CMS certification 360374
Mercy Health Kings Mills Hospital LLC
5440 Kings Island Drive, Mason, OH 45040
CMS does not publish an overall star rating for Mercy Health Kings Mills Hospital. 76% of patients who answered CMS's national survey would definitely recommend it, against a US average of 71%. On all 3 death, complication, infection and readmission measures CMS could compare, it is no different from the national rate. Emergency patients spend a median of 2 h 14 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: 341 completed surveys, 22% 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 low; 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 | OH | US |
|---|---|---|---|
| Median time in the emergency department before leaving Lower is better · 352 visits sampled · US median for EDs of the same volume: 2 h 3 min | 2 h 14 min | 2 h 38 min | 2 h 42 min |
| Median time for psychiatric and mental health patients Lower is better · 11 visits sampled | 4 h 21 min | 4 h 8 min | 4 h 17 min |
| Left before being seen Lower is better · 8,630 patients | 0% | 2% | 2% |
| Severe sepsis and septic shock: all recommended care given Higher is better · 110 patients | 74% | 63% | 65% |
How Mercy Health Kings Mills Hospital 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 Health Kings Mills Hospital LLCThis hospital | Not rated | 76% | 2 h 14 min | No different |
| Atrium Medical CenterSame county · Franklin | 4/5 | 64% | 2 h 43 min | 1 better 1 worse |
| McCullough-Hyde Memorial HospitalSame ZIP area · Oxford | 3/5 | 78% | 2 h 12 min | 1 worse |
| Mercy Health - Fairfield HospitalSame ZIP area · Fairfield | 3/5 | 67% | 2 h 42 min | 1 better 1 worse |
| Fort Hamilton Hughes Memorial HospitalSame ZIP area · Hamilton | 3/5 | 67% | 2 h 2 min | 4 better 1 worse |
| West Chester HospitalSame ZIP area · West Chester | 3/5 | 70% | 3 h 39 min | 1 better 3 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 Mason.
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 466 cases | Too few cases | 3.7% | 3.9% |
| Heart failure 28 cases | Too few cases | 11.5% | 11.1% |
| Pneumonia 32 cases | Too few cases | 15.9% | 15.2% |
4 more measures had too few cases here to report.
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 |
|---|---|---|---|
| Pressure ulcers (bed sores) 57 cases | No different | 0.6 per 1,000 likely 0 per 1,000 – 1.91 per 1,000 | 0.63 per 1,000 |
| Collapsed lung caused by a procedure 72 cases | No different | 0.21 per 1,000 likely 0 per 1,000 – 0.45 per 1,000 | 0.21 per 1,000 |
| Broken bones from falls in the hospital 71 cases | No different | 0.27 per 1,000 likely 0.05 per 1,000 – 0.49 per 1,000 | 0.27 per 1,000 |
10 more measures had too few cases here to report.
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 |
|---|---|---|---|
| C. diff intestinal infections | No different | 0.41 likely 0.07 – 1.37 | 1 |
5 more measures had too few cases here to report.
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 heart failure 71 cases | Too few cases | 21.2% | 21.3% |
| Readmitted after pneumonia 82 cases | Too few cases | 17.3% | 17.3% |
| Days back in hospital after pneumonia 36 cases | Too few cases | -9.7 days per 100 | — |
| Unplanned visits after an outpatient colonoscopy 70 cases | No different | 12.6 per 1,000 likely 9.3 per 1,000 – 17.1 per 1,000 | 13 per 1,000 |
10 more measures had too few cases here to report.
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 Health Kings Mills Hospital
Is Mercy Health Kings Mills Hospital a good hospital?
CMS does not publish an overall star rating for Mercy Health Kings Mills Hospital. On all 3 death, complication, infection and readmission measures CMS could compare, it is no different from the national rate. These are hospital-wide results published by CMS; they do not rate individual doctors or departments.
Would patients recommend Mercy Health Kings Mills Hospital?
76% of patients who answered CMS's national survey would definitely recommend it, against a US average of 71%. The figure comes from 341 completed HCAHPS surveys.
How long is the wait in the Mercy Health Kings Mills Hospital emergency room?
Emergency patients spend a median of 2 h 14 min in its emergency department before leaving (US median 2 h 42 min). Among US emergency departments with low patient volume, like this one, the median is 2 h 3 min. 0% of emergency patients left before being seen (US 2%). These are medians over a year of visits, not a live wait time.