An act that may only be performed by authorized providers is referred to as a:

A controlled act is a specific type of medical procedure or intervention that can only be performed by individuals who have been given the legal authority to do so, often regulated by professional licensing bodies. The concept of controlled acts is central to ensuring patient safety and maintaining a standard of care within the healthcare system.

These acts are often defined by law and are designed to protect the public from unqualified practitioners. Examples of controlled acts include administering certain medications, performing surgeries, or making diagnoses. Only those who are deemed qualified, such as licensed healthcare professionals, have the right to carry out these procedures. The enforcement of controlled acts helps to regulate practice and ensure that patients receive care from individuals who are properly trained and accountable.

In contrast, the other choices refer to different concepts: an authorization act may involve granting permission but doesn't specifically delineate who can perform certain acts; a fiduciary act relates to the obligations of trust and responsibility between parties; while a medically necessary act pertains to treatments required to maintain health but does not inherently limit the performers to only authorized providers. This clarity around who can perform controlled acts is crucial for professional healthcare practice and patient safety.