Section 18 Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; clocks and watches; musical instruments; parts and accessories thereof 90 Optical, photographic, cinematographic, measuring, checking, precision, me Thereof. 90 21 Orthopaedic appliances, including crutches, surgical belts and trusses; splints and other fracture appliances; artificial parts of the body; hearing aids and other appliances which are worn or carried, or implanted in the body, to compensate for a defect or disability Commodity Code Description 90 21 10 - Orthopaedic or fracture appliances 90 21 21 - - Artificial teeth 90 21 29 - - Other 90 21 31 - - Artificial joints 90 21 39 - - Other 90 21 40 - Hearing aids, excluding parts and accessories 90 21 50 - Pacemakers for stimulating heart muscles, excluding parts and accessories 90 21 90 - Other