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Objective: To assess the accuracy of a large language model (LLM) in measuring clinician adherence to practice guidelines for monitoring side effects after prescribing medications for children with attention-deficit/hyperactivity disorder (ADHD)., Methods: Retrospective population-based cohort study of electronic health records. Cohort included children aged 6 to 11 years with ADHD diagnosis and 2 or more ADHD medication encounters (stimulants or nonstimulants prescribed) between 2015 and 2022 in a community-based primary health care network (n = 1201). To identify documentation of side effects inquiry, we trained, tested, and deployed an open-source LLM (LLaMA) on all clinical notes from ADHD-related encounters (ADHD diagnosis or ADHD medication prescription), including in-clinic/telehealth and telephone encounters (n = 15 628 notes). Model performance was assessed using holdout and deployment test sets, compared with manual medical record review., Results: The LLaMA model accurately classified notes that contained side effects inquiry (sensitivity = 87.2, specificity = 86.3, area under curve = 0.93 on holdout test set). Analyses revealed no model bias in relation to patient sex or insurance. Mean age (SD) at first prescription was 8.8 (1.6) years; characteristics were mostly similar across patients with and without documented side effects inquiry. Rates of documented side effects inquiry were lower for telephone encounters than for in-clinic/telehealth encounters (51.9% vs 73.0%, P < .001). Side effects inquiry was documented in 61.4% of encounters after stimulant prescriptions and 48.5% of encounters after nonstimulant prescriptions (P = .041)., Conclusions: Deploying an LLM on a variable set of clinical notes, including telephone notes, offered scalable measurement of quality of care and uncovered opportunities to improve psychopharmacological medication management in primary care., (Copyright © 2024 by the American Academy of Pediatrics.)