Overview of the MedHopQA track at BioCreative IX: track description, participation and evaluation of systems for multi-hop medical question answering. - Rezarta Islamaj; Joey Chan; Robert Leaman; Jongmyung Jung; Hyeongsoon Hwang; Quoc-An Nguyen; Hoang-Quynh Le; Harikrishnan Gurushankar Saisudha; Ganesh Chandrasekar; Rustam R. Taktashov; Nadezhda Yu. Bizyukova; Sofia I. R. Conceição; et al. (CoRR, 2026)