Parentheses that are located next to the main term and enclose supplementary words in the Alphabetic Index are referred to as essential modifiers.

Question

Quizplus · Accepted Answer

Parentheses in the Alphabetic Index that enclose supplementary words next to the main term are referred to as nonessential modifiers, indicating that the information within the parentheses is not required to assign a code but can provide additional context. Essential modifiers, which directly affect code selection, are typically listed outside of parentheses.

Parentheses That Are Located Next to the Main Term and Enclose