Complications & Deaths Measures
20
CMS-tracked
Missouri · Acute Care
Mercy Hospital South
According to PlainHospital's CMS star-rating ranking (CMS Hospital Compare overall stars), Mercy Hospital South ranks #2675 of 3182 rated US hospitals by overall star rating (highest = #1).
- 2★
- CMS overall rating
- #2675 of 3182
- Corpus placement
- 20
- Quality measures
- 6
- Infection types
Data currency: Hospital quality, safety, and patient-experience measures from the CMS Care Compare program (published quarterly), last refreshed May 2026. See our methodology for source dates. Spot a figure that looks wrong? Report a correction.
10010 Kennerly Road, Saint Louis, MO 63128 · St. Louis County · (314) 525-1000
The verdict
According to PlainHospital's CMS star-rating ranking (CMS Hospital Compare overall stars), Mercy Hospital South ranks #2675 of 3182 rated US hospitals by overall star rating (highest = #1). Overall CMS stars: 2/5 (below the 3.2-star national average).
- 2 / 5
- CMS overall star rating
- #2675 of 3182
- rated-hospital corpus placement
- 1
- measures better than national of 25 compared
- Yes
- emergency department on site
Since the last CMS release
CMS lowered this hospital from 3 to 2 stars between its May 2026 and August 2026 releases, a fall of 1.
CMS replaces its file at each release rather than publishing a changelog, so this comparison exists only because the earlier release is kept on file. See what changed nationally.
Where Mercy Hospital South sits among rated US hospitals
2 Top 94% higher than 6% of 3,182 rated hospitals
Each bar is a band; taller bars hold more rated hospitals. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Hospital Compare, overall hospital rating · 2026-08-14
Mercy Hospital South vs. Missouri and the nation
- Mercy Hospital South
Mercy Hospital South
2 stars
- Missouri avg
Missouri state average
3.1 stars
- US avg
National average
3.2 stars
What this shows At 2 stars, Mercy Hospital South rates below the Missouri average of 3.1 and below the national average of 3.2.
Type
Acute Care Hospitals
Ownership
Voluntary non-profit - Private
Emergency Services
Yes
Birthing Friendly
Yes
Patient Experience
17
HCAHPS domains
Infection Types
6
CDC NHSN
CMS Overall Star Rating 40.0%
2 of 5 stars
Quality profile vs. the national benchmark
Mortality 8 measures
Safety of care 8 measures
Readmission 9 measures
Better than national Same as national Worse than national
Quality Measures
| Measure | Score | vs. National |
|---|---|---|
| Abdominopelvic accidental puncture or laceration rate | 0.71 | Same as National |
| CMS Medicare PSI 90: Patient safety and adverse events composite | 0.8 | Same as National |
| Death rate among surgical inpatients with serious treatable complications | 202.05 | Same as National |
| Death rate for CABG surgery patients | 2.9 | Same as National |
| Death rate for COPD patients | 9 | Same as National |
| Death rate for heart attack patients | 10.4 | Same as National |
| Death rate for heart failure patients | 12.5 | Same as National |
| Death rate for pneumonia patients | 16.3 | Same as National |
| Death rate for stroke patients | 12 | Same as National |
| Hybrid Hospital-Wide All-Cause Risk Standardized Mortality Rate | 3.7 | Same as National |
| Iatrogenic pneumothorax rate | 0.25 | Same as National |
| In-hospital fall-associated fracture rate | 0.27 | Same as National |
| Perioperative pulmonary embolism or deep vein thrombosis rate | 3.01 | Same as National |
| Postoperative acute kidney injury requiring dialysis rate | 1.42 | Same as National |
| Postoperative hemorrhage or hematoma rate | 2.5 | Same as National |
Patient Experience (HCAHPS)
Experience profile vs. the national average
Source: CMS Hospital Compare, HCAHPS patient survey star ratings.
| Survey Question | Star Rating |
|---|---|
| Cleanliness - linear mean score | N/A |
| Cleanliness - star rating | 1 |
| Communication about medicines - linear mean score | N/A |
| Communication about medicines - star rating | 1 |
| Discharge information - linear mean score | N/A |
| Discharge information - star rating | 3 |
| Doctor communication - linear mean score | N/A |
| Doctor communication - star rating | 2 |
| Nurse communication - linear mean score | N/A |
| Nurse communication - star rating | 2 |
| Overall hospital rating - linear mean score | N/A |
| Overall hospital rating - star rating | 2 |
| Quietness - linear mean score | N/A |
| Quietness - star rating | 3 |
| Recommend hospital - linear mean score | N/A |
| Recommend hospital - star rating | 3 |
| Summary star rating | 2 |
Safety & Infections
| Measure | Score | vs. National |
|---|---|---|
| Catheter Associated Urinary Tract Infections (ICU + select Wards) | 0.487 | Same as National |
| Central Line Associated Bloodstream Infection (ICU + select Wards) | 0.463 | Same as National |
| Clostridium Difficile (C.Diff) | 0.173 | Better than National |
| MRSA Bacteremia | 0.569 | Same as National |
| SSI - Abdominal Hysterectomy | 1.808 | Same as National |
| SSI - Colon Surgery | 1.285 | Same as National |
Staffing & Spending
Unplanned Visits & Readmissions
| Measure | Score | vs. National |
|---|---|---|
| Acute Myocardial Infarction (AMI) 30-Day Readmission Rate | 13.2 | Same as National |
| Heart failure (HF) 30-Day Readmission Rate | 19.6 | Same as National |
| Hospital return days for heart attack patients | -1 | Average Days per 100 Discharges |
| Hospital return days for heart failure patients | 4.8 | Average Days per 100 Discharges |
| Hospital return days for pneumonia patients | 23.4 | More Days Than Average per 100 Discharges |
| Hybrid Hospital-Wide All-Cause Readmission Measure (HWR) | 15.8 | Same as National |
| Pneumonia (PN) 30-Day Readmission Rate | 18.2 | Same as National |
| Rate of emergency department (ED) visits for patients receiving outpatient chemotherapy | N/A | Number of Cases Too Small |
| Rate of inpatient admissions for patients receiving outpatient chemotherapy | N/A | Number of Cases Too Small |
| Rate of readmission after hip/knee replacement | 6 | Same as National |
| Rate of readmission for CABG | 9 | Same as National |
| Rate of readmission for chronic obstructive pulmonary disease (COPD) patients | 20.5 | Same as National |
| Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies) | 11.5 | Same as National |
| Ratio of unplanned hospital visits after hospital outpatient surgery | 0.9 | Same as National |
Medicare Spending
| Measure | Score |
|---|---|
| Medicare hospital spending per patient (Medicare Spending per Beneficiary) | 1.02 |
Maternal Health
| Measure | Score |
|---|---|
| Cesarean Birth | N/A |
| Maternal Morbidity Structural Measure | N/A |
| Risk Adjusted Severe Obstetric Complications (All) | N/A |
| Risk Adjusted Severe Obstetric Complications (excluding blood-transfusion-only cases) | N/A |
Nearby Hospitals in Missouri
Other Medicare-certified hospitals in Missouri.
Barnes Jewish Hospital
Saint Louis, MO
4/5
Acute Care Hospitals
Barnes-Jewish St Peters Hospital
Saint Peters, MO
3/5
Acute Care Hospitals
Barnes-Jewish West County Hospital
Creve Coeur, MO
5/5
Acute Care Hospitals
Bates County Memorial Hospital
Butler, MO
3/5
Acute Care Hospitals
Belton Regional Medical Center
Belton, MO
2/5
Acute Care Hospitals
Boone Hospital Center
Columbia, MO
4/5
Acute Care Hospitals
Hospital Quality Guides
Frequently Asked Questions
How does Mercy Hospital South compare to other hospitals on CMS star rating?
According to PlainHospital's CMS star-rating ranking, Mercy Hospital South ranks #2675 of 3182 rated US hospitals by overall star rating (highest = #1). That ordinal matches our top-rated hospital listing (star_rating DESC). See /methodology#corpus-placement for the exact sort basis.
What is the CMS star rating for Mercy Hospital South?
Mercy Hospital South has an overall CMS star rating of 2 out of 5, below the 3.2-star national average.
How does Mercy Hospital South perform on quality measures?
1 of 25 compared mortality, safety, and readmission measures rate better than the national average at Mercy Hospital South; 1 rate worse.
What do patients say about Mercy Hospital South?
Mercy Hospital South reports 17 HCAHPS patient-experience domain scores. Star ratings range from 1 to 3 out of 5.
What are the infection rates at Mercy Hospital South?
Mercy Hospital South tracks 6 healthcare-associated infection types (CDC NHSN). 1 are better than the national benchmark, 0 are worse, and 5 are at the national average.
Does Mercy Hospital South have emergency services?
Yes, Mercy Hospital South provides emergency services.
What type of hospital is Mercy Hospital South?
Mercy Hospital South is a Acute Care Hospitals facility with Voluntary non-profit - Private ownership, located in Saint Louis, MO. This facility has received the CMS Birthing-Friendly designation.
How much does Medicare spend at Mercy Hospital South?
1 Medicare spending category is on file for Mercy Hospital South, per episode vs. the national median.
Does Mercy Hospital South offer maternal health services?
Yes, Mercy Hospital South reports 4 maternal health measures. This facility has been designated as Birthing-Friendly by CMS.
Data Sources
Source: Centers for Medicare & Medicaid Services (CMS) Hospital Compare. Last refreshed from CMS: . About PlainHospital
Read our methodology & full data source list
Share this page
A summary card with the figures from this page. Reuse it with attribution, on the same CC BY 4.0 terms as the citation below.
Measure collection windows on this page span (CMS per-measure dates). The citation vintage above is the portal refresh stamp, not a claim that every measure shares one year. See methodology.
Every figure on PlainHospital is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.