CMS certification 310009
Clara Maass Medical Center
One Clara Maass Drive, Belleville, NJ 07109
Clara Maass Medical Center has a CMS overall rating of 3 out of 5 stars. 64% of patients who answered CMS's national survey would definitely recommend it, against a US average of 71%. Of the 20 death, complication, infection and readmission measures CMS could compare, it does better than the nation on 2 and worse on 2. Emergency patients spend a median of 2 h 22 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: 675 completed surveys, 12% 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 | NJ | US |
|---|---|---|---|
| Median time in the emergency department before leaving Lower is better · 404 visits sampled · US median for EDs of the same volume: 3 h 21 min | 2 h 22 min | 3 h 6 min | 2 h 42 min |
| Median time for psychiatric and mental health patients Lower is better · 20 visits sampled | 3 h 26 min | 4 h 52 min | 4 h 17 min |
| Left before being seen Lower is better · 80,156 patients | 0% | 2% | 2% |
| Severe sepsis and septic shock: all recommended care given Higher is better · 226 patients | 79% | 73% | 65% |
How Clara Maass Medical Center 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 |
|---|---|---|---|---|
| Clara Maass Medical CenterThis hospital | 3/5 | 64% | 2 h 22 min | 2 better 2 worse |
| Newark Beth Israel Medical CenterSame county · Newark | 2/5 | 64% | 2 h 56 min | 3 better 3 worse |
| The University HospitalSame county · Newark | 1/5 | 56% | 5 h 7 min | 3 better 2 worse |
| Saint Michael's Medical CenterSame county · Newark | 4/5 | 71% | 2 h 49 min | 2 better 1 worse |
| Hackensack Meridian Mountainside MedicalSame county · Montclair | 4/5 | 62% | 3 h 49 min | 1 better 1 worse |
| Cooperman Barnabas Medical CenterSame county · Livingston | 3/5 | 71% | 2 h 9 min | 3 better 5 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.
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 2,623 cases | Too few cases | 3.5% | 3.9% |
| Heart attack 128 cases | Too few cases | 12.9% | 11.9% |
| Heart failure 327 cases | Too few cases | 9.6% | 11.1% |
| Pneumonia 314 cases | Too few cases | 17% | 15.2% |
| Stroke 210 cases | Too few cases | 10.1% | 11.9% |
| COPD 95 cases | Too few cases | 7.7% | 8.6% |
1 more measure 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 |
|---|---|---|---|
| Serious complications, combined measure | No different | 0.96 likely 0.59 – 1.33 | 1 |
| Deaths after a serious but treatable surgical complication 32 cases | No different | 204.96 per 1,000 likely 141.44 per 1,000 – 268.49 per 1,000 | 173.3 per 1,000 |
| Pressure ulcers (bed sores) 3,881 cases | No different | 0.62 per 1,000 likely 0 per 1,000 – 1.35 per 1,000 | 0.63 per 1,000 |
| Collapsed lung caused by a procedure 4,213 cases | No different | 0.17 per 1,000 likely 0 per 1,000 – 0.38 per 1,000 | 0.21 per 1,000 |
| Broken bones from falls in the hospital 4,326 cases | No different | 0.23 per 1,000 likely 0.03 per 1,000 – 0.43 per 1,000 | 0.27 per 1,000 |
| Bleeding or hematoma after surgery 798 cases | No different | 2.12 per 1,000 likely 0.58 per 1,000 – 3.67 per 1,000 | 2.34 per 1,000 |
| Kidney injury needing dialysis after surgery 139 cases | No different | 1.61 per 1,000 likely 0 per 1,000 – 3.32 per 1,000 | 1.67 per 1,000 |
| Breathing failure after surgery 162 cases | No different | 9.09 per 1,000 likely 0.34 per 1,000 – 17.84 per 1,000 | 9.42 per 1,000 |
| Blood clots in the lungs or legs after surgery 814 cases | No different | 4.18 per 1,000 likely 1.89 per 1,000 – 6.47 per 1,000 | 3.52 per 1,000 |
| Sepsis after surgery 135 cases | No different | 4.36 per 1,000 likely 0.4 per 1,000 – 8.32 per 1,000 | 5.27 per 1,000 |
| Surgical wound splitting open 163 cases | No different | 1.69 per 1,000 likely 0.19 per 1,000 – 3.18 per 1,000 | 1.77 per 1,000 |
| Accidental cut or tear during abdominal surgery 771 cases | No different | 0.88 per 1,000 likely 0 per 1,000 – 1.88 per 1,000 | 1.06 per 1,000 |
1 more measure 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 |
|---|---|---|---|
| Bloodstream infections from central lines (CLABSI) | No different | 0 | 1 |
| Urinary tract infections from catheters (CAUTI) | No different | 0 | 1 |
| Surgical site infections after colon surgery | No different | 0 | 1 |
| MRSA bloodstream infections | No different | 0.99 likely 0.31 – 2.38 | 1 |
| C. diff intestinal infections | Better | 0.16 likely 0.06 – 0.36 | 1 |
1 more measure 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 a heart attack 214 cases | Too few cases | 15.5% | 14.4% |
| Readmitted after heart failure 697 cases | Too few cases | 21.9% | 21.3% |
| Readmitted after pneumonia 536 cases | Too few cases | 18.4% | 17.3% |
| Readmitted after COPD 236 cases | Too few cases | 20.3% | 20% |
| Days back in hospital after a heart attack 103 cases | Too few cases | 8.3 days per 100 | — |
| Days back in hospital after heart failure 366 cases | Too few cases | 12.4 days per 100 | — |
| Days back in hospital after pneumonia 294 cases | Too few cases | 37.4 days per 100 | — |
| Unplanned visits after an outpatient colonoscopy 418 cases | No different | 14.5 per 1,000 likely 10.7 per 1,000 – 19.2 per 1,000 | 13 per 1,000 |
| Unplanned visits after outpatient surgery 206 cases | No different | 0.9 likely 0.7 – 1.2 | — |
5 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 Clara Maass Medical Center
Is Clara Maass Medical Center a good hospital?
Clara Maass Medical Center has a CMS overall rating of 3 out of 5 stars. Of the 20 death, complication, infection and readmission measures CMS could compare, it does better than the nation on 2 and worse on 2. These are hospital-wide results published by CMS; they do not rate individual doctors or departments.
Would patients recommend Clara Maass Medical Center?
64% of patients who answered CMS's national survey would definitely recommend it, against a US average of 71%. The figure comes from 675 completed HCAHPS surveys.
How long is the wait in the Clara Maass Medical Center emergency room?
Emergency patients spend a median of 2 h 22 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. 0% of emergency patients left before being seen (US 2%). These are medians over a year of visits, not a live wait time.