Sec1860D-43[42 U.S.C. 1395w-153] (a) In General.—In order for coverage to be available under this part for covered part D drugs (as defined in section 1860D–2(e)) of a manufacturer, the manufacturer must—

(1) participate in the Medicare coverage gap discount program under section 1860D–14A;

(2) have entered into and have in effect an agreement described in subsection (b) of such section with the Secretary; and

(3) have entered into and have in effect, under terms and conditions specified by the Secretary, a contract with a third party that the Secretary has entered into a contract with under subsection (d)(3) of such section.

(b) Effective Date.—Subsection (a) shall apply to covered part D drugs dispensed under this part on or after January 1, 2011.

(c) Authorizing Coverage for Drugs Not Covered Under Agreements.—Subsection (a) shall not apply to the dispensing of a covered part D drug if—

(1) the Secretary has made a determination that the availability of the drug is essential to the health of beneficiaries under this part; or

(2) the Secretary determines that in the period beginning on January 1, 2011, and December 31, 2011, there were extenuating circumstances.

(d) Definition of Manufacturer.—In this section, the term “manufacturer” has the meaning given such term in section 1860D–14A(g)(5).