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Case Mix Index
The Case Mix Index (CMI) is the average relative DRG weight of a hospital’s inpatient discharges, calculated by summing the Medicare Severity-Diagnosis Related Group (MS-DRG) weight for each discharge and dividing the total by the number of discharges. The CMI reflects the diversity, clinical complexity, and resource needs of all the patients in the hospital. A higher CMI indicates a more complex and resource-intensive case load. Although the MS-DRG weights, provided by the Centers for Medicare & Medicaid Services (CMS), were designed for the Medicare population, they are applied here to all discharges regardless of payer. Note: It is not meaningful to add the CMI values together.
Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| contactPoint |
{
"fn": "Department of Health Care Access and Information, Healthcare Analytics Branch",
"@type": "vcard:Contact",
"hasEmail": "mailto:dataandreports@hcai.ca.gov"
}
|
| description | The Case Mix Index (CMI) is the average relative DRG weight of a hospital’s inpatient discharges, calculated by summing the Medicare Severity-Diagnosis Related Group (MS-DRG) weight for each discharge and dividing the total by the number of discharges. The CMI reflects the diversity, clinical complexity, and resource needs of all the patients in the hospital. A higher CMI indicates a more complex and resource-intensive case load. Although the MS-DRG weights, provided by the Centers for Medicare & Medicaid Services (CMS), were designed for the Medicare population, they are applied here to all discharges regardless of payer. Note: It is not meaningful to add the CMI values together. |
| distribution |
[
{
"@type": "dcat:Distribution",
"title": "Case Mix Index-1996-2024",
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"describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=eea4bb35-3988-49bc-8a5b-b0b4c212fa15&limit=0",
"description": "The Case Mix Index (CMI) is the average relative DRG weight of a hospital’s inpatient discharges, calculated by summing the Medicare Severity-Diagnosis Related Group (MS-DRG) weight for each discharge and dividing the total by the number of discharges. The CMI reflects the diversity, clinical complexity, and resource needs of all the patients in the hospital. A higher CMI indicates a more complex and resource-intensive case load. Although the MS-DRG weights, provided by the Centers for Medicare & Medicaid Services (CMS), were designed for the Medicare population, they are applied here to all discharges regardless of payer. Note: It is not meaningful to add the CMI values together.",
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"describedByType": "application/json"
},
{
"@type": "dcat:Distribution",
"title": "Case Mix Index Calculation Example",
"format": "PDF",
"mediaType": "application/pdf",
"description": "Provides an example of how to use the Case Mix Index and the method to calculate it.",
"downloadURL": "https://data.chhs.ca.gov/dataset/5448f054-aa7f-4797-9de2-85767db93dff/resource/9a577735-3eb5-415d-9bb8-29e4a90fe5eb/download/cmiexamplecalculation.pdf"
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"description": "The Case Mix Index (CMI) is the average relative DRG weight of a hospital’s inpatient discharges, calculated by summing the Medicare Severity-Diagnosis Related Group (MS-DRG) weight for each discharge and dividing the total by the number of discharges. The CMI reflects the diversity, clinical complexity, and resource needs of all the patients in the hospital. A higher CMI indicates a more complex and resource-intensive case load. Although the MS-DRG weights, provided by the Centers for Medicare & Medicaid Services (CMS), were designed for the Medicare population, they are applied here to all discharges regardless of payer. Note: It is not meaningful to add the CMI values together.",
"downloadURL": "https://data.chhs.ca.gov/dataset/5448f054-aa7f-4797-9de2-85767db93dff/resource/5a04e554-8d37-4e81-9d6b-1170045bcc82/download/datadictionary-casemixindex.docx"
},
{
"@type": "dcat:Distribution",
"title": "All resource data",
"format": "ZIP",
"mediaType": "application/zip",
"downloadURL": "https://data.chhs.ca.gov/dataset/5448f054-aa7f-4797-9de2-85767db93dff/resource/d5cf4e0c-bbb3-4212-9af5-f69e8472ac81/download/case-mix-index-d6t7du37.zip"
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]
|
| identifier | 0f0f7d02-29a7-4688-ac7c-621a9392a2ca |
| issued | 2017-06-16T22:30:35.826295 |
| keyword |
[
"acuity",
"case mix index",
"cmi",
"department of health care access and information",
"diagnosis related group",
"drg",
"hcai",
"ms-drg",
"msdrg",
"weight"
]
|
| license | http://www.opendefinition.org/licenses/cc-by |
| modified | 2025-11-06T23:24:50.155459 |
| publisher |
{
"name": "Department of Health Care Access and Information",
"@type": "org:Organization"
}
|
| theme |
[
"Health and Human Services"
]
|
| title | Case Mix Index |
