[Sioux City ENT - Ear, Nose, and Throat Doctors in Sioux City, IA Dr. David V. Wagner is an otolaryngologist in Sioux City IA specializing in diseases and disorders of the head and neck, most commonly the ears, nose and throat. Dr. David V. Wagner diagnoses and treats head and throat problems such as sinusitis, sleep apnea, allergies, outer ear infections, dizziness, laryngitis, and hearing loss.]