California Independent Medical Review Determinations Since 2001

Independent Medical Review (IMR) decisions from the California Department of Managed Health Care, covering all determinations administered since January 1, 2001. The dataset documents reviews of health plan denials for services deemed not medically necessary, experimental, or non-urgent.

Use Cases

• Analyze trends in IMR decision outcomes to identify patterns in health plan denials overturned in the enrollee's favor.
• Model the likelihood of a service authorization based on review characteristics like the service type or denial reason.
• Assess the volume and outcomes of reviews concerning experimental or investigational treatment requests.

Strengths

• Data covers over two decades of medical review decisions, starting from January 1, 2001.
• Sourced from the authoritative state regulator, the California Department of Managed Health Care (DMHC).
• Includes all IMR decisions administered by the DMHC, providing a complete regulatory record.

Limitations

• Specific data volume (row count) and feature details (columns) are not provided in the input.
• Data is provided in multiple formats (PDF, CSV, ZIP), which may require consolidation and parsing.
• Focus is exclusively on California, limiting geographic generalizability.

Provenance

Source

California Department of Managed Health Care (DMHC).

Collection Method

Administrative collection of all Independent Medical Review decisions.

Time Range

January 1, 2001 onward.

Freshness

Last updated March 23, 2026.

Geography

California, United States.