Acute Care Hospital

Greenwich Hospital

5 Perryridge Rd, Greenwich, CT 06830

Part of Yale New Haven Health Systemsee all 4 affiliated facilities

Teaching Hospital Teaching hospitals often receive lower CMS star ratings because they treat more complex cases. This does not necessarily reflect lower quality of care. Safety Net Hospital Serves a high proportion of low-income and uninsured patients. 24/7 Emergency Services Nonprofit
4 out of 5 Stars Why 4 stars? Greenwich Hospital's 4-star rating reflects above-average performance on Mortality.

CMS Overall Hospital Quality Star Rating · Greenwich Hospital

How was Greenwich Hospital's 4-star rating calculated?

The CMS Overall Hospital Quality Star Rating applies to acute care hospitals like Greenwich Hospital. CMS standardizes every underlying measure against the national rate, computes a weighted score for each of five domains, sums them by the fixed weights below, and assigns 1–5 stars using k-means clustering across all reporting hospitals.

Domains that fed Greenwich Hospital's rating
Domain Weight Measures reported Hospital performance vs. national
Mortality 22% 6 of 7 3 better 3 same 0 worse
Safety of Care 22% 18 of 19 1 better 17 same 0 worse
Readmissions 22% 5 of 6 1 better 3 same 1 worse
Timely & Effective Care 12% 15 of 22 4 better 7 same 4 worse
Patient Experience 22% HCAHPS See HCAHPS detail below

Context that affects how to read this rating

Greenwich Hospital is a Disproportionate Share Hospital (DSH), meaning it serves a high proportion of low-income and uninsured patients. Star ratings don't adjust for patient socioeconomic mix.

How star meaning varies by hospital type. This CMS Overall Star Rating only applies to acute care hospitals. Children's hospitals (Pediatric Quality), psychiatric hospitals (IPFQR), inpatient rehabilitation facilities (IRF QRP), long-term acute care hospitals (LTACH QRP), and VA medical centers each use separate quality programs designed for their patient populations. Comparing star ratings across these facility types isn't meaningful — see the methodology page for the full mapping of which program applies to which facility.

How CareRanks computes ratings → · CMS official methodology ↗

Emergency & urgent care

How this emergency department performs on the measures that matter most when you need care fast.

177 min Typical ER visit before heading home Near the national median of 148 min
1% Walked out before being seen Better than ~75% of hospitals · national median 1%
58% Recommended sepsis care given Near the national median of 64%

From CMS Timely & Effective Care reporting.

Quality measures

Mortality

Better than National Average

Measures the rate at which patients die within 30 days of hospital admission for specific conditions. A lower mortality rate indicates better outcomes.

Underlying measures: Hybrid Hospital-Wide All-Cause Risk Standardized Mortality Rate Better Than the National Rate Hospital score: 3.10 95% interval: 2.70 – 3.70 Sample size: 1,478 Reporting period: 07/01/2023 – 06/30/2024 CMS measure id: Hybrid_HWM Death rate for heart failure patients Better Than the National Rate Hospital score: 8.60 95% interval: 6.90 – 10.60 Sample size: 409 Reporting period: 07/01/2021 – 06/30/2024 CMS measure id: MORT_30_HF Death rate for pneumonia patients Better Than the National Rate Hospital score: 14.00 95% interval: 12.20 – 15.90 Sample size: 639 Reporting period: 07/01/2021 – 06/30/2024 CMS measure id: MORT_30_PN Death rate for COPD patients No Different Than the National Rate Hospital score: 7.30 95% interval: 4.60 – 11.10 Sample size: 71 Reporting period: 07/01/2021 – 06/30/2024 CMS measure id: MORT_30_COPD Death rate for heart attack patients No Different Than the National Rate Hospital score: 10.60 95% interval: 8.30 – 13.40 Sample size: 113 Reporting period: 07/01/2021 – 06/30/2024 CMS measure id: MORT_30_AMI Death rate for stroke patients No Different Than the National Rate Hospital score: 10.90 95% interval: 8.40 – 14.00 Sample size: 182 Reporting period: 07/01/2021 – 06/30/2024 CMS measure id: MORT_30_STK Death rate for CABG surgery patients Not Available Hospital score: — Reporting period: 07/01/2021 – 06/30/2024 CMS measure id: MORT_30_CABG

Safety of Care

Same as National Average

Tracks hospital-acquired infections, surgical complications, and other patient safety indicators. Lower rates indicate better safety practices.

Underlying measures: Clostridium Difficile (C.Diff) Better than the National Benchmark Hospital score: 0.30 SIR Reporting period: 07/01/2024 – 06/30/2025 CMS measure id: HAI_6_SIR Abdominopelvic accidental puncture or laceration rate No Different Than the National Rate Hospital score: 0.83 95% interval: 0.00 – 1.80 Sample size: 889 Reporting period: 07/01/2022 – 06/30/2024 CMS measure id: PSI_15 Catheter Associated Urinary Tract Infections (ICU + select Wards) No Different than National Benchmark Hospital score: 0.24 SIR Reporting period: 07/01/2024 – 06/30/2025 CMS measure id: HAI_2_SIR Central Line Associated Bloodstream Infection (ICU + select Wards) No Different than National Benchmark Hospital score: 0.75 SIR Reporting period: 07/01/2024 – 06/30/2025 CMS measure id: HAI_1_SIR Iatrogenic pneumothorax rate No Different Than the National Rate Hospital score: 0.15 95% interval: 0.00 – 0.35 Sample size: 5,730 Reporting period: 07/01/2022 – 06/30/2024 CMS measure id: PSI_06 Rate of complications for hip/knee replacement patients No Different Than the National Rate Hospital score: 2.50 95% interval: 1.50 – 4.10 Sample size: 236 Reporting period: 04/01/2021 – 03/31/2024 CMS measure id: COMP_HIP_KNEE In-hospital fall-associated fracture rate No Different Than the National Rate Hospital score: 0.24 95% interval: 0.05 – 0.43 Sample size: 5,848 Reporting period: 07/01/2022 – 06/30/2024 CMS measure id: PSI_08 MRSA Bacteremia No Different than National Benchmark Hospital score: 0.00 SIR Reporting period: 07/01/2024 – 06/30/2025 CMS measure id: HAI_5_SIR Postoperative hemorrhage or hematoma rate No Different Than the National Rate Hospital score: 2.52 95% interval: 0.93 – 4.11 Sample size: 829 Reporting period: 07/01/2022 – 06/30/2024 CMS measure id: PSI_09 Perioperative pulmonary embolism or deep vein thrombosis rate No Different Than the National Rate Hospital score: 4.57 95% interval: 2.45 – 6.68 Sample size: 930 Reporting period: 07/01/2022 – 06/30/2024 CMS measure id: PSI_12 Postoperative acute kidney injury requiring dialysis rate No Different Than the National Rate Hospital score: 1.57 95% interval: 0.00 – 3.25 Sample size: 314 Reporting period: 07/01/2022 – 06/30/2024 CMS measure id: PSI_10 Postoperative respiratory failure rate No Different Than the National Rate Hospital score: 7.04 95% interval: 0.00 – 14.71 Sample size: 319 Reporting period: 07/01/2022 – 06/30/2024 CMS measure id: PSI_11 Postoperative sepsis rate No Different Than the National Rate Hospital score: 3.95 95% interval: 0.18 – 7.72 Sample size: 296 Reporting period: 07/01/2022 – 06/30/2024 CMS measure id: PSI_13 Pressure ulcer rate No Different Than the National Rate Hospital score: 0.66 95% interval: 0.02 – 1.30 Sample size: 5,241 Reporting period: 07/01/2022 – 06/30/2024 CMS measure id: PSI_03 CMS Medicare PSI 90: Patient safety and adverse events composite No Different Than the National Value Hospital score: 0.92 95% interval: 0.59 – 1.25 Reporting period: 07/01/2022 – 06/30/2024 CMS measure id: PSI_90 SSI - Colon Surgery No Different than National Benchmark Hospital score: 0.77 SIR Reporting period: 07/01/2024 – 06/30/2025 CMS measure id: HAI_3_SIR Death rate among surgical inpatients with serious treatable complications No Different Than the National Rate Hospital score: 162.00 95% interval: 102.57 – 221.43 Sample size: 52 Reporting period: 07/01/2022 – 06/30/2024 CMS measure id: PSI_04 Postoperative wound dehiscence rate No Different Than the National Rate Hospital score: 1.62 95% interval: 0.15 – 3.08 Sample size: 293 Reporting period: 07/01/2022 – 06/30/2024 CMS measure id: PSI_14 SSI - Abdominal Hysterectomy Not Available Hospital score: — SIR Reporting period: 07/01/2024 – 06/30/2025 CMS measure id: HAI_4_SIR

Readmissions

Same as National Average

Measures how often patients return to the hospital within 30 days of discharge. Lower readmission rates suggest effective treatment and discharge planning.

Underlying measures: 30-day Readmission, Hip/Knee Replacement Better than expected Hospital score: 0.76 Reporting period: 07/01/2021 – 06/30/2024 CMS measure id: READM-30-HIP-KNEE-HRRP 30-day Readmission, COPD As expected Hospital score: 1.01 Sample size: 75 Reporting period: 07/01/2021 – 06/30/2024 CMS measure id: READM-30-COPD-HRRP 30-day Readmission, Heart Failure As expected Hospital score: 1.02 Sample size: 454 Reporting period: 07/01/2021 – 06/30/2024 CMS measure id: READM-30-HF-HRRP 30-day Readmission, Pneumonia As expected Hospital score: 1.05 Sample size: 623 Reporting period: 07/01/2021 – 06/30/2024 CMS measure id: READM-30-PN-HRRP 30-day Readmission, Heart Attack Worse than expected Hospital score: 1.17 Sample size: 59 Reporting period: 07/01/2021 – 06/30/2024 CMS measure id: READM-30-AMI-HRRP 30-day Readmission, Bypass Surgery Hospital score: — Reporting period: 07/01/2021 – 06/30/2024 CMS measure id: READM-30-CABG-HRRP

Patient Experience

Same as National Average

Based on the HCAHPS survey — patient satisfaction with communication, cleanliness, pain management, and discharge information.

Patient survey detail — the questions feeding the Patient Experience domain above expand ↓

CMS computes the Patient Experience domain from the federal HCAHPS survey. Each bar below is one survey question; the percentage is the share of Greenwich's recent patients who gave the most positive response. HCAHPS percentages aren't directly comparable across all measures — see the methodology page for how CMS weights them.

  • Communication with Nurses 79%
  • Communication with Doctors 79%
  • Hospital Cleanliness 75%
  • Hospital Quietness 55%
  • Staff Responsiveness N/A
  • Discharge Information 86%
  • Overall Hospital Rating (9 or 10) 75%
  • Would Recommend Hospital 76%

Percentages represent patients who gave the most positive response. Survey conducted by CMS through the HCAHPS program.

Timely & Effective Care

Same as National Average

Measures how quickly the hospital provides important treatments such as antibiotics for pneumonia or interventions for heart attacks.

Underlying measures: Discharged on Antithrombotic Therapy Better than ~75% of hospitals Hospital score: 99.00 % National median: 98.00 % (higher is better) Sample size: 104 Reporting period: 01/01/2024 – 12/31/2024 CMS measure id: STK_02 Intensive Care Unit Venous Thromboembolism Prophylaxis Better than ~75% of hospitals Hospital score: 100.00 % National median: 97.00 % (higher is better) Sample size: 590 Reporting period: 01/01/2024 – 12/31/2024 CMS measure id: VTE_2 Left before being seen Better than ~75% of hospitals Hospital score: 1.00 % National median: 1.00 % (lower is better) Sample size: 42,417 Reporting period: 01/01/2024 – 12/31/2024 CMS measure id: OP_22 Septic Shock 6-Hour Bundle Better than ~75% of hospitals Hospital score: 100.00 % National median: 89.00 % (higher is better) Sample size: 12 Reporting period: 07/01/2024 – 06/30/2025 CMS measure id: SEP_SH_6HR Antithrombotic Therapy by End of Hospital Day 2 Near the national median Hospital score: 96.00 % National median: 94.00 % (higher is better) Sample size: 93 Reporting period: 01/01/2024 – 12/31/2024 CMS measure id: STK_05 Average (median) time psychiatric/mental health patients spent in the emergency department before leaving from the visit. A lower number of minutes is better Near the national median Hospital score: 249.00 min National median: 248.00 min (lower is better) Sample size: 19 Reporting period: 07/01/2024 – 06/30/2025 CMS measure id: OP_18c Average (median) time patients spent in the emergency department before leaving from the visit, excluding patients transferred to another facility or psychiatric care/mental health patients. A lower number of minutes is better Near the national median Hospital score: 177.00 min National median: 148.00 min (lower is better) Sample size: 361 Reporting period: 07/01/2024 – 06/30/2025 CMS measure id: OP_18b Average (median) time all patients spent in the emergency department before leaving from the visit, including psychiatric/mental health patients and patients who were transferred to another facility. A lower number of minutes is better Near the national median Hospital score: 178.00 min National median: 154.00 min (lower is better) Sample size: 382 Reporting period: 07/01/2024 – 06/30/2025 CMS measure id: OP_18a Appropriate care for severe sepsis and septic shock Near the national median Hospital score: 58.00 % National median: 64.00 % (higher is better) Sample size: 112 Reporting period: 07/01/2024 – 06/30/2025 CMS measure id: SEP_1 Severe Sepsis 6-Hour Bundle Near the national median Hospital score: 92.00 % National median: 94.00 % (higher is better) Sample size: 52 Reporting period: 07/01/2024 – 06/30/2025 CMS measure id: SEV_SEP_6HR Healthcare workers given influenza vaccination Near the national median Hospital score: 81.00 % National median: 79.00 % (higher is better) Sample size: 3,124 Reporting period: 10/01/2024 – 03/31/2025 CMS measure id: IMM_3 Endoscopy/polyp surveillance: appropriate follow-up interval for normal colonoscopy in average risk patients Worse than ~75% of hospitals Hospital score: 92.00 % National median: 97.00 % (higher is better) Sample size: 72 Reporting period: 01/01/2024 – 12/31/2024 CMS measure id: OP_29 Safe Use of Opioids - Concurrent Prescribing Worse than ~75% of hospitals Hospital score: 18.00 % National median: 15.00 % (lower is better) Sample size: 1,650 Reporting period: 01/01/2024 – 12/31/2024 CMS measure id: SAFE_USE_OF_OPIOIDS Septic Shock 3-Hour Bundle Worse than ~75% of hospitals Hospital score: 54.00 % National median: 72.00 % (higher is better) Sample size: 26 Reporting period: 07/01/2024 – 06/30/2025 CMS measure id: SEP_SH_3HR Severe Sepsis 3-Hour Bundle Worse than ~75% of hospitals Hospital score: 74.00 % National median: 81.00 % (higher is better) Sample size: 112 Reporting period: 07/01/2024 – 06/30/2025 CMS measure id: SEV_SEP_3HR

Clinical Staff

Greenwich Hospital has 1,156 CMS-affiliated clinicians on its roster — physicians, advanced practice providers, and other Medicare-enrolled professionals who list this hospital as an affiliated facility.

Top specialties

  • Internal Medicine 179
  • Nurse Practitioner 103
  • Physician Assistant 72
  • Cardiovascular Disease (Cardiology) 54
  • Obstetrics/Gynecology 50
  • Neurology 46
  • Family Practice 41
  • Orthopedic Surgery 40

Self-reported primary specialty in the CMS Doctors & Clinicians dataset. Many clinicians serve multiple facilities.

Practice characteristics

Accept Medicare assignment
1,111 (96%)

Bill Medicare directly at the approved rate — patients only owe co-insurance/deductible.

Offer telehealth
610 (53%)

Indicated by the clinician in their CMS profile as routinely providing virtual visits.

Medicare quality scoring (MIPS)

785 of these clinicians have a published Merit-based Incentive Payment System (MIPS) final score. Of those, 219 (28%) score above the national median of 85.5.

MIPS scoring is heavily compressed at the top of the 0–100 range, so individual scores are not a reliable consumer signal. We surface roster-level coverage and the share above the national median instead.

Source: CMS Doctors and Clinicians (Care Compare) national downloadable file and MIPS Performance Year final scores, as of 2026-07-18. Affiliations from the CMS Facility Affiliations dataset. About 16% of small facilities (critical access, rural emergency, freestanding psych, IRF/LTCH) do not appear in the affiliations file and therefore have no panel.

Find a Doctor

Search the 1,156 clinicians affiliated with Greenwich Hospital. Each name links to that clinician's official Medicare Care Compare profile, where you can see their credentials, secondary specialties, group affiliations, and (when applicable) MIPS quality scores.

Showing 30 of 1,156 clinicians (alphabetical)

Roster from CMS Doctors and Clinicians (Care Compare), updated 2026-07-18. A clinician may also practice at other facilities; "affiliated" means this hospital is on their CMS profile, not that they exclusively work here. Procedure volumes are Medicare fee-for-service counts from the CMS clinician utilization file (all practice locations, not just this hospital). Industry payment totals are from CMS Open Payments, program year 2024, and include meals, travel, consulting, and speaking fees; payments are legal and common — we show them for transparency, not as a quality judgment.

Pricing & Costs

This hospital participates in price transparency under the federal Hospital Price Transparency Rule. View 757 published procedures — gross charges, cash prices, and per-payer negotiated rates where available.

Across this hospital's priced procedures:
vs. CT median −3% roughly matches the state median
vs. national median +59% runs 59% above the national median

Median percent difference across the 520 DRGs where this hospital has a comparable published price and the comparison cohort has enough hospitals to compute a stable median.

View full pricing →

Facility Information

Licensed beds
206
Facility type
Acute Care Hospitals
Ownership
Voluntary non-profit - Private
NPI
1962802827
Emergency services
Yes — 24/7

Ownership & Finances

Ownership
Nonprofit
Charity care spend (FY2023)
$4M
List prices vs. actual cost
≈ 3.6× actual cost

From the hospital's FY2023 Medicare cost report (HCRIS).

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How Greenwich Hospital compares nearby

Compared with the 8 other acute-care hospitals within 25 miles — 9 facilities in all, CMS data only.

Among the 9 acute-care hospitals within 25 miles, Greenwich Hospital's overall star rating is 5★; the median among the 8 peers reporting it is 4.5★.

Measure This facility Nearby median Best nearby
Overall star rating reported by 8 of 8 nearby peers 5★ 4.5★ 5★
Patient experience (HCAHPS) star reported by 8 of 8 nearby peers 3★ 3★ 4★
Mortality reported by 8 of 8 nearby peers Better than National Average Same as National Average Better than National Average
Safety of Care reported by 8 of 8 nearby peers Same as National Average Same as National Average Better than National Average
Readmissions reported by 8 of 8 nearby peers Same as National Average Better than National Average Better than National Average

The comparison group

Cohort: within 25 miles · CMS data period 2026-06 · method cohort-v1 · comparisons are never affected by claiming or payment. How nearby comparisons work

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Skilled nursing facilities nearby

For planning care after discharge — CMS five-star ratings shown; always confirm availability and coverage with the facility and your insurer.

About this data

Quality and ratings data are sourced from the U.S. Centers for Medicare & Medicaid Services (CMS) Hospital Compare program. Star ratings are CMS's own calculation; CareRanks does not modify or re-weight them. Facility-level details (address, beds, ownership, teaching status) come from CMS provider files and the CMS Provider of Services file.

Pricing data, where shown, is drawn from the hospital's own Machine-Readable File (MRF) published under the federal Hospital Price Transparency Rule. See our methodology for the full update cadence and limitations.

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