Torsion of appendix testis

This code describes the twisting of the appendix testis, a small vestigial remnant on the upper pole of the testis, leading to acute scrotal pain. This condition is a common cause of acute scrotum in prepubertal boys, often mimicking testicular torsion.

Use this code when documentation confirms torsion of the appendix testis, typically diagnosed clinically based on localized pain, a "blue dot sign," and often confirmed by scrotal ultrasound showing normal testicular blood flow. This code is appropriate for cases where surgical exploration confirms appendix testis torsion or when clinical diagnosis is definitive without surgical intervention.

• Differentiate carefully from testicular torsion (N46.1-), which is a surgical emergency involving the entire testis.
• Ensure documentation specifies "appendix testis" to avoid confusion with other scrotal pathologies.
• Consider using additional codes for associated symptoms like scrotal pain (R10.84) if not inherent to the primary diagnosis.