Presbycusis

**Definition:** Gradual bilateral hearing loss associated with aging that is due to progressive degeneration of cochlear structures and central auditory pathways. Hearing loss usually begins with the high frequencies then progresses to sounds of middle and low frequencies.

**Tree numbers:** - C09.218.458.341.887.772 - C10.597.751.418.341.887.772 - C23.888.592.763.393.341.887.772