Mary Greeley Medical CenterAmes, IA
Mary Greeley Medical Center is a public acute care hospital in Ames, Iowa, with an emergency department. As of the July 2026 CMS release, patients treated and sent home spend a median of 2 hr 26 min in its emergency department, 18 min longer than the Iowa average of 2 hr 8 min. Medicare rates it 4 out of 5 stars overall, and patients give it 4 out of 5 in the Medicare patient survey.
(515) 239-2011 Visit Website- Time ZoneCST
- CountyStory
- Emergency CapableYes
- FIPS19169
- Area Code515
Visiting Mary Greeley 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
Quality and performance
Centers for Medicare & Medicaid Services · data as of July 2026
Patients spend an average of 2 hours 26 minutes in the emergency department at Mary Greeley Medical Center. That is 18 minutes longer than the Iowa average of 2 hours 8 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 Mary Greeley Medical Center. For a medical emergency, call 911.
Compare ER waits across Iowa · How Iowa hospitals rank on star ratings · Other birthing-friendly hospitals in Iowa · How we source this data · Something wrong on this page? Tell us
What patients say
CMS patient survey (HCAHPS) · 1,555 completed surveys · patients discharged Oct 2024 – Sep 2025
Patients gave Mary Greeley Medical Center a 4-star patient experience rating out of 5. 82% would definitely recommend it (U.S. average 71%). 79% 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, Mary Greeley 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 | 11.9% | 11.9% |
| Heart failure patients | 12.6% | 11.1% |
| Pneumonia patients | 16.0% | 15.2% |
| Stroke patients | 11.5% | 11.9% |
| COPD patients | 7.2% | 8.6% |
| Hospital-wide, all conditions | 4.3% | 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 12 complication measures
| Measure | This hospital | U.S. | CMS comparison |
|---|---|---|---|
| Complications after hip or knee replacement% of patients | 4.9 | 4.1 | Not compared |
| Deaths among surgical patients with serious treatable complicationsper 1,000 patients | 165.13 | 173.3 | Same as national |
| Pressure ulcers (bed sores)per 1,000 patients | 0.23 | 0.63 | Same as national |
| Falls in the hospital that caused a broken boneper 1,000 patients | 0.27 | 0.27 | Same as national |
| Collapsed lung caused by a medical procedureper 1,000 patients | 0.36 | 0.21 | Same as national |
| Bleeding or blood clot under the skin after surgeryper 1,000 patients | 2.7 | 2.34 | Same as national |
| Kidney injury needing dialysis after surgeryper 1,000 patients | 1.4 | 1.67 | Same as national |
| Respiratory failure after surgeryper 1,000 patients | 6.65 | 9.42 | Same as national |
| Blood clots in the lungs or legs after surgeryper 1,000 patients | 3.33 | 3.52 | Same as national |
| Bloodstream infection (sepsis) after surgeryper 1,000 patients | 3.84 | 5.27 | Same as national |
| Surgical wound splitting openper 1,000 patients | 1.61 | 1.77 | Same as national |
| Accidental cuts or tears during abdominal surgeryper 1,000 patients | 0.8 | 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.
Nearby ERs with shorter visits
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, Mary Greeley 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 | 14.7% | 14.4% | Not compared |
| Heart failure | 21.6% | 21.3% | Not compared |
| Pneumonia | 18.1% | 17.3% | Not compared |
| COPD (chronic lung disease) | 19% | 20% | Not compared |
| Hip or knee replacement | 5.3% | 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. 1 of 5 conditions is above 1.00.
| Condition | Ratio | Patients | Readmissions |
|---|---|---|---|
| Heart failure | 1.014 | 508 | More than expected |
| Pneumonia | 0.982 | 391 | Fewer than expected |
| COPD | 0.948 | 138 | Fewer than expected |
| Hip or knee replacement | 0.891 | – | Fewer than expected |
| Heart attack | 0.886 | 192 | 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
Mary Greeley Medical Center's emergency department is classed by CMS as medium 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. | 68% | 65% |
| Septic shock: full treatment within 3 hoursHigher is better. 81 patients. | 83% | 73% |
| Stroke: brain scan read within 45 minutes of ER arrivalPatients arriving with stroke symptoms whose head CT or MRI was interpreted within 45 minutes. Higher is better. 16 patients. | 56% | 69% |
| 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. 388 patients. | 146 min | 162 min |
| Typical ER time for mental health patients sent homeMedian minutes from arrival to leaving. Lower is better. 17 patients. | 295 min | 257 min |
| Patients who left the ER before being seenLower is better. 33,063 patients. | 2% | 2% |
| Health care workers vaccinated against fluHigher is better. 2,446 patients. | 95% | 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. 1,755 patients. | 15% | 15% |
| Colonoscopy: right follow-up interval for average-risk patientsHigher is better. 292 patients. | 99% | 93% |
| Blood clot prevention given in intensive careHigher is better. 685 patients. | 71% | 97%* |
| Stroke: discharged on clot-prevention medicineHigher is better. 104 patients. | 97% | 98%* |
| Stroke with atrial fibrillation: discharged on a blood thinnerHigher is better. 27 patients. | 41% | 75%* |
| Stroke: clot prevention started by day 2Higher is better. 95 patients. | 93% | 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
Value-based purchasing scores by area
| Area | Score (out of 100) |
|---|---|
| Clinical outcomesDeath rates and complications | 20 |
| Patient experiencePatient survey results | 43 |
| SafetyHospital-acquired infections | 5 |
| Efficiency and costMedicare spending per patient | 20 |
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 160030
Mary Greeley Medical Center runs an inpatient psychiatric unit that reports its own results to Medicare. Follow-up within 7 days: 34% 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.
Inpatient rehabilitation unit
CMS Inpatient rehabilitation Quality Reporting Program, data through December 2025 · unit CCN 16T030
Mary Greeley Medical Center runs an inpatient rehabilitation unit that reports its own results to Medicare. Returned home or to the community: 67% 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 Mary Greeley Medical Center
168 Medicare-enrolled doctors and specialists list this hospital as an affiliation, across 27 specialties.
What Medicare paid at Mary Greeley 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 Iowa.
Hospital stays
| Stay | Stays | Avg charge | Avg payment | vs state |
|---|---|---|---|---|
| Heart failure and shock with major complicationsDRG 291 | 151 | $25,111 | $8,447 | −14% |
| Septicemia or severe sepsis without ventilator >96 hours with major complicationsDRG 871 | 119 | $46,890 | $13,042 | −12% |
| Respiratory infections and inflammations with major complicationsDRG 177 | 69 | $38,757 | $10,862 | −13% |
| Gastrointestinal hemorrhage with complicationsDRG 378 | 65 | $25,539 | $6,602 | −12% |
| Acute myocardial infarction, discharged alive with major complicationsDRG 280 | 54 | $42,075 | $10,774 | −9% |
| Simple pneumonia and pleurisy with major complicationsDRG 193 | 50 | $34,160 | $8,705 | −13% |
| Kidney and urinary tract infections without major complicationsDRG 690 | 49 | $21,657 | $5,331 | −14% |
| Esophagitis, gastroenteritis and miscellaneous digestive disorders without major complicationsDRG 392 | 48 | $26,468 | $5,246 | −14% |
Outpatient services
| Service | Services | Avg charge | Avg allowed |
|---|---|---|---|
| Level 1 Intraocular ProceduresAPC 5491 | 646 | $9,892 | $1,994 |
| Comprehensive Observation ServicesAPC 8011 | 524 | $13,514 | $2,326 |
| Level 5 Musculoskeletal ProceduresAPC 5115 | 354 | $36,354 | $11,234 |
| Level 2 Excision/Biopsy/Incision and DrainageAPC 5072 | 260 | $6,565 | $1,385 |
| Level 5 Urology and Related ServicesAPC 5375 | 192 | $18,219 | $4,425 |
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 Iowa hospital finances.
Who owns Mary Greeley Medical Center
Medicare enrollment and ownership records (PECOS)
Medicare lists the hospital's legal name as Mary Greeley Medical Center, a non-profit organization.
303 doctors and other clinicians list Mary Greeley 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.
Non-profit finances
IRS Form 990 · tax year ending Jun 2023 · Mary Greeley Medical Center Foundation (EIN 23-7064009)
As filed with the IRS by Mary Greeley Medical Center Foundation. Matched by name and address, so check the filing to confirm it's the right organization. See the full Form 990 filings · Non-profit hospital finances.
The area around Mary Greeley Medical Center
HRSA shortage designations and BLS pay data
Primary care: Parts of Story are federally designated health professional shortage areas (1 designation). Highest shortage score 17.
Mental health: Parts of Story are federally designated health professional shortage areas (1 designation). Highest shortage score 18.
Dental: Parts of Story are federally designated health professional shortage areas (1 designation). Highest shortage score 17.
Nurse pay: registered nurses in Iowa earn a median $78,630 a year. Healthcare salaries in Iowa.
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. Iowa shortage areas
Find doctors in Ames
Medicare-enrolled specialists with a practice in Ames, with addresses, phone numbers and the hospitals they work with.
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