This collection consists of phenotypic cohort definitions for patients with diseases affecting the ear, nose, throat (ENT), and related head and neck structures. This includes infections (e.g., otitis media), congenital anomalies (e.g., cleft palate), and functional disorders (e.g., sleep apnea). Phenotype logic may rely on diagnostic codes, procedural data (e.g., tympanostomy tube placement, tonsillectomy), audiometric testing, and referrals to ENT specialists. Example phenotypes include “Recurrent Otitis Media,” defined by multiple episodes within a defined time window and procedural interventions, and “Obstructive Sleep Apnea,” which may be captured using sleep study data and treatment with CPAP or surgery.