This collection consists of phenotypic cohort definitions for patients with diseases affecting the brain, spinal cord, and peripheral nerves, leading to neurological deficits or altered function. This category includes seizure disorders, neuromuscular conditions, and neurodevelopmental or degenerative diseases. Phenotype logic may incorporate diagnosis codes, EEG or neuroimaging findings, medication use (e.g., antiepileptics), and specialty care indicators (e.g., neurology visits). Functional assessments and developmental milestone tracking may also be used. Example phenotypes include “Epilepsy,” often defined by diagnosis codes, anti-seizure medications, and EEG data, and “Cerebral Palsy,” defined through diagnostic history, motor function assessments, and rehabilitation therapy use.