15. Only an orthosis that is furnished to an insured person on the written prescription of a physician referred to in this Title whose contents meet the requirements of section 28 is insured where the insured person must wear the orthosis on a daily basis for at least the following length of time:
(1) 6 months for a lower-limb orthosis;
(2) 1 month for an upper-limb orthosis; and
(3) 3 months for a trunk orthosis.
Notwithstanding the foregoing, an orthosis that is furnished to an insured person under the age of 19 shall remain an insured orthosis even if it has not been determined that he is required to wear it daily for the full length of time stated in the first paragraph, provided the insured person is required to wear the orthosis to correct a deformity.