A provider of services may charge such individual or other person (i) the amount of any deduction or coinsurance amount imposed pursuant to section 1395e(a)(1), (a)(3), or (a)(4), section 1395
l(b), or
section 1395x(y)(3) of this title with respect to such items and services (not in excess of the amount customarily charged for such items and services by such provider), and (ii) an amount equal to 20 per centum of the reasonable charges for such items and services (not in excess of 20 per centum of the amount customarily charged for such items and services by such provider) for which payment is made under part B or which are durable medical equipment furnished as home health services (but in the case of items and services furnished to individuals with end-stage renal disease, an amount equal to 20 percent of the estimated amounts for such items and services calculated on the basis established by the Secretary). In the case of items and services described in section 1395
l(c) of this title, clause (ii) of the preceding sentence shall be applied by substituting for 20 percent the proportion which is appropriate under such section. A provider of services may not impose a charge under clause (ii) of the first sentence of this subparagraph with respect to items and services described in
section 1395x(s)(10)(A) of this title and with respect to clinical diagnostic laboratory tests for which payment is made under part B. Notwithstanding the first sentence of this subparagraph, a home health agency may charge such an individual or person, with respect to covered items subject to payment under
section 1395m(a) of this title, the amount of any deduction imposed under section 1395
l(b) of this title and 20 percent of the payment basis described in
section 1395m(a)(1)(B) of this title. In the case of items and services for which payment is made under part B under the prospective payment system established under section 1395
l(t) of this title, clause (ii) of the first sentence shall be applied by substituting for 20 percent of the reasonable charge, the applicable copayment amount established under section 1395
l(t)(5)
1 of this title. In the case of services described in section 1395
l(a)(8) of this title or section 1395
l(a)(9) of this title for which payment is made under part B under
section 1395m(k) of this title, clause (ii) of the first sentence shall be applied by substituting for 20 percent of the reasonable charge for such services 20 percent of the lesser of the actual charge or the applicable fee schedule amount (as defined in such section) for such services.