Improving the sensitivity and specificity of the abbreviated injury scale coding system

Area of Science:

• Traumatology
• Epidemiology
• Medical Coding

Background:

• The standard Abbreviated Injury Scale (AIS 85) has limitations in coding specific anatomic injury details from medical records.
• A significant portion of motor vehicle trauma cases (68%) were coded to a nonspecific "external" category using AIS 85.

Purpose of the Study:

• To introduce and evaluate the Abbreviated Injury Scale with Epidemiologic Modifications (AIS 85-EM) for enhanced injury coding.
• To assess the impact of AIS 85-EM on the specificity of coding anatomic injury types and locations.

Main Methods:

• Utilized a population-based sample of 3,223 motor vehicle trauma cases.
• Compared injury coding results between the standard AIS 85 and the modified AIS 85-EM procedures.
• Analyzed the proportion of injuries coded to specific body regions and the "external" category.

Main Results:

• AIS 85-EM reduced the proportion of uncodable injuries from 68% to 15%.
• The coding of head injuries increased from 16% to 37% with AIS 85-EM, improving identification of head and brain injuries.
• Increased body region specificity was achieved for all injury types.

Conclusions:

• AIS 85-EM provides more specific body region coding for motor vehicle trauma injuries compared to AIS 85.
• Accurate body region coding is essential for reliable analysis of injury patterns and outcomes.
• Enhanced specificity improves the assessment of injury prevention strategies and countermeasures.