Scope of Practice Is Not Portable: Diagnosis, Testing and What MFT Practice Means in Each State

Licensure portability gets most of the attention: which states have adopted Access MFTs, how endorsement works, whether a compact exists. Scope of practice gets less, and it catches experienced clinicians off guard. Getting a license in a second state answers the question of whether you may practice there. It does not answer what you may do once you are there.

Each state writes its own definition

Every state that licenses marriage and family therapists defines the practice in statute, often with more detail in board rules. There are 53 jurisdictions that license MFTs, counting the 50 states, DC, Guam and the Northern Mariana Islands, and the definitions do not match. Some are short and general, describing the application of psychotherapeutic and family systems theories to individuals, couples and families. Others list specific activities, populations or methods. Some explicitly include diagnosis and treatment of mental and emotional disorders, and others are quieter on the point.

When you practice under a state's license, the state's definition is the boundary. The American Association for Marriage and Family Therapy's view of the profession, your graduate training and the scope you enjoyed at home all matter for your competence, but none of them enlarge what the new state authorizes.

Diagnosis

Diagnostic authority is the scope question with the biggest practical consequences, because insurance billing usually depends on a diagnosis. In a number of states the MFT statute plainly authorizes diagnosis. In others the language is narrower, ties diagnosis to a particular level of licensure, or has changed through amendments that older summaries do not reflect.

Clinicians moving from a state with clear diagnostic authority tend to assume it everywhere. Before you bill an insurer for a client located in a new state, confirm that diagnosis falls within MFT scope there at your license level. If your practice relies on Medicare, where MFTs have been able to enroll as providers since January 1, 2024, the same check applies, because federal enrollment does not override state scope.

Assessment instruments

Testing is the second common gap. States handle it in different ways. Some MFT practice acts mention assessment broadly. Some states restrict the use of psychological tests to psychologists or to professionals whose statute names testing. Some rules distinguish between screening measures and standardized instruments that require interpretation.

Two separate questions sit underneath. The first is legal: does this state's law allow an MFT to administer and interpret this kind of instrument? The second is a qualification question set by test publishers, who assign user levels to their products. Meeting a publisher's qualification level does not settle the legal question, and legal authority does not satisfy a publisher's requirements. Check both.

Routine outcome measures and brief symptom screeners used in ordinary treatment are usually less contentious than personality inventories or cognitive testing, but do not assume. If you use a particular instrument regularly, name it when you ask the board.

Populations, settings and methods

Some practice acts also say something about who MFTs may serve or where. Questions come up around work with minors, custody-related evaluations, forensic work, supervision of other clinicians and practice in hospital settings. A few activities that MFTs perform in some states fall under other professions' statutes elsewhere.

Couples and family work itself is rarely the issue. The friction tends to appear at the edges: an evaluation for a court, a report written for a school, a recommendation that reads like a psychological opinion. Those are the places to slow down and read the statute.

Reading a practice act efficiently

You do not need a lawyer to get a useful first read. Find the state's MFT statute and the board's administrative rules. Look for the definitions section, which usually defines the practice of marriage and family therapy and the protected titles. Search for the words diagnose, diagnosis, assess, assessment, test and testing. Then check whether a separate psychology or testing statute limits the use of certain instruments by other professions.

If the state uses a composite board shared with counselors and social workers, make sure you are reading the MFT portion. Composite board rules often place the professions side by side, and it is easy to read the counselor or social work scope by mistake.

Confirming before you practice

When the text is ambiguous, write to the board. Describe the specific activity, such as administering and interpreting a named instrument or issuing a diagnosis for billing purposes, and ask whether it falls within MFT scope at your license level. Boards vary in how willing they are to give opinions, and some will simply point you back to the statute, but a written question and any answer belong in your records.

Also check with your malpractice carrier. Coverage is often written in terms of services within the scope of your license, so an activity outside scope in a given state may also be outside coverage.

Telehealth and multistate caseloads

For telehealth, the client's physical location at the time of the session determines which state's license is required, and with it which state's scope applies. A clinician licensed in three states may be working under three different scopes in the same afternoon. Build that into your intake: record the client's location, note which license you are relying on, and keep a short reference for each state on the handful of scope questions your practice actually touches.

Streamlined endorsement under Access MFTs has made it easier to add states. It has not made those states alike. The license is the permission. The scope is the set of terms, and it is worth reading before you sign on.