Can PT students bill Medicare? Rules for students and aides

The final clinical rotation in a DPT program now averages 20.8 weeks, according to CAPTE’s 2024 fact sheet on physical therapist education programs. That is close to five months of a student in your gym. Somewhere in week one the clinical instructor asks the question a private practice owner eventually has to answer: when the student treats, what do we bill?

The answer lives in a section of the Medicare Benefit Policy Manual that carries a December 2006 revision date, inside a chapter CMS reissued on May 8, 2026. The rule is short. It is also the kind of rule that gets bent on the Thursday two PTs are out sick and the student is plainly good enough to run a session alone.

Can a PT student’s services be billed to Medicare Part B?

No. Chapter 15 of the Medicare Benefit Policy Manual says it in one sentence: “Only the services of the therapist can be billed and paid under Medicare Part B.” Student services “are not reimbursed even if provided under ‘line of sight’ supervision of the therapist.” The reason is structural. Part B pays practitioners authorized by statute, and in the manual’s words, “students do not meet the definition of practitioners under Medicare Part B.” Under Part B the student is not a biller at all.

The same paragraph adds the clause that keeps clinical education alive in outpatient settings: “the presence of the student ‘in the room’ does not make the service unbillable.” You can still bill your own one-on-one time with a student at the table beside you. What you cannot do is bill the student’s time as yours.

The manual also notes that Part A settings such as skilled nursing facilities pay on a different basis. A habit learned on a SNF rotation does not transfer to an outpatient schedule.

When can you bill with a student in the room?

You can bill when you are delivering the service and the student is participating in it, and not the reverse. Noridian’s Part B article on therapy students and aides, last updated August 21, 2025, restates the manual’s three conditions. In the manual’s words:

1. “The qualified practitioner is present and in the room for the entire session.” The student participates “when the qualified practitioner is directing the service, making the skilled judgment, and is responsible for the assessment and treatment.”
2. The practitioner “is not engaged in treating another patient or doing other tasks at the same time.”
3. The practitioner “is responsible for the services and as such, signs all documentation.” A student may co-sign. The manual says it is not necessary, because “the Part B payment is for the clinician’s service, not for the student’s services.”

Two working tests make those conditions usable at 4:40 on a Thursday. The first is APTA guidance reproduced in APTA Wisconsin’s clinical education FAQ on Part B students: ask “whether the billing would be the same whether or not there is a student involved.” The FAQ adds that “the individual PT or the employer should not benefit financially from having the student involved.” If the student’s presence lets you go see a second patient down the hall, the visit you walked away from is the one you do not bill.

The second test is the note. The same FAQ recommends recording which services were delivered under the PT’s direct supervision and which were not, and keeping the claim consistent with that record. A student can still treat a Medicare patient when you step out, provided your state practice act allows it. The care gets documented. It does not get billed.

Can a PTA serve as the clinical instructor?

Under Medicare, yes. The manual says physical therapist assistants “are not precluded from serving as clinical instructors for therapy students.” The condition is that the services stay within the PTA’s scope and are “performed under the direction and supervision of a licensed physical or occupational therapist.” The state board sets the floor above that. Wisconsin’s practice act, as the APTA Wisconsin FAQ reads it, exempts students from licensure only while they assist “under the direct, on-premises supervision of the physical therapist” and within the scope of their training. The FAQ reads that to mean a PTA can instruct a PTA student while the PT stays on the premises. Your state may read it differently. The PTA side of the capacity math is its own subject, covered in PTA supervision requirements.

What can a PT aide do, and can you bill it?

You can use aides. You cannot bill their minutes. The manual is flat about it: “Services provided by aides, even if under the supervision of a therapist, are not therapy services and are not covered by Medicare.” Unskilled minutes billed as therapy “shall be denied as not reasonable and necessary.” Noridian’s article turns that into arithmetic. A patient works in the gym with the aide for 15 minutes, gets 20 minutes of direct treatment from the therapist, then works another 15 minutes with the aide. Noridian’s verdict: “Total of 20 individual minutes of service were provided by the qualified clinician and are billable for the session.” Fifty minutes in the building, twenty on the claim.

State boards decide what the aide may touch during the other thirty. California’s regulation on the use of physical therapy aides requires “continuous and immediate supervision.” The PT must be “in the same facility as the aide and in immediate proximity to the location where the aide is performing patient related tasks.” Before an aide performs any patient-related task, the PT “shall evaluate and document, the aide’s competency level for performing the patient related task.” Georgia’s rules on physical therapy aides require “direct supervision on the premises at all times,” allow a licensee to oversee at most two aides during patient evaluation and intervention, and let an aide transcribe treatment documentation if the supervising PT or PTA signs it. Other states draw the lines elsewhere. If your aide competency checks exist as a conversation and nothing more, a chart audit will treat them as if they never happened.

Is hosting a student worth it for a private practice?

The clinic-side answer is split down the middle. The American Council of Academic Physical Therapy’s task force report on clinical education placement capacity, published April 3, 2024, surveyed site coordinators of clinical education, the people who manage student placements on the clinic side. The outpatient survey went out July 5, 2023. Of the 1,698 coordinators who responded, 1,471 agreed to be included, and 28% of that sample primarily managed a private practice. Asked about capacity, 43% said they could accept more students and 35% said they were full. The most frequently selected barrier was capital resources, meaning space, desks and technology. The barrier ranked most impactful was willingness to serve as a clinical instructor, and in the open-ended responses, outpatient participants “suggested that reimbursement challenges negatively impacted their capacity.” The incentives respondents suggested included lower productivity expectations, extra pay and continuing education.

Read that against the Part B rule and the economics are honest, if unflattering. A student costs a clinical instructor’s attention, and Medicare will not let the student’s hands pay for it. The case for hosting anyway is the pipeline. CAPTE counted 39,448 DPT students enrolled for 2024-25, spread across 292 accredited programs and 25 more seeking accreditation, and those programs need clinics to place them in. With the physical therapist shortage running through 2027, the student who spends five months in your clinic is the candidate you will not have to recruit.

So the decision gets made in the schedule. Build the instructor’s template so their billable column stays one patient at a time while the student is on it. Give the student’s solo sessions their own visit type, so the note and the claim agree without anyone remembering to fix it later. Put the aide competency sign-offs somewhere a reviewer can find them. Provider and room rules of that kind are what Orion’s scheduling is built around, and they are the difference between a rotation that teaches and a rotation that ends in a repayment letter.

Medicare has had two decades to rewrite the student rule and has not. Plan the rotation as though it never will: the student learns, the patient gets two sets of eyes, and the claim is for the minutes you were in the room.