Source: CMS Care Compare, July 2026 releaseER figures are medians, not live waitsAbout the data
Visiting Clara Maass Medical Center
- Photo ID and your insurance, Medicare or Medicaid card
- A list of your medicines, doses and allergies
- Your doctor's name and phone number
- A phone charger
Official links: Website for Clara Maass Medical Center (opens the hospital's site)
Nearby hospitals
- 1.0mi Silver Lake Hospital LTACH Newark, NJ Call Silver Lake Hospital LTACH Directions to Silver Lake Hospital LTACH (Google Maps) Details for Silver Lake Hospital LTACH
- 2.3mi Mountainside Hospital Glen Ridge, NJ · Emergency room · median ER visit 3 hr 49 min Call Mountainside Hospital Directions to Mountainside Hospital (Google Maps) Details for Mountainside Hospital
- 2.8mi Saint Michael's Medical Center Newark, NJ · Emergency room · median ER visit 2 hr 49 min Call Saint Michael's Medical Center Directions to Saint Michael's Medical Center (Google Maps) Details for Saint Michael's Medical Center
Quick answers about Clara Maass Medical Center
How long is the ER wait at Clara Maass Medical Center?
CMS doesn't publish live wait times. Over the 12 months CMS reported, patients treated and sent home spent a median of 2 hr 22 min in the Clara Maass Medical Center emergency room (the average across New Jersey hospitals is 3 hr 6 min). 0% of ER patients left before being seen. For tonight's wait, check the hospital's website (opens the hospital's own site) or call (973) 450-2000. In an emergency, call 911.
What is the phone number for Clara Maass Medical Center?
The main phone number for Clara Maass Medical Center is (973) 450-2000, from Medicare's hospital records.
Call (973) 450-2000What is the address of Clara Maass Medical Center?
Clara Maass Medical Center is at 1 Clara Maass Dr, Belleville, NJ 07109.
Directions (opens Google Maps)Does Clara Maass Medical Center have an emergency room?
Yes. Clara Maass Medical Center has an emergency department, according to Medicare data.
What is Clara Maass Medical Center's Medicare star rating?
Clara Maass Medical Center has an overall rating of 3 out of 5 stars from the Centers for Medicare & Medicaid Services (CMS). Star ratings come from CMS quality and safety measures, not patient reviews.
Quality and performance
Centers for Medicare & Medicaid Services · data as of July 2026
Patients treated and sent home from the emergency department at Clara Maass Medical Center spend a median of 2 hours 22 minutes there. That is 44 minutes shorter than the average across New Jersey hospitals (3 hours 6 minutes).
Source: CMS Hospital General Information and Timely & Effective Care. Wait times are a median over a past 12-month reporting period, not live data. Not affiliated with CMS or with Clara Maass Medical Center. For a medical emergency, call 911.
Compare ER waits across New Jersey · How New Jersey hospitals rank on star ratings · Other birthing-friendly hospitals in New Jersey · How we source this data · Something wrong on this page? Tell us
What patients say
CMS patient survey (HCAHPS) · 675 completed surveys · patients discharged Oct 2024 – Sep 2025
Patients gave Clara Maass Medical Center a 3-star patient experience rating out of 5. 64% would definitely recommend it (U.S. average 71%). 63% rated it 9 or 10 out of 10.
The patient survey (HCAHPS) asks a random sample of adult patients about their recent hospital stay. CMS adjusts the results for the mix of patients and how the survey was done, so hospitals can be compared fairly. About the data.
Infections, complications and deaths
Centers for Medicare & Medicaid Services · compared with hospitals nationwide
Of the 5 hospital-acquired infections CMS could compare, Clara Maass Medical Center was better than the national benchmark on 1 and worse on 0. Its rate of serious complications was same as national.
Hospital-acquired infections
Serious complications
Death rates within 30 days
| Patients treated for | This hospital | U.S. |
|---|---|---|
| Heart attack patients | 12.9% | 11.9% |
| Heart failure patients | 9.6% | 11.1% |
| Pneumonia patients | 17.0% | 15.2% |
| Stroke patients | 10.1% | 11.9% |
| COPD patients | 7.7% | 8.6% |
| Hospital-wide, all conditions | 3.5% | 3.9% |
Risk-adjusted rates. CMS has not published a statistical better/worse comparison for these death rates in the current release, so small differences from the U.S. rate may be chance.
Other complications
None of the other safety indicators CMS compares was statistically better or worse than national.
All 11 complication measures
| Measure | This hospital | U.S. | CMS comparison |
|---|---|---|---|
| Deaths among surgical patients with serious treatable complicationsper 1,000 patients | 204.96 | 173.3 | Same as national |
| Pressure ulcers (bed sores)per 1,000 patients | 0.62 | 0.63 | Same as national |
| Falls in the hospital that caused a broken boneper 1,000 patients | 0.23 | 0.27 | Same as national |
| Collapsed lung caused by a medical procedureper 1,000 patients | 0.17 | 0.21 | Same as national |
| Bleeding or blood clot under the skin after surgeryper 1,000 patients | 2.12 | 2.34 | Same as national |
| Kidney injury needing dialysis after surgeryper 1,000 patients | 1.61 | 1.67 | Same as national |
| Respiratory failure after surgeryper 1,000 patients | 9.09 | 9.42 | Same as national |
| Blood clots in the lungs or legs after surgeryper 1,000 patients | 4.18 | 3.52 | Same as national |
| Bloodstream infection (sepsis) after surgeryper 1,000 patients | 4.36 | 5.27 | Same as national |
| Surgical wound splitting openper 1,000 patients | 1.69 | 1.77 | Same as national |
| Accidental cuts or tears during abdominal surgeryper 1,000 patients | 0.88 | 1.06 | Same as national |
"Better" or "worse" means CMS found the difference from the national benchmark statistically significant; most hospitals are "no different". Infection results compare the infections a hospital reported with the number predicted for a hospital of its size and type (a ratio below 1 means fewer than predicted), for Oct 2024 – Sep 2025. Death and complication rates are risk-adjusted for how sick patients were. Each death rate counts deaths within 30 days of a hospital stay, pooled over one to three years of Medicare patients depending on the measure. About the data.
Health insurance at Clara Maass Medical Center
Original Medicare: Medicare-certified, so it can bill Original Medicare (Medicare number 310009). Medicare Advantage plans have their own networks, which this section does not cover.
New Jersey runs its own exchange, Get Covered NJ. Check its provider directory for Clara Maass Medical Center.
Source: the insurers' 2027 machine-readable provider files listed in the CMS Marketplace public use files, loaded November 4, 2026, matched to hospitals by NPI from CMS Hospital Enrollments. How we match networks to hospitals Networks change; confirm with your insurer before you go.
Readmissions and return visits
Centers for Medicare & Medicaid Services · Medicare patients · Jul 2023 – Jun 2025
On the 2 readmission and return-visit measures CMS could compare, Clara Maass Medical Center was no different from the national rate or its expected level.
Back in the hospital within 30 days
| After a stay for | This hospital | U.S. | CMS comparison |
|---|---|---|---|
| Heart attack | 15.5% | 14.4% | Not compared |
| Heart failure | 21.9% | 21.3% | Not compared |
| Pneumonia | 18.4% | 17.3% | Not compared |
| COPD (chronic lung disease) | 20.3% | 20% | Not compared |
Return trips after a stay or procedure
Medicare's readmission program
Excess readmission ratio: this hospital's predicted readmissions divided by the number expected for a typical hospital with the same patients. Above 1.00 means more readmissions than expected. 2 of 4 conditions are above 1.00.
| Condition | Ratio | Patients | Readmissions |
|---|---|---|---|
| Heart failure | 1.040 | 359 | More than expected |
| Heart attack | 1.005 | 88 | More than expected |
| COPD | 0.976 | 117 | Fewer than expected |
| Pneumonia | 0.951 | 241 | Fewer than expected |
Readmission rates count Medicare patients who were admitted to any acute-care hospital within 30 days of leaving this one, adjusted for how sick they were. "Better" or "worse" means CMS found the difference from the national rate statistically significant; most hospitals are "no different". Return-day and outpatient-surgery measures compare the hospital with what CMS expected for its own patients. The Readmissions Reduction Program ratios are shown as CMS publishes them; whether a hospital's payments are reduced depends on how its ratios compare with similar hospitals, so a ratio above 1.00 alone doesn't mean a penalty. About the data.
Timely and effective care
Centers for Medicare & Medicaid Services · all patients unless noted · Oct 2024 – Sep 2025
Clara Maass Medical Center's emergency department is classed by CMS as very high volume.
| Measure | This hospital | U.S.* |
|---|---|---|
| Sepsis: got all recommended early treatmentPatients with severe sepsis or septic shock who received every step of the recommended early care bundle. Higher is better. 226 patients. | 79% | 65% |
| Septic shock: full treatment within 3 hoursHigher is better. 86 patients. | 95% | 73% |
| Typical time in the ER before going homeMedian minutes from arrival to leaving, for ER patients sent home (not counting mental health patients or transfers). Lower is better. 404 patients. | 142 min | 162 min |
| Typical ER time for mental health patients sent homeMedian minutes from arrival to leaving. Lower is better. 20 patients. | 206 min | 257 min |
| Patients who left the ER before being seenLower is better. 80,156 patients. | 0% | 2% |
| Health care workers vaccinated against fluHigher is better. 1,961 patients. | 97% | 78% |
| Discharged on two opioids, or an opioid and a benzodiazepinePatients sent home with prescriptions that raise the risk of overdose when combined. Lower is better. 1,686 patients. | 10% | 15% |
| Colonoscopy: right follow-up interval for average-risk patientsHigher is better. 86 patients. | 91% | 93% |
| Blood clot prevention givenHigher is better. 7,372 patients. | 49% | 90%* |
| Stroke: discharged on clot-prevention medicineHigher is better. 437 patients. | 96% | 98%* |
| Stroke: clot prevention started by day 2Higher is better. 429 patients. | 88% | 94%* |
CMS publishes these process-of-care measures without a better/worse verdict, so the U.S. figure is shown for context; small differences, or results based on few patients, may not mean much. *Median of all hospitals CMS reports, where CMS publishes no national figure. About the data.
Maternity care
Centers for Medicare & Medicaid Services · reported by the hospital · Jan 2024 – Dec 2024
Maternity measures are reported by hospitals that deliver babies. The U.S. figure is the median of the hospitals CMS reports, not a CMS verdict. About the data.
Medicare spending and payment programs
Centers for Medicare & Medicaid Services
The Hospital-Acquired Condition Reduction Program cuts Medicare payments by 1% for the quarter of hospitals with the worst scores. The Hospital Value-Based Purchasing Program withholds a small share of every hospital's Medicare payments and pays it back according to the total performance score. A spending ratio of 1.00 equals the national median; spending reflects prices, the services patients received and care after discharge, not quality. Some hospitals, such as critical access, children's and cancer hospitals, are not part of these programs. About the data.
Care after a stay at Clara Maass Medical Center
Medicare-certified providers near this hospital, with their CMS ratings. A hospital discharge planner can make the referral.
Skilled nursing facilities nearby
- 0.8mi Job Haines Home for Aged People Bloomfield, NJ · 40 beds Medicare overall 5 of 5 stars · Short-stay quality 4 of 5
- 1.2mi Forest Hills Center for Rehabilitation and Healing Newark, NJ · 120 beds Medicare overall 2 of 5 stars · Short-stay quality 5 of 5
- 1.7mi Park Crescent Healthcare & Rehabilitation Center East Orange, NJ · 190 beds Medicare overall 4 of 5 stars · Short-stay quality 5 of 5
Skilled nursing ratings and inspections at Nursing Homes In Each State
Dialysis centers nearby See more
- 1.0mi FKC BellevilleBelleville, NJ
- 1.3mi DaVita Newark Mt PleasantNewark, NJ
- 1.3mi Vistacare Dialysis CenterNewark, NJ
Home health agencies nearby See more
- 3.0mi Promise Care NjEast Orange, NJ · 62% would recommend
- 4.3mi Adoration Home HealthClifton, NJ · 73% would recommend
- 4.6mi Barnabas Health Home Care and HospiceWest Orange, NJ · 72% would recommend
Hospice care providers nearby See more
- 1.7mi Compassionate Care Hospice of CliftonBloomfield, NJ · 81% would recommend
- 1.7mi Hospice of New JerseyBloomfield, NJ · 71% would recommend
- 4.6mi Barnabas Health Home Care and HospiceWest Orange, NJ · 81% would recommend
Source: CMS Care Compare. Distances are approximate.
Inpatient psychiatric unit
CMS Inpatient psychiatric care Quality Reporting Program, data through March 2025 · unit CCN 310009
Clara Maass Medical Center runs an inpatient psychiatric unit that reports its own results to Medicare. Follow-up within 7 days: 37% here, against 37% nationally. Where CMS compares facilities statistically, this one is no different from the national rate.
After discharge
During the stay
Source: CMS Inpatient psychiatric care Quality Reporting Program (Provider Data Catalog). Better/worse labels appear only where CMS itself compared the facility with the national rate; other figures are shown next to the national figure for context. If you or someone you know is in crisis, call or text 988 (Suicide and Crisis Lifeline) or call 911.
Doctors at Clara Maass Medical Center
292 Medicare-enrolled doctors and other clinicians list this hospital as an affiliation, across 27 specialties.
Find doctors in Belleville
Medicare-enrolled specialists with a practice in Belleville, with addresses, phone numbers and the hospitals they work with.
Federal rules require hospitals to publish their prices, including the rates they've negotiated with each insurer and their cash prices. Clara Maass Medical Center lists them here:
From the hospital's price transparency file (www.rwjbh.org/cms-hpt.txt), checked Nov 7, 2026. For an estimate of what you'll pay, ask the hospital or your insurer; Medicare's averages are on our procedure cost pages.
What Medicare paid at Clara Maass Medical Center
Centers for Medicare & Medicaid Services · original Medicare patients · 2024
Average hospital charges and actual payments for the procedures Medicare patients most often had here, compared with the average for New Jersey.
Hospital stays
| Stay | Stays | Avg billed | Avg payment (Medicare + patient) | vs state |
|---|---|---|---|---|
| Heart failure and shock with major complicationsDRG 291 | 112 | $117,087 | $12,247 | −4% |
| Septicemia or severe sepsis without ventilator >96 hours with major complicationsDRG 871 | 93 | $128,636 | $18,359 | −5% |
| Acute myocardial infarction, discharged alive with major complicationsDRG 280 | 83 | $113,536 | $14,811 | −3% |
| Simple pneumonia and pleurisy with major complicationsDRG 193 | 64 | $105,418 | $11,586 | −12% |
| Kidney and urinary tract infections with major complicationsDRG 689 | 50 | $119,989 | $12,412 | +7% |
| Respiratory infections and inflammations with major complicationsDRG 177 | 48 | $145,877 | $17,212 | +7% |
| Kidney and urinary tract infections without major complicationsDRG 690 | 43 | $59,395 | $8,845 | +9% |
| Renal failure with major complicationsDRG 682 | 40 | $100,598 | $14,220 | −4% |
Outpatient services
| Service | Services | Avg billed | Avg allowed |
|---|---|---|---|
| Comprehensive Observation ServicesAPC 8011 | 456 | $24,886 | $2,796 |
| Level 2 Intraocular ProceduresAPC 5492 | 359 | $15,410 | $4,309 |
| Level 1 Intraocular ProceduresAPC 5491 | 154 | $12,394 | $2,387 |
| Level 3 Intraocular ProceduresAPC 5493 | 98 | $20,025 | $5,523 |
| Level 1 Endovascular ProceduresAPC 5191 | 75 | $21,628 | $3,243 |
Charges are the hospital's list prices; payments are what Medicare, the patient and any other insurer actually paid (for outpatient services, Medicare's allowed amount). Private insurance prices differ. "vs state" compares this hospital's average payment with the state average for the same stay. All procedure costs.
Size and finances
Medicare cost report · fiscal year ending Dec 2024
As reported by the hospital to CMS; not audited. Operating margin is income from patient care divided by net patient revenue and leaves out investment income and donations. Compare New Jersey hospital finances.
Who owns Clara Maass Medical Center
Medicare enrollment and ownership records (PECOS)
Medicare lists the hospital's legal name as Clara Maass Medical Center, a non-profit organization, incorporated 1981.
520 doctors and other clinicians list Clara Maass Medical Center as a hospital affiliation in Medicare's clinician directory.
Organizations with 5% or more ownership (directly or through other companies), partnership interests or operational control, as the hospital reported them to Medicare. Records can lag behind recent sales. Individuals are not listed. Who owns America's hospitals.
The area around Clara Maass Medical Center
HRSA shortage designations and BLS pay data
Primary care: Parts of Essex are federally designated health professional shortage areas (2 designations). Highest shortage score 13.
Mental health: Parts of Essex are federally designated health professional shortage areas (1 designation). Highest shortage score 19.
Nurse pay: registered nurses in New Jersey earn a median $106,500 a year. Healthcare salaries in New Jersey.
Shortage areas are designated by the Health Resources and Services Administration where there are too few primary care, mental health or dental providers for the population; scores run from 0 to 25 for primary and mental health care and 0 to 26 for dental care, higher meaning greater need. New Jersey shortage areas
Closest other hospitals
Healthcare pay in New Jersey
Registered nurses across New Jersey (all employers) earned a median of $106,500 a year (BLS, May 2025).Registered Nurse (RN) salary in New JerseyNurse Practitioner salary in New JerseyRespiratory Therapist salary in New JerseyHealthcare salaries in New Jersey
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Cite this data
Writing about Clara Maass Medical Center? You're welcome to quote these figures. They are free to use under CC BY 4.0: please credit HospitalsInEachState.com and link to this page.