A medical service corporation shall not refuse to contract with or compensate for covered services an otherwise eligible provider solely because such provider has in good faith communicated with one or more of his current, former or prospective patients regarding the provisions, terms or requirements of the medical service corporation’s products as they relate to the needs of such provder’s patients. No participating physician or other participating provider of health services shall charge to or collect from a subscriber or covered dependent any amount in excess of the amount of compensation determined and allowed by a medical service corporation pursuant to the applicable method of compensation approved by the commissioner. See definition section Mass. Gen. Laws ch. 176B, § 1.