Massachusetts General Laws Part III. Courts, Judicial Officers and Proceedings in Civil Cases (Ch. 211-262) Ch. 231, § 60I

Attorney fees for services rendered on behalf of a claimant or defendant in a medical negligence case shall be fair and reasonable. An attorney representing a claimant may charge a client a contingency fee, which shall be subject to the rules and guidelines of the supreme judicial court. No contingent fee agreement, shall be enforced, and no attorney shall recover a fee thereunder, as a result of services rendered in an action against a provider of health care for malpractice, negligence, error, omission, mistake, or the unauthorized rendering of professional services if, at the time of judgment, the court determines that the amount of the recovery paid or to be paid to the plaintiff, after deduction of the attorney's reasonable expenses and disbursements for which the plaintiff is liable and the amount of the attorney's fee, is less than the total amount of the plaintiff's unpaid past and future medical expenses included in the recovery, unless the contingent attorney's fee: (a) is twenty per cent or less of the plaintiff's recovery; (b) is reduced to twenty per cent or less of the plaintiff's recovery; or (c) is reduced to a level which permits the plaintiff to be paid his unpaid past and future medical expenses included in the recovery.

An attorney shall not contract for or collect a contingent fee for representing any person seeking damages in connection with an action for malpractice, negligence, error, omission, mistake, or the unauthorized rendering of professional services against a provider of health care in excess of the following limits: