pharmaceuticals Inc. | $1,500 | 1 |
| Pinnacle Biologics, Inc | $825 | 3 |
| Abbott Laboratories | $595 | 2 |
Largest research studies funded here, 2025
| Study | Amount |
|---|---|
| Connect MM: The Multiple Myeloma Disease Registry. The purpose of the Connect MM Registry is to explore the natural history and real world management… E.R. Squibb & Sons, L.L.C. | $2,625 |
Amounts are as the paying companies reported them to CMS; Open Payments data retrieved 13 Sep 2026. Full record on CMS Open Payments.
How to read this page
- Everything here is published by CMS on Care Compare. We arrange it and explain it; the star ratings and the better / worse verdicts are CMS's, not ours.
- “No different” is the most common result on most measures at most hospitals. CMS only calls a result better or worse when the difference from the national rate is statistically clear.
- Death, complication and readmission rates are adjusted by CMS for how sick patients were, so hospitals that treat sicker patients can be compared fairly.
- Infection results are ratios: 1.0 means as many infections as CMS predicted for a hospital like this one, below 1.0 is fewer.
- These are hospital-wide results. They do not rate an individual doctor, nurse or department, and they are not medical advice.
CMS Care Compare data retrieved 4 Oct 2026, refreshed weekly. Where this data comes from and how we handle it · Report an error
Common questions about Mercy Hospital St Louis
Is Mercy Hospital St Louis a good hospital?
Mercy Hospital St Louis has a CMS overall rating of 4 out of 5 stars. Of the 27 death, complication, infection and readmission measures CMS could compare, it does better than the nation on 7 and worse on 1. These are hospital-wide results published by CMS; they do not rate individual doctors or departments.
Would patients recommend Mercy Hospital St Louis?
78% of patients who answered CMS's national survey would definitely recommend it, against a US average of 71%. The figure comes from 1,572 completed HCAHPS surveys.
How long is the wait in the Mercy Hospital St Louis emergency room?
Emergency patients spend a median of 3 h 40 min in its emergency department before leaving (US median 2 h 42 min). Among US emergency departments with very high patient volume, like this one, the median is 3 h 21 min. 4% of emergency patients left before being seen (US 2%). These are medians over a year of visits, not a live wait time.
Does Mercy Hospital St Louis receive money from drug and device companies?
Drug and device makers reported $229,781 in payments to Mercy Hospital St Louis for 2025, most of it research funding, under the federal Open Payments program. A payment on its own does not show a conflict of interest.