provides for a provider network, the negotiated rate for providers that participate in the network of such plan or coverage), may be changed only pursuant to a subsequent agreement signed by the doctor that documents the acknowledgment and acceptance of the doctor (as applicable) to such changes. (3) Duration of limited scope vision and dental plans In the case of an agreement between such a doctor and such a plan or coverage that offers limited scope dental or vision benefits, the agreement may only extend for a term beyond two years with the prior acceptance of the doctor for each term extension. (4) Terms and conditions for ancillary services and procedures Such plan or coverage may not deny such a doctor participation in the plan or coverage or remove such a doctor participation in the plan or coverage or remove such a doctor from participation in the plan or coverage for the sole reason of failure of the doctor to accept the terms and conditions under such agreement for any ancillary service or procedure. (5) Condition to join a provider network The plan or coverage may not require that such a doctor must participate with, or be credentialed by, any specific plan or coverage offering limited scope dental or vision benefits as a condition to participate in the provider network of such plan or coverage. (6) No interference with existing relationships and requirements Unless otherwise required by law or regulation, such plan or coverage may not directly communicate with an individual enrolled in such plan or coverage in a manner that interferes with or contravenes any State or Federal requirement, or doctor-patient relationship in existence at the time of such communication. (7) 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) Private right of action In addition