; and (B) the agreement may be extended for unlimited terms, subject to subparagraph (A). (3) No restrictions on choice of laboratories The plan or coverage may not, directly or indirectly, restrict or limit, such a doctor’s choice of laboratories or choice of source and suppliers of services or materials provided by the doctor to an individual who is enrolled under the plan or coverage. (b) Notification The Secretary shall on an annual basis notify each State of the State’s authority to enforce the provisions of subsection (a) against a group health plan or health insurance coverage described in subsection (a) pursuant to section 2723(a)(1) and request confirmation from the State whether or not the State will enforce the provisions of subsection (a). If a State notifies the Secretary that the State will not enforce the provisions of subsection (a) or fails to respond within 90 days of the Secretary’s request, the Secretary shall treat such State as failing to substantially enforce such provisions for purposes of subsections (a)(2) and (b) of section 2723. (c) Relationship to exception for limited, excepted benefits Section 2722(c)(1) shall not apply with respect to the requirements of this section. (d) Election To be excluded (1) In general If a doctor of optometry, doctor of dental surgery, or doctor of dental medicine to which the provisions of paragraphs (1) and (3) of subsection (a) otherwise apply makes an election under this paragraph (in such form and manner as the Secretary may by regulations prescribe), the requirements of such paragraphs insofar as they apply directly to the plan or coverage shall not apply to such plan or coverage for such period, as described in paragraph (2). (2) Period of election An election under paragraph (1)— (A) shall apply for a single specified plan year; (B) may be extended through subsequent elections under this subsection