兰德-Access-to-Medical-Treatment-for-Injured-Workers-in-California_-Year-1-Annual-Report_74页_1mb

Summary of Access to Medical Treatment for Injured Workers in California

Core Content

This report is the first annual assessment of access to medical care for injured workers in California, commissioned by the Department of Industrial Relations (DIR) under California Labor Code Section 5307.2. It evaluates the impact of policy changes, particularly those introduced by Senate Bill (SB) 863 in 2012, on the availability, utilization, and timeliness of medical services for injured workers.

The study utilizes data from the Workers' Compensation Information System (WCIS), which collects comprehensive information on WC claims and related medical billing. The report focuses on three key dimensions of access: provider participation, utilization and payments per provider, and utilization and payments per injury. It also examines timeliness of care and provider churn, as well as the pathways of care that injured workers follow.

Main Findings

Provider Participation

• The number of providers treating injured workers decreased from 2010 to 2014.
• Family medicine/general practice, chiropractic medicine, and pharmacy providers saw the largest declines.
• Physical therapists and other providers experienced increases.
• The overall number of WC injuries increased during the same period, which may have been expected to increase provider participation, but this was not observed.

Utilization and Payments per Provider

• The average number of claims per provider increased from 47 in 2010 to 59 in 2014.
• The average number of bill lines (medical services) per provider increased from 474 to 540.
• Payments per provider increased by $8,813 on average.
• Occupational medicine showed a statistically significant increase in claims per provider.
• The median values for claims, bill lines, and payments per provider remained relatively stable (2 claims, 12 bill lines, and $8,813 payments respectively).

Utilization and Payments per Injury

• Utilization of medical services declined for most service categories from 2010 to 2014.
• Payments per injury increased for evaluation and management (E&M) services but decreased for most other services.
• These changes could be influenced by SB 863 reforms, such as the transition to a resource-based relative value scale (RBRVS), but further research is needed to confirm causality.

Timeliness of Care

• The median wait time from injury to first E&M visit increased slightly from 2 days in 2010 to 3 days in 2014.
• Northern and Southern California showed similar trends, but timeliness varied by injury type.
• Compared to other states, such as Texas, California's system was more timely, though the increase in wait times suggests a potential concern.

Provider Churn

• Primary care provider (PCP) churn decreased from 2010 to 2014.
• The average number of PCPs seen per injured worker in the first year after injury slightly declined from 1.24 to 1.21.
• Most injured workers had stable patterns of PCP use across injury types.

Pathways of Care

• 61–65% of injured workers had their first visit with a PCP for an E&M service, a relatively stable pattern.
• A small percentage of injured workers had their first visit in an emergency room (ED), and most of these did not require inpatient admission.
• Specialist pathways showed longer wait times between visits, with the second visit occurring around 4–5 days after the initial E&M visit and the third visit around 10–13 days later.
• Utilization increased over time in most pathways, indicating a potential trend toward more frequent medical care.

Key Information

• SB 863 introduced significant changes to the WC system, including new fee schedules, medical-necessity determination processes, and monitoring of medical provider networks (MPNs).
• Access to care is defined as the opportunity and ease of obtaining health care services in proportion to need, and can be measured through utilization, timeliness, and provider availability.
• The use of administrative and billing data provides a limited but useful view of access, as it cannot capture patient satisfaction or provider perceptions.
• The transition to RBRVS may have influenced payment trends, particularly for E&M services.
• The lack of a consistent individual-practitioner identifier (such as NPI) is a major limitation in the analysis, as it leads to heterogeneity in data across providers.

Limitations

• The use of Taxpayer Identification Number (TIN) as a provider identifier results in heterogeneous data across different types of providers (e.g., solo practices vs. large health systems).
• Not all claims are reported into the WCIS, and initial medical visits and medical bills are underreported.
• Access measures are not exhaustive, and other proxies (e.g., patient satisfaction, provider perceptions) are not captured in the data.
• Statistical significance was lost for some trends when adjusting for multiple comparisons.

Recommendations

• Future reports should include survey data from physicians and analysis of MPN listings to better understand provider behavior and network dynamics.
• The introduction of NPI in the most recent WCIS release will improve the accuracy of future analyses.
• Continued monitoring of timeliness, utilization, and provider participation is essential to ensure adequate access to care for injured workers and to support better health outcomes.

Conclusion

The report highlights that while access to care for injured workers in California remains relatively stable, there are subtle changes in provider participation, utilization, and payments that warrant further investigation. The timeliness of care is comparatively good, and most injured workers follow appropriate care pathways. However, the lack of a consistent identifier and data limitations pose challenges for comprehensive analysis. Future studies should expand on these findings with additional data sources and more refined measures.