California Hospital Case Mix Index Data

Case Mix Index (CMI) data from the State of California's Department of Health Care Access and Information provides the average relative DRG weight for hospital inpatient discharges. The CMI reflects patient diversity, clinical complexity, and resource needs, calculated using Medicare Severity-Diagnosis Related Group (MS-DRG) weights from CMS applied to all discharges. The dataset was last updated in November 2025.

Use Cases

• Analyze hospital resource intensity and patient acuity by comparing CMI values across facilities.
• Examine the relationship between MS-DRG weights and hospital case complexity for operational planning.
• Benchmark hospital performance by studying the diversity and clinical complexity indicated by CMI.

Strengths

• Data is provided by the authoritative State of California Department of Health Care Access and Information (HCAI).
• The dataset was updated in November 2025, indicating recent maintenance.

Limitations

• Specific data volume (rows, columns) and temporal coverage are not documented.
• Data is provided in document formats (XLS, DOC, PDF, ZIP) which may require extraction and structuring for analysis.

Provenance

Source

State of California, Department of Health Care Access and Information (HCAI).

Collection Method

Calculated by summing the Medicare Severity-Diagnosis Related Group (MS-DRG) weight for each hospital discharge and dividing by the number of discharges.

Freshness

Last updated on 2025-11-23.

Geography

State of California, USA.