Complications & Deaths Measures
20
CMS-tracked
California · Acute Care
Alta Bates Summit Medical Center
According to PlainHospital's CMS star-rating ranking (CMS Hospital Compare overall stars), Alta Bates Summit Medical Center ranks #13 of 3182 rated US hospitals by overall star rating (highest = #1).
- 5★
- CMS overall rating
- Top 12%
- national star rank
- #13 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.
350 Hawthorne Avenue, Oakland, CA 94609 · Alameda County · (510) 655-4000
The verdict
According to PlainHospital's CMS star-rating ranking (CMS Hospital Compare overall stars), Alta Bates Summit Medical Center ranks #13 of 3182 rated US hospitals by overall star rating (highest = #1). That corpus rank reflects a top-quartile CMS star rating nationally, with 9 quality measures beating the national benchmark.
- Top 12%
- CMS star rating vs 3,182 rated US hospitals
- #13 of 3182
- rated-hospital corpus placement
- 9
- measures better than national of 24 compared
- Yes
- emergency department on site
Since the last CMS release
This hospital held its 5-star rating across the May 2026 and August 2026 CMS releases.
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 Alta Bates Summit Medical Center sits among rated US hospitals
5 Top 12% higher than 88% of 3,182 rated hospitals
CMS star rating (1–5 stars), bucketed by value
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 and share, and where it sits relative to this entry.
Source CMS Hospital Compare, overall hospital rating · 2026-08-14
Alta Bates Summit Medical Center vs. California and the nation
- Alta Bates Summit Me…
Alta Bates Summit Medical Center
5 stars
- California avg
California state average
3.1 stars
- US avg
National average
3.2 stars
What this shows At 5 stars, Alta Bates Summit Medical Center rates above the California average of 3.1 and above the national average of 3.2.
Type
Acute Care Hospitals
Ownership
Voluntary non-profit - Private
Emergency Services
Yes
Birthing Friendly
N/A
Patient Experience
17
HCAHPS domains
Infection Types
6
CDC NHSN
CMS Overall Star Rating 100.0%
5 of 5 stars
Quality profile vs. the national benchmark
Mortality 8 measures
Safety of care 7 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 | 1 | Same as National |
| CMS Medicare PSI 90: Patient safety and adverse events composite | 0.88 | Same as National |
| Death rate among surgical inpatients with serious treatable complications | 130.09 | Better than National |
| Death rate for CABG surgery patients | 2 | Same as National |
| Death rate for COPD patients | 6.6 | Same as National |
| Death rate for heart attack patients | 10.1 | Same as National |
| Death rate for heart failure patients | 10.2 | Same as National |
| Death rate for pneumonia patients | 15.7 | Same as National |
| Death rate for stroke patients | 11.8 | Same as National |
| Hybrid Hospital-Wide All-Cause Risk Standardized Mortality Rate | 3.3 | Better than National |
| Iatrogenic pneumothorax rate | 0.13 | Same as National |
| In-hospital fall-associated fracture rate | 0.21 | Same as National |
| Perioperative pulmonary embolism or deep vein thrombosis rate | 2.93 | Same as National |
| Postoperative acute kidney injury requiring dialysis rate | 1.25 | Same as National |
| Postoperative hemorrhage or hematoma rate | 2.67 | 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 | 4 |
| Communication about medicines - linear mean score | N/A |
| Communication about medicines - star rating | 2 |
| Discharge information - linear mean score | N/A |
| Discharge information - star rating | 3 |
| Doctor communication - linear mean score | N/A |
| Doctor communication - star rating | 4 |
| Nurse communication - linear mean score | N/A |
| Nurse communication - star rating | 3 |
| Overall hospital rating - linear mean score | N/A |
| Overall hospital rating - star rating | 4 |
| Quietness - linear mean score | N/A |
| Quietness - star rating | 3 |
| Recommend hospital - linear mean score | N/A |
| Recommend hospital - star rating | 5 |
| Summary star rating | 3 |
Safety & Infections
| Measure | Score | vs. National |
|---|---|---|
| Catheter Associated Urinary Tract Infections (ICU + select Wards) | 0.704 | Same as National |
| Central Line Associated Bloodstream Infection (ICU + select Wards) | 0.411 | Same as National |
| Clostridium Difficile (C.Diff) | 0.247 | Better than National |
| MRSA Bacteremia | 1.149 | Same as National |
| SSI - Abdominal Hysterectomy | N/A | Not Available |
| SSI - Colon Surgery | 0.266 | Same as National |
Staffing & Spending
Unplanned Visits & Readmissions
| Measure | Score | vs. National |
|---|---|---|
| Acute Myocardial Infarction (AMI) 30-Day Readmission Rate | 12.3 | Same as National |
| Heart failure (HF) 30-Day Readmission Rate | 18.7 | Same as National |
| Hospital return days for heart attack patients | -19.6 | Fewer Days Than Average per 100 Discharges |
| Hospital return days for heart failure patients | -19.2 | Fewer Days Than Average per 100 Discharges |
| Hospital return days for pneumonia patients | -11.2 | Average Days per 100 Discharges |
| Hybrid Hospital-Wide All-Cause Readmission Measure (HWR) | 13.4 | Better than National |
| Pneumonia (PN) 30-Day Readmission Rate | 14.2 | Same as National |
| Rate of emergency department (ED) visits for patients receiving outpatient chemotherapy | 5.1 | Same as National |
| Rate of inpatient admissions for patients receiving outpatient chemotherapy | 10.8 | Same as National |
| Rate of readmission after hip/knee replacement | 4.7 | Same as National |
| Rate of readmission for CABG | 9.3 | Same as National |
| Rate of readmission for chronic obstructive pulmonary disease (COPD) patients | 18.3 | Same as National |
| Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies) | 14.8 | Same as National |
| Ratio of unplanned hospital visits after hospital outpatient surgery | 1.2 | Same as National |
Medicare Spending
| Measure | Score |
|---|---|
| Medicare hospital spending per patient (Medicare Spending per Beneficiary) | 1.01 |
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 |
Nationwide hospitals with similar CMS profiles
Two Hospital Compare peer sets for Alta Bates Summit Medical Center, both outside California so the neighborhoods are not the same-state list below.
Similar CMS star rating
Nearest overall stars outside CA (5/5 here).
Similar mortality outcomes
Nearest mortality measures rated better than national, outside CA (2 better here).
Nearby Hospitals in California
Other Medicare-certified hospitals in California.
One of 377 Medicare-certified hospitals in California, 6 are shown here.
60th Medical Group (Travis AFB)
Travis AFB, CA
No rating Acute Care - Department of Defense
Adventist Health and Rideout
Marysville, CA
2/5
Acute Care Hospitals
Adventist Health Bakersfield
Bakersfield, CA
2/5
Acute Care Hospitals
Adventist Health Clearlake
Clearlake, CA
2/5
Critical Access Hospitals
Adventist Health Delano
Delano, CA
2/5
Acute Care Hospitals
Adventist Health Hanford
Hanford, CA
3/5
Acute Care Hospitals
Compare Alta Bates Summit Medical Center vs 60th Medical Group (Travis AFB) →
Hospital Quality Guides
Frequently Asked Questions
How does Alta Bates Summit Medical Center compare to other hospitals on CMS star rating?
According to PlainHospital's CMS star-rating ranking, Alta Bates Summit Medical Center ranks #13 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 Alta Bates Summit Medical Center?
Alta Bates Summit Medical Center has an overall CMS star rating of 5 out of 5, above the 3.2-star national average.
How does Alta Bates Summit Medical Center perform on quality measures?
9 of 24 compared mortality, safety, and readmission measures rate better than the national average at Alta Bates Summit Medical Center; 0 rate worse.
What do patients say about Alta Bates Summit Medical Center?
Alta Bates Summit Medical Center reports 17 HCAHPS patient-experience domain scores. Star ratings range from 2 to 5 out of 5.
What are the infection rates at Alta Bates Summit Medical Center?
Alta Bates Summit Medical Center tracks 6 healthcare-associated infection types (CDC NHSN). 1 are better than the national benchmark, 0 are worse, and 4 are at the national average.
Does Alta Bates Summit Medical Center have emergency services?
Yes, Alta Bates Summit Medical Center provides emergency services.
What type of hospital is Alta Bates Summit Medical Center?
Alta Bates Summit Medical Center is a Acute Care Hospitals facility with Voluntary non-profit - Private ownership, located in Oakland, CA.
How much does Medicare spend at Alta Bates Summit Medical Center?
1 Medicare spending category is on file for Alta Bates Summit Medical Center, per episode vs. the national median.
Does Alta Bates Summit Medical Center offer maternal health services?
Yes, Alta Bates Summit Medical Center reports 4 maternal health measures.
Data Sources
Source: Centers for Medicare & Medicaid Services (CMS) Hospital Compare. Last refreshed from CMS: . About PlainHospital
Read our methodology & full data source list
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