Healthcare Insights
Top 25 hospitals by case mix index
A hospital’s case mix index (CMI) reflects the complexity of its patient population and the associated resources for their care.
In the Definitive Healthcare HospitalView product, we calculate CMIs from data in the Medicare Cost Report (MCR). The following table lists the top 25 hospitals with the largest case mix index. Results in this analysis are according to the most recent 12-month interval tracked in our database.
Top 25 hospitals with highest case mix index
| Rank | Definitive ID | Hospital name | Location | Case mix index | Explore dataset |
|---|---|---|---|---|---|
| 1 | 552489 | Nebraska Spine Hospital | Omaha, NE | 5.35 | Explore |
| 2 | 1561 | Doctors Hospital LLC | Leawood, KS | 5.29 | Explore |
| 3 | 3321 | Oklahoma Spine Hospital | Oklahoma City, OK | 4.55 | Explore |
| 4 | 4164 | Northwest Hills Surgical Hospital (AKA Austin Surgery Center) | Austin, TX | 4.39 | Explore |
| 5 | 1738 | Specialists Hospital Shreveport | Shreveport, LA | 4.38 | Explore |
| 6 | 776981 | Mercy Specialty Hospital - Southeast Kansas (AKA Premier Surgical Institute) | Galena, KS | 4.21 | Explore |
| 7 | 3332 | HPI Northwest Surgical Hospital | Oklahoma City, OK | 4.17 | Explore |
| 8 | 1756 | The Spine Hospital of Louisiana at the NeuroMedical Center (FKA the Neuromedical Center Surgical Hospital) | Baton Rouge, LA | 4.03 | Explore |
| 9 | 3744 | Saint Thomas Hospital for Specialty Surgery (FKA the Hospital for Spinal Surgery) | Nashville, TN | 3.98 | Explore |
| 10 | 274123 | OrthoColorado Hospital | Lakewood, CO | 3.94 | Explore |
| 11 | 3901 | Baylor Scott & White the Heart Hospital Baylor - Plano | Plano, TX | 3.85 | Explore |
| 12 | 3364 | Tulsa Spine & Specialty Hospital | Tulsa, OK | 3.81 | Explore |
| 13 | 1287 | Parkview Ortho Hospital | Fort Wayne, IN | 3.79 | Explore |
| 14 | 1317 | St Vincent Heart Center of Indiana | Indianapolis, IN | 3.79 | Explore |
| 15 | 1826 | Physicians Medical Center | Houma, LA | 3.75 | Explore |
| 16 | 1100 | Northwest Specialty Hospital | Post Falls, ID | 3.71 | Explore |
| 17 | 764511 | Baylor Scott & White the Heart Hospital Baylor - Denton | Denton, TX | 3.69 | Explore |
| 18 | 1818 | Avala Hospital (FKA Fairway Medical Center) | Covington, LA | 3.68 | Explore |
| 19 | 975307 | Townsen Memorial Hospital | Humble, TX | 3.60 | Explore |
| 20 | 1090 | Treasure Valley Hospital | Boise, ID | 3.60 | Explore |
| 21 | 5692 | Fred Hutchinson Cancer Center (FKA Seattle Cancer Care Alliance) | Seattle, WA | 3.56 | Explore |
| 22 | 329 | Fresno Surgical Hospital | Fresno, CA | 3.54 | Explore |
| 23 | 2548 | CHI Health Nebraska Heart (FKA Nebraska Heart Hospital) | Lincoln, NE | 3.43 | Explore |
| 24 | 552269 | Cypress Pointe Hospital | Hammond, LA | 3.41 | Explore |
| 25 | 4095 | CHI St Luke's Health - Lakeside Hospital | The Woodlands, TX | 3.37 | Explore |
Fig. 1. Data is from the Definitive Healthcare HospitalView product and sourced from the October 2022 Medicare Cost Report release. Analysis is based on the most recent 12-month interval tracked in our database. Accessed January 2023.
Which hospitals have the highest case mix index?
Nebraska Spine Hospital in Omaha and Doctors Hospital in Leawood, Kansas each have CMIs more than 5.25, the highest among U.S. hospitals. Both hospitals specialize in spine surgery, which can be a highly complex procedure and likely contributes to their CMIs.
How is case mix calculated?
Patients are classified into Medicare severity diagnosis-related groups (MS-DRGs) depending on condition, case complexity, and medical needs. The Definitive Healthcare HospitalView product uses the average of MS-DRG weights across inpatient claims to calculate a CMI.
What does a high CMI mean?
Higher CMIs often result in higher reimbursement rates for hospitals. The Centers for Medicare and Medicaid Services (CMS) uses their own CMI calculations based on MS-DRGs and DRGs to determine reimbursement for Medicare and Medicaid beneficiaries.
For example, many of the top 25 hospitals on the list above specialize in spinal surgery, general or orthopedic surgery, or the heart, which can involve complicated patient procedures. Because they treat the most complex cases with potentially higher risk, the hospital may be reimbursed at a higher rate.
What is the national average case mix index for hospitals?
Definitive Healthcare calculates a case mix index value for more than 5,800 hospitals in our HospitalView product. The average CMI is 1.50, with a range of values from 0.42 to 5.35.
CMI for the top 25 hospitals on the list above ranges from 3.37 to 5.35, with an average CMI of 3.95.
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