9021.90 - Other:

This HTS category, 9021.90, encompasses "Other" medical and surgical instruments and apparatus designed to compensate for a defect or disability. It serves as a residual category for items within heading 9021 that are not specifically enumerated in the preceding subheadings. This includes a broad range of appliances worn, carried, or implanted to aid individuals with physical impairments.

Crucially, 9021.90 is distinct from its sibling categories. It does not cover orthopedic or fracture appliances (9021.10), artificial teeth and dental fittings (9021.21/29), hearing aids (9021.40), or pacemakers (9021.50). Instead, it captures items that fall under the general scope of compensating for defects or disabilities but lack a more precise classification elsewhere within heading 9021.

Within this category, further distinctions are made. Subheading 9021.90.40 specifically addresses parts and accessories for hearing aids and pacemakers, ensuring that components for these already defined devices are correctly classified. The residual subheading 9021.90.81.00 then captures all remaining items that fit the general description of "other" compensating appliances, ensuring comprehensive coverage within the heading.