; (2) when the provider terminates a network agreement with a plan or with an issuer with respect to certain coverage; (3) when there are material changes to the content of provider directory information described in subsection (a)(1); and (4) every 90 days throughout the duration of the network agreement with a plan or issuer. (d) Enforcement (1) In general Subject to paragraph (2), a health care provider that violates a requirement under subsection (c) or takes actions that prevent a group health plan or health insurance issuer from complying with subsection (a)(1) or (b) shall be subject to a civil monetary penalty of not more than $10,000 for each act constituting such violation. (2) Safe harbor The Secretary may waive the penalty described under paragraph (1) with respect to a health care provider that unknowingly violates subsection (b)(1) with respect to an enrollee if such provider rescinds the bill involved and, if applicable, reimburses the enrollee within 30 days of the date on which the provider billed the enrollee in violation of such subsection. (3) Procedure The provisions of section 1128A of the Social Security Act, other than subsections (a) and (b) and the first sentence of subsection (c)(1) of such section, shall apply to civil money penalties under this subsection in the same manner as such provisions apply to a penalty or proceeding under section 1128A of the Social Security Act. (e) Savings clause Nothing in this section shall prohibit a provider from requiring in the terms of a contract, or contract termination, with a group health plan or health insurance issuer— (1) that the plan or issuer remove, at the time of termination of such contract, the provider from a directory of the plan or issuer described in subsection (a)(1)