All fees will be stated in terms of hourly amounts unless it is a reasonable or common practice to do otherwise, e.g., a fee for a diagnostic evaluation including the administration of a battery of tests; a per diem consulting fee.
A psychologist must specify with each potential patient or client which of the advertised services will be performed for that patient or client, and by whom. A psychologist must perform fully all advertised services at the amounts which they are advertised and must otherwise comply with all representations contained in any advertisement. A psychologist must maintain in a place of prominent display in his or her office the fee schedule appearing in his or her most recent advertisement. If because of unforeseen circumstances a psychologist cannot reasonably charge the advertised amount, the psychologist must so inform all parties directly involved and obtain their written consent prior to performing services at higher than the advertised amount.
251 CMR, § 1.10