When coding the phrase acute enlarged cervical lymph nodes the main term to reference in the index is?

When coding the phrase "acute enlarged cervical lymph nodes," the main term to reference in the index is "lymph nodes." You would look up "lymph nodes" in the index, which would then guide you to the appropriate code for the condition, including any necessary modifiers for "acute" and "enlarged." If applicable, you may also need to consider the specific location (cervical) when determining the final code.