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.
FFS requires PA for second and third year treatment and retention. If the. patient was approved through FFS all prior approvals and payments will continue. FFS to the completion of the approved course of orthodontic treatment. Near the. end of the approved period of service, a new prior approval request will need to. be submitted for approval for continuation of care.