Primary Care and Emergency Room Visits: The Virginia All-Payer Claims Database

Area of Science:

• Health Services Research
• Public Health
• Geographic Health Analysis

Background:

• Investigates the relationship between primary care utilization and emergency department (ER) use.
• Examines geographic variations in primary care and ER utilization across Virginia using the all-payer claims database (APCD).

Purpose of the Study:

• To determine the association between primary care utilization and emergency department (ER) use.
• To explore geographic patterns in primary care and ER utilization within Virginia.

Main Methods:

• Retrospective observational analysis of the Virginia all-payer claims database (APCD).
• Employed Bayesian smoothing techniques, regression analysis, and Geographic Information System (GIS) mapping.
• Analysis covered 866 ZIP Code Tabulation Areas (ZCTAs) in Virginia.

Main Results:

• A significant inverse relationship was found: a 10-visit increase in primary care rates per 1,000 population correlated with a 7-visit decrease in ER use rates per 1,000.
• GIS mapping identified clusters of high primary care utilization in central and eastern Virginia, with lower rates in southern Virginia.
• Higher ER use rates were observed in western Virginia, with lower rates concentrated in northern Virginia.

Conclusions:

• Primary care utilization is associated with reduced emergency department use, supported by APCD data and GIS mapping.
• Distinct geographic patterns in both primary care and ER utilization were evident across Virginia.
• Future research should identify priority areas, analyze their characteristics, and conduct qualitative studies to understand local factors influencing these utilization rates.