1 If X is a topological (or metric) space and M is a metric space, then the set of all bounded continuous functions from X to M forms a metric space if we define the metric as above: d (f, g) = sup x in X d (f (x), g (x)) for any bounded continuous functions f and g.
Invisalign is orthodontic appliance, so since orthodontic treatment is allowed as an FSA expense, Invisalign is covered. Different companies have different rules concerning amounts set aside and the timing of how funds are used for orthodontics.
Brace sleeves (A9270) used in conjunction with orthoses are non-covered because they are not used to support a weak or deformed body member or to restrict or eliminate motion in a diseased or injured part of the body (i.e., it does not meet the definition of a brace).t must provide support and counterforce (i.e., a force in a defined direction of a magnitude at least as great as a rigid or semi-rigid support) on the limb or body part that it is being used to brace. An orthosis can be either prefabricated or custom-fabricated.