AbstractChemotherapy‐induced peripheral neuropathy (CIPN), a common condition in children with acute lymphoblastic leukemia, can be challenging to diagnose. Using data from Children's Oncology Group AALL0932 physical function study, we sought to determine if parent/guardian proxy‐reported responses from the Pediatric Outcomes Data Collection Instrument could identify children with motor or sensory CIPN diagnosed by physical/occupational therapists (PT/OT). Four variables moderately discriminated between children with and without motor CIPN (c‐index 0.76, 95% confidence interval [CI]: 0.64–0.84), but sensory and optimism‐corrected models had weak discrimination (c‐index sensory models 0.65, 95% CI: 0.54–0.74). New proxy‐report measures are needed to identify children with PT/OT diagnosed CIPN.