Validation of a Large Language Model Enhanced Frailty Index. - Joseph M. Plasek; Marie Leeson; John Lundstedt; Natalie C. Ernecoff; Julie M. Fiskio; Savanna Plombon; Shoshana Streiter; Stephanie Mueller; Stuart R. Lipsitz; Julia V. Loewenthal; Li Zhou 007; Anuj K. Dalal (J. Medical Syst., 2026)