Case Mix Index
type: Dataset
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.
keyword: acuity
keyword: amerigeo
keyword: amerigeoss
keyword: case-mix-index
keyword: ckan
keyword: cmi
keyword: department-of-health-care-access-and-information
keyword: diagnosis-related-group
keyword: drg
keyword: geo
keyword: geoss
keyword: hcai
keyword: ms-drg
keyword: msdrg
keyword: national
keyword: north-america
keyword: united-states
keyword: weight
issued: 2017-06-16T22:30:35.826295
modified: 2022-04-22T15:28:18.891419
theme: {"Health and Human Services"}
contact point: Organization
  fn: Department of Health Care Access and Information, Healthcare Analytics Branch

US Migrating
type: Agent

Case Mix Index-1996-2020
type: Distribution
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.
media type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
format: XLS
access URL: https://data.chhs.ca.gov/dataset/5448f054-aa7f-4797-9de2-85767db93dff/resource/3ed58730-7dbb-4a48-bae5-0e66929c44f7/download/casemixindex_1996_2020.xlsx
issued: 2022-04-28T01:58:01.004002
modified: 2025-11-22T09:01:25.054241

data-dictionary-case-mix-index
type: Distribution
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.
media type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
format: DOC
access URL: https://data.chhs.ca.gov/dataset/5448f054-aa7f-4797-9de2-85767db93dff/resource/5a04e554-8d37-4e81-9d6b-1170045bcc82/download/datadictionary-casemixindex.docx
issued: 2022-04-28T01:58:01.004013
modified: 2025-11-22T09:01:25.054676

Case Mix Index Calculation Example
type: Distribution
description: Provides an example of how to use the Case Mix Index and the method to calculate it.
media type: application/pdf
format: PDF
access URL: https://data.chhs.ca.gov/dataset/5448f054-aa7f-4797-9de2-85767db93dff/resource/9a577735-3eb5-415d-9bb8-29e4a90fe5eb/download/cmiexamplecalculation.pdf
issued: 2022-04-28T01:58:01.004020
modified: 2025-11-22T09:01:25.055078

All resource data
type: Distribution
description: case-mix-index-ctxksz.zip
media type: application/zip
format: ZIP
access URL: https://data.chhs.ca.gov/dataset/5448f054-aa7f-4797-9de2-85767db93dff/resource/d5cf4e0c-bbb3-4212-9af5-f69e8472ac81/download/case-mix-index-ctxksz.zip
issued: 2022-04-28T01:58:01.004025
modified: 2025-11-22T09:01:25.055466