Trinity Health Ann Arbor HospitalAnn Arbor, MI
Trinity Health Ann Arbor Hospital is a non-profit acute care hospital in Ann Arbor, Michigan, with an emergency department. As of the July 2026 CMS release, patients treated and sent home spend a median of 4 hr 1 min in its emergency department, 1 hr 18 min longer than the Michigan average of 2 hr 43 min. Medicare rates it 4 out of 5 stars overall, and patients give it 3 out of 5 in the Medicare patient survey.
(734) 712-3456 Visit Website- Time ZoneEST
- CountyWashtenaw
- Emergency CapableYes
- FIPS26161
- Area Code734
Visiting Trinity Health Ann Arbor Hospital
- 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
Quality and performance
Centers for Medicare & Medicaid Services · data as of July 2026
Patients spend an average of 4 hours 1 minute in the emergency department at Trinity Health Ann Arbor Hospital. That is 1 hour 18 minutes longer than the Michigan average of 2 hours 43 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 Trinity Health Ann Arbor Hospital. For a medical emergency, call 911.
Compare ER waits across Michigan · How Michigan hospitals rank on star ratings · Other birthing-friendly hospitals in Michigan · How we source this data · Something wrong on this page? Tell us
What patients say
CMS patient survey (HCAHPS) · 593 completed surveys · patients discharged Oct 2024 – Sep 2025
Patients gave Trinity Health Ann Arbor Hospital a 3-star patient experience rating out of 5. 77% would definitely recommend it (U.S. average 71%). 71% 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 6 hospital-acquired infections CMS could compare, Trinity Health Ann Arbor Hospital was better than the national benchmark on 2 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 | 9.6% | 11.9% |
| Heart failure patients | 8.1% | 11.1% |
| Pneumonia patients | 12.9% | 15.2% |
| Stroke patients | 11.9% | 11.9% |
| COPD patients | 6.5% | 8.6% |
| Coronary bypass (CABG) surgery patients | 1.5% | 2.4% |
| Hospital-wide, all conditions | 3.2% | 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
All 12 complication measures
| Measure | This hospital | U.S. | CMS comparison |
|---|---|---|---|
| Complications after hip or knee replacement% of patients | 3.3 | 4.1 | Not compared |
| Deaths among surgical patients with serious treatable complicationsper 1,000 patients | 201.35 | 173.3 | Same as national |
| Pressure ulcers (bed sores)per 1,000 patients | 0.49 | 0.63 | Same as national |
| Falls in the hospital that caused a broken boneper 1,000 patients | 0.36 | 0.27 | Same as national |
| Collapsed lung caused by a medical procedureper 1,000 patients | 0.22 | 0.21 | Same as national |
| Bleeding or blood clot under the skin after surgeryper 1,000 patients | 3.07 | 2.34 | Same as national |
| Kidney injury needing dialysis after surgeryper 1,000 patients | 0.88 | 1.67 | Same as national |
| Respiratory failure after surgeryper 1,000 patients | 5.87 | 9.42 | Same as national |
| Blood clots in the lungs or legs after surgeryper 1,000 patients | 2.55 | 3.52 | Same as national |
| Bloodstream infection (sepsis) after surgeryper 1,000 patients | 5.29 | 5.27 | Same as national |
| Surgical wound splitting openper 1,000 patients | 2.25 | 1.77 | Same as national |
| Accidental cuts or tears during abdominal surgeryper 1,000 patients | 1.91 | 1.06 | Worse than 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.
Compare Trinity Health Ann Arbor Hospital
Readmissions and return visits
Centers for Medicare & Medicaid Services · Medicare patients · Jul 2023 – Jun 2025
On the 4 readmission and return-visit measures CMS could compare, Trinity Health Ann Arbor Hospital 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 | 14% | 14.4% | Not compared |
| Heart failure | 20.5% | 21.3% | Not compared |
| Pneumonia | 17.2% | 17.3% | Not compared |
| COPD (chronic lung disease) | 19.4% | 20% | Not compared |
| Heart bypass surgery (CABG) | 10.5% | 11% | Not compared |
| Hip or knee replacement | 5.4% | 5.8% | 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 6 conditions are above 1.00.
| Condition | Ratio | Patients | Readmissions |
|---|---|---|---|
| Pneumonia | 1.087 | 790 | More than expected |
| Heart attack | 1.017 | 443 | More than expected |
| Hip or knee replacement | 0.996 | 662 | Fewer than expected |
| Heart failure | 0.982 | 1,113 | Fewer than expected |
| COPD | 0.980 | 315 | Fewer than expected |
| Heart bypass surgery | 0.862 | – | 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
Trinity Health Ann Arbor Hospital'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. 117 patients. | 50% | 65% |
| Septic shock: full treatment within 3 hoursHigher is better. 33 patients. | 70% | 73% |
| Heart attack (STEMI): timely clot-busting or artery-opening careHigher is better. 35 patients. | 43% | 53%* |
| 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. 375 patients. | 241 min | 162 min |
| Typical ER time for mental health patients sent homeMedian minutes from arrival to leaving. Lower is better. 22 patients. | 326 min | 257 min |
| Patients who left the ER before being seenLower is better. 85,525 patients. | 2% | 2% |
| Health care workers vaccinated against fluHigher is better. 6,315 patients. | 64% | 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. 9,463 patients. | 13% | 15% |
| Colonoscopy: right follow-up interval for average-risk patientsHigher is better. 125 patients. | 98% | 93% |
| Blood clot prevention givenHigher is better. 17,307 patients. | 84% | 90%* |
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
Value-based purchasing scores by area
| Area | Score (out of 100) |
|---|---|
| Clinical outcomesDeath rates and complications | 61.7 |
| Patient experiencePatient survey results | 37 |
| SafetyHospital-acquired infections | 21.7 |
| Efficiency and costMedicare spending per patient | 40 |
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.
Inpatient psychiatric unit
CMS Inpatient psychiatric care Quality Reporting Program, data through March 2025 · unit CCN 230156
Trinity Health Ann Arbor Hospital runs an inpatient psychiatric unit that reports its own results to Medicare. Follow-up within 7 days: 51% here, against 37% nationally. CMS rates it better than national on readmitted within 30 days.
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.
Inpatient rehabilitation unit
CMS Inpatient rehabilitation Quality Reporting Program, data through December 2025 · unit CCN 23T156
Trinity Health Ann Arbor Hospital runs an inpatient rehabilitation unit that reports its own results to Medicare. Returned home or to the community: 65% here, against 67% nationally. Where CMS compares facilities statistically, this one is no different from the national rate.
Results
Safety
Cost
Source: CMS Inpatient rehabilitation 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.
Doctors at Trinity Health Ann Arbor Hospital
1,016 Medicare-enrolled doctors and specialists list this hospital as an affiliation, across 37 specialties.
What Medicare paid at Trinity Health Ann Arbor Hospital
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 Michigan.
Hospital stays
| Stay | Stays | Avg charge | Avg payment | vs state |
|---|---|---|---|---|
| Septicemia or severe sepsis without ventilator >96 hours with major complicationsDRG 871 | 444 | $53,594 | $17,170 | same |
| Heart failure and shock with major complicationsDRG 291 | 342 | $34,490 | $11,945 | +3% |
| Major hip and knee joint replacement or reattachment of lower extremity without major complicationsDRG 470 | 249 | $56,681 | $16,262 | same |
| Simple pneumonia and pleurisy with major complicationsDRG 193 | 147 | $37,226 | $11,512 | same |
| Esophagitis, gastroenteritis and miscellaneous digestive disorders without major complicationsDRG 392 | 138 | $24,955 | $7,193 | −2% |
| Respiratory infections and inflammations with major complicationsDRG 177 | 126 | $43,743 | $14,296 | same |
| Pulmonary edema and respiratory failureDRG 189 | 109 | $38,716 | $11,704 | +1% |
| Kidney and urinary tract infections without major complicationsDRG 690 | 105 | $22,627 | $6,836 | −5% |
Outpatient services
| Service | Services | Avg charge | Avg allowed |
|---|---|---|---|
| Comprehensive Observation ServicesAPC 8011 | 596 | $12,859 | $2,429 |
| Level 2 Excision/Biopsy/Incision and DrainageAPC 5072 | 325 | $5,836 | $1,484 |
| Level 2 Upper GI ProceduresAPC 5302 | 244 | $8,955 | $1,744 |
| Level 3 Electrophysiologic ProceduresAPC 5213 | 213 | $96,364 | $21,570 |
| Level 1 Endovascular ProceduresAPC 5191 | 200 | $21,041 | $2,998 |
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 Jun 2025
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 Michigan hospital finances.
Who owns Trinity Health Ann Arbor Hospital
Medicare enrollment and ownership records (PECOS)
Medicare lists the hospital's legal name as St Joseph Mercy Hospital, a non-profit organization.
1,773 doctors and other clinicians list Trinity Health Ann Arbor Hospital 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 Trinity Health Ann Arbor Hospital
HRSA shortage designations and BLS pay data
Primary care: Parts of Washtenaw are federally designated health professional shortage areas (1 designation). Highest shortage score 12.
Nurse pay: registered nurses in Michigan earn a median $94,300 a year. Healthcare salaries in Michigan.
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. Michigan shortage areas
Find doctors in Ann Arbor
Medicare-enrolled specialists with a practice in Ann Arbor, with addresses, phone numbers and the hospitals they work with.
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