CMS certification 430015
Avera St Mary's Hospital
801 E Sioux, Pierre, SD 57501
Avera St Mary's Hospital has a CMS overall rating of 2 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 17 death, complication, infection and readmission measures CMS could compare, it does better than the nation on 1 and worse on 1. Emergency patients spend a median of 2 h 7 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: 263 completed surveys, 24% 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 low; 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 | SD | US |
|---|---|---|---|
| Median time in the emergency department before leaving Lower is better · 6,935 visits sampled · US median for EDs of the same volume: 2 h 3 min | 2 h 7 min | 1 h 55 min | 2 h 42 min |
| Median time for psychiatric and mental health patients Lower is better · 437 visits sampled | 2 h 41 min | 2 h 27 min | 4 h 17 min |
| Left before being seen Lower is better · 8,559 patients | 1% | 1% | 2% |
| Stroke symptoms: brain scan read within 45 minutes Higher is better · 11 patients | 36% | 58% | 69% |
| Severe sepsis and septic shock: all recommended care given Higher is better · 144 patients | 81% | 67% | 65% |
How Avera St Mary's Hospital 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 |
|---|---|---|---|---|
| Avera St Mary's HospitalThis hospital | 2/5 | 64% | 2 h 7 min | 1 better 1 worse |
| Community Memorial HospitalSame ZIP area · Burke | Not rated | 100% | 2 h 8 min | No different |
| Avera Gregory HospitalSame ZIP area · Gregory | Not rated | 89% | 2 h 19 min | 1 better |
| Hans P Peterson Memorial Hospital - CahSame ZIP area · Philip | Not rated | 84% | 1 h 28 min | 1 better |
| Phs Indian Hospital at RosebudSame ZIP area · Rosebud | Not rated | 59% | — | No different |
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 280 cases | Too few cases | 3.8% | 3.9% |
| Heart failure 44 cases | Too few cases | 14.8% | 11.1% |
| Pneumonia 104 cases | Too few cases | 19.7% | 15.2% |
| Stroke 28 cases | Too few cases | 12.2% | 11.9% |
3 more measures 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 | 1.07 likely 0.6 – 1.54 | 1 |
| After hip or knee replacement 63 cases | Too few cases | 5.3% | 4.1% |
| Pressure ulcers (bed sores) 761 cases | No different | 0.46 per 1,000 likely 0 per 1,000 – 1.6 per 1,000 | 0.63 per 1,000 |
| Collapsed lung caused by a procedure 1,030 cases | No different | 0.2 per 1,000 likely 0 per 1,000 – 0.44 per 1,000 | 0.21 per 1,000 |
| Broken bones from falls in the hospital 997 cases | No different | 0.26 per 1,000 likely 0.05 per 1,000 – 0.48 per 1,000 | 0.27 per 1,000 |
| Bleeding or hematoma after surgery 233 cases | No different | 2.27 per 1,000 likely 0.56 per 1,000 – 3.99 per 1,000 | 2.34 per 1,000 |
| Kidney injury needing dialysis after surgery 105 cases | No different | 1.66 per 1,000 likely 0 per 1,000 – 3.38 per 1,000 | 1.67 per 1,000 |
| Breathing failure after surgery 105 cases | No different | 11.41 per 1,000 likely 1.58 per 1,000 – 21.23 per 1,000 | 9.42 per 1,000 |
| Blood clots in the lungs or legs after surgery 247 cases | No different | 3.15 per 1,000 likely 0.64 per 1,000 – 5.66 per 1,000 | 3.52 per 1,000 |
| Sepsis after surgery 93 cases | No different | 7.77 per 1,000 likely 3.5 per 1,000 – 12.03 per 1,000 | 5.27 per 1,000 |
| Surgical wound splitting open 43 cases | No different | 1.74 per 1,000 likely 0.22 per 1,000 – 3.26 per 1,000 | 1.77 per 1,000 |
| Accidental cut or tear during abdominal surgery 121 cases | No different | 1.02 per 1,000 likely 0 per 1,000 – 2.1 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 |
|---|---|---|---|
| C. diff intestinal infections | No different | 0 | 1 |
5 more measures 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 heart failure 31 cases | Too few cases | 21.2% | 21.3% |
| Readmitted after pneumonia 77 cases | Too few cases | 16% | 17.3% |
| Readmitted after hip or knee replacement 54 cases | Too few cases | 5.5% | 5.8% |
| Days back in hospital after heart failure 44 cases | Too few cases | 20 days per 100 | — |
| Days back in hospital after pneumonia 97 cases | Too few cases | -18.6 days per 100 | — |
| Unplanned visits after an outpatient colonoscopy 934 cases | No different | 13.4 per 1,000 likely 10.2 per 1,000 – 17.4 per 1,000 | 13 per 1,000 |
| Hospital admissions during outpatient chemotherapy 126 cases | No different | 10.5 per 100 likely 7.6 per 100 – 14 per 100 | 10.7 per 100 |
| ER visits during outpatient chemotherapy 126 cases | No different | 4.5 per 100 likely 2.9 per 100 – 6.6 per 100 | 5.4 per 100 |
| Unplanned visits after outpatient surgery 393 cases | No different | 1 likely 0.8 – 1.4 | — |
5 more measures had too few cases here to report.
Clinicians registered at this address
37 clinicians give this hospital's street address as their practice location in NPPES, the federal provider registry. The same address can take in offices and clinics in the building, and a listing does not prove admitting privileges or current employment.
| Specialty | Clinicians |
|---|---|
| Physical Therapist | 7 |
| Family Medicine | 5 |
| Family | 4 |
| Nurse Anesthetist, Certified Registered | 4 |
| Occupational Therapist | 4 |
| Nurse Practitioner | 3 |
| Medical | 2 |
| Occupational Therapy Assistant | 2 |
| Pharmacist | 2 |
| Physician Assistant | 2 |
| Emergency Medicine | 1 |
| Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist | 1 |
First 12 alphabetically
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 Avera St Mary's Hospital
Is Avera St Mary's Hospital a good hospital?
Avera St Mary's Hospital has a CMS overall rating of 2 out of 5 stars. Of the 17 death, complication, infection and readmission measures CMS could compare, it does better than the nation on 1 and worse on 1. These are hospital-wide results published by CMS; they do not rate individual doctors or departments.
Would patients recommend Avera St Mary's Hospital?
64% of patients who answered CMS's national survey would definitely recommend it, against a US average of 71%. The figure comes from 263 completed HCAHPS surveys.
How long is the wait in the Avera St Mary's Hospital emergency room?
Emergency patients spend a median of 2 h 7 min in its emergency department before leaving (US median 2 h 42 min). Among US emergency departments with low patient volume, like this one, the median is 2 h 3 min. 1% of emergency patients left before being seen (US 2%). These are medians over a year of visits, not a live wait time.