(a) The basic benefits required under this subchapter shall not be subject to a deductible, coinsurance, or copayment requirement that exceeds the applicable deductible, coinsurance, or copayment applicable to other analogous chronic medical conditions or other similar benefits provided under the plan.(b) No more than one copayment shall be charged for a thirty-day supply of any item of diabetes supplies listed in §21.2605 of this title (relating to Diabetes Equipment and Supplies). The amount of supplies that constitutes a thirty-day supply for an insured is the amount prescribed as a thirty-day supply by the physician or practitioner of the insured.