A supervising physician’s name on a claim settles three questions at once: who was allowed to treat the patient, what the service pays, and whether the record can prove it. Most practices answer the first two by habit and meet the third during an audit. The requirements differ by clinician type, by setting and by payer, and they stack in a fixed order: state law first, Medicare second, the commercial contract last.
What this covers
- Direct supervision means a physician is in the office suite and immediately available, not standing in the exam room.
- An NPP visit billed incident to pays 100 percent of the fee schedule. The same visit under the NPP’s own NPI pays 85 percent.
- Split or shared visits exist only in facility settings, and the claim needs modifier FS.
- State scope-of-practice law sets the floor. A payer rule cannot authorize care your state prohibits.
- The teaching physician’s presence has to appear in the physician’s own note, not in the resident’s.
Supervision is a condition of payment, and the record is the only proof that the condition was met.42 CFR 410.32(b)(1) treats a service furnished without the required supervision as not reasonable and necessary.
The word supervision appears in a state statute, a Medicare regulation, a payer manual and an employment contract, and it rarely means the same thing in all four. A practice that reads only the payer manual tends to staff to the loosest version of the rule and bill to the tightest, which is the arrangement that produces recoupments two years later. The way out is a written matrix: for each clinician type and each payer, the level of supervision required, who is allowed to provide it, and where the proof lives.
Three levels, three different grants of authority
Medicare uses one word for three standards that permit different things. The definitions sit in 42 CFR 410.32(b)(3), and payers borrow them constantly, including payers that never cite the regulation by number.
| Level | What it requires | Where it shows up |
|---|---|---|
| General | The physician directs and controls the service. Presence is not required while it is performed. | Diagnostic tests with a level 1 supervision indicator, care management services |
| Direct | The physician is in the office suite and immediately available for the entire service. Presence in the room is not required. | Incident to office visits, many diagnostic tests |
| Personal | The physician is in the room while the procedure is performed. | Certain procedures and contrast studies |
Missing the required level is not a coding correction. Section 410.32(b)(1) says a service furnished without the required supervision is not reasonable and necessary, so the claim fails on coverage. An auditor does not have to argue about the code or the documentation guidelines. They only have to establish that nobody qualified was available.
The current text of 42 CFR 410.32(b)(3)(ii) allows direct supervision through real-time audio and video for services without a 010 or 090 global surgery indicator. Audio only never satisfies the standard, and the option does not reach procedures that carry a global surgical period.
For a diagnostic test, the supervision level is published in the Medicare Physician Fee Schedule database as a supervision indicator, and the MAC that processes your claims publishes the table. The indicator for the specific code controls, not the general habit of the practice.
The supervisor has to be the right clinician
A physician who happens to be in the building cannot supervise every service. Eligibility depends on the clinician being supervised, the state, and whether the supervisor is enrolled with that payer.
| Service | Who may supervise | Authority |
|---|---|---|
| Office visit incident to a physician | A physician in the group, present in the suite | 42 CFR 410.26 |
| Anesthesia delivered by a CRNA | The operating practitioner or an anesthesiologist, immediately available | 42 CFR 482.52(a)(4) |
| Radiology assistant at the personal level | A physician at the direct level, where state law permits | 42 CFR 410.32(b)(4) |
| Behavior-analytic services by an RBT | A BCBA or BCaBA with the 8-hour supervisor training | BACB RBT Handbook |
The CRNA rule shows how far the variation runs. Hospitals must place a CRNA under the supervision of the operating practitioner or an anesthesiologist who is immediately available, unless the state has opted out under 42 CFR 482.52(c). The opt-out is a governor’s attestation to CMS after consulting the state boards of medicine and nursing. It is not a decision a practice or a hospital administrator can make on its own.
Enrollment decides the rest. A physician who joined the group last month and has not finished Medicare enrollment cannot stand as the supervising provider on a Medicare claim, even if they were physically present and clinically responsible. Locum tenens arrangements carry their own enrollment and billing conditions, and a supervising role is one of the places where a lapsed enrollment surfaces fastest. The credentialing file and the schedule have to agree before the visit happens, not after the denial.
Office visits and facility visits run on different rules
Incident to billing is an office rule. Split or shared billing is a facility rule. Practices that blur the two end up with claims that cannot be defended in either frame. The mechanics of the office rule are covered in detail in our guide to incident to billing; what matters here is where the boundary sits.
| Element | Incident to | Split or shared |
|---|---|---|
| Setting | Physician office or clinic | Hospital, emergency department, hospital outpatient |
| Patient | Established, with an established problem | New or established |
| Supervision | Direct, at the time of the visit | Both practitioners in the same group on the same day |
| Who bills | The physician who supervised | The practitioner who performed the substantive portion |
| Claim marker | None | Modifier FS |
| Payment | 100 percent | 100 percent for the physician, 85 percent for the NPP |
CMS redefined the substantive portion for 2024 as more than half of the total time or a substantive part of the medical decision making. MM13592 carries that definition into the claims processing manual and repeats the exclusion that office visits and nursing facility visits cannot be billed as split or shared. Critical care, which is billed on time alone, still uses more than half of the total time. Only one of the two practitioners needs to see the patient face to face, but the one who bills must sign and date the record.
An established patient seen for a blood pressure check who also raises a new shoulder complaint has taken the encounter outside the incident to path. The visit no longer qualifies, and the honest repair is to bill it under the NPP’s own NPI at 85 percent rather than to split one note into two payment theories.
The same boundary explains a denial pattern that shows up in behavioral health and therapy claims. A technician delivering a service in a clinic is not automatically incident to anything. The setting, the patient’s history with the billing practitioner and the existence of a physician-authored plan all have to line up before the physician’s rate applies.
Teaching physicians: presence someone else can read
42 CFR 415.172 pays for a resident’s work only when a teaching physician is present during the key portion of the service. For evaluation and management, that means presence in person during the portion that determines the level billed. For surgery, the physician may be absent during opening and closing but must be present for the critical portions and immediately available throughout. For endoscopy, presence during the entire viewing is required.
Documentation carries the payment. The teaching physician must document that they performed the service or were physically present during the key or critical portions, and that they took part in managing the patient. A resident’s note saying the physician was there does not establish it. CMS lists bare countersignatures and phrases like agree with above as unacceptable, because they do not show what the physician actually did.
- The physician’s note states that they performed the service or were present for the key or critical portions.
- The note states their participation in the patient’s management.
- The note references the resident’s note when it relies on it.
- The combined record supports both the level billed and the medical necessity.
- Any student documentation has been verified by the physician before it supports a code.
The teaching setting also has its own billing identity. Services billed by the teaching physician carry the physician’s NPI and the appropriate teaching modifier, and the group has to keep the resident’s contribution and the physician’s attestation in one record that a reviewer can follow without asking questions.
State law sets the floor under every payer rule
Medicare does not license clinicians. It pays them inside the limits their state sets. Section 410.26(a)(1) requires incident to auxiliary personnel to meet the licensure requirements of the state where the service is furnished, and 410.32(b)(1) lets a nurse practitioner, physician assistant, CRNA or nurse-midwife supervise diagnostic tests only to the extent state law authorizes. When a payer rule and a state rule disagree, the practice has to satisfy both.
| Model | What state law requires | What it changes for billing |
|---|---|---|
| Full practice | Board of nursing authority over evaluation, diagnosis, treatment and prescribing | No collaborative agreement to produce, though payer policy still governs payment |
| Reduced practice | A career-long collaborative agreement, or limits on where the NP may practice | The agreement has to exist and be current before the claim |
| Restricted practice | Career-long supervision, delegation or team management by another provider | The supervisory relationship is a licensure condition, not only a payment one |
The American Association of Nurse Practitioners sorts states into those three categories and updates the map as legislatures act, so the current map matters more than any list printed in an article. Physician assistants sit under a separate statute in every state, usually a supervision or collaboration agreement, and several states cap how many PAs one physician may supervise or how far away the physician may be.
Medicaid adds a third layer. Each state sets supervision, enrollment and coverage rules in its own provider manual, and those rules are frequently stricter than Medicare’s. A practice that expands into a new state has to read the state manual for the specific service, then confirm the payer’s credentialing file lists the supervising clinician in the right role. Our credentialing work covers the enrollment side of that sequence.
If the state requires a written collaborative agreement and the payer requires direct supervision, the practice meets both. If a commercial contract bans incident to billing outright, the Medicare permission is irrelevant to that contract. Build the matrix on the stricter of the two, and the claim survives either review.
Behavioral health supervision is a credential condition
An ABA agency runs two supervision systems at the same time, and they answer to different authorities. The clinical system is set by the Behavior Analyst Certification Board. An RBT needs at least 5 percent of the hours spent providing behavior-analytic services supervised each calendar month, delivered through at least two real-time contacts, one of them individual, with at least one including direct observation of the RBT working with a client. Supervisors must be a BCBA or BCaBA who completed the 8-hour supervision training.
The billing system is separate. Supervising an RBT is not a billable service. The billable service is adaptive behavior treatment with protocol modification, 97155, delivered by a qualified professional who is directing the technician’s work. Payers set their own rules for who qualifies and how much technician time may sit under one professional, and those rules do not always match the certification standard.
State licensure of behavior analysts adds the third variable. Some states license BCBAs, others regulate them only through certification, and the payer’s credentialing file has to reflect the state where the patient is located. An agency operating across a state line can find that the same clinician is independent in one office and requires supervision in another. The behavioral health revenue cycle view of this is that authorization, credentialing and supervision all have to be checked per location, not per company.
Build the matrix once, then audit against it
The practices that avoid supervision denials are not the ones with the most conservative policy. They are the ones that wrote the rule down and can show the record matches it. The work takes about a day per payer and then becomes a schedule constraint rather than a billing surprise.
Include locums, contractors and anyone who floats between sites. A matrix built only on employees misses the arrangements that get audited.
Use the payer’s own words and cite the policy number. Where the payer is silent, use the Medicare definition and mark the assumption.
A named list per site, checked against enrollment status. If the physician is not enrolled, the name comes off the list.
A required field in the EHR and in the note template, with the level and whether supervision was in person or by video.
Pull one from each clinician and payer pair. Log the failures, fix the template, and keep the log.
The record should answer the auditor’s question without a conversation: who supervised, at what level, when, and where. When the note cannot answer that, the claim has no supervising physician in any useful sense, no matter whose NPI sits in box 33. The related work on medical billing services treats supervision review as part of the same file as coding and eligibility, because the denial reasons overlap.
Questions about supervising physician rules
No. Medicare allows any physician in the same group who is present in the office suite and immediately available to supervise the visit, and the claim bills under that physician’s NPI. The plan of care itself must still have been established by a physician in the group. Document both names: the physician who supervised and the physician who set the plan.
For services without a 010 or 090 global surgery indicator, the current text of 42 CFR 410.32(b)(3)(ii) permits direct supervision through real-time audio and video. Audio alone does not qualify, and procedures with a global surgical period are excluded. Check the specific payer policy, because not every commercial plan has adopted the same definition.
No. Incident to billing requires an established patient with a problem the physician has already evaluated, following a plan the physician set. A new patient has no such history, so the visit bills under the NPP’s own NPI at 85 percent of the fee schedule. The same applies to an established patient who raises a new problem the physician has not assessed.
The practitioner who performed the substantive portion: more than half of the total time, or a substantive part of the medical decision making. The claim carries modifier FS, and the billing practitioner signs and dates the record. Office visits and nursing facility visits cannot be billed as split or shared, so this route applies in facility settings only.
Often only partly. Many commercial plans require the NPP to bill under their own NPI regardless of supervision, and some prohibit incident to billing in the contract language. Medicaid programs write their own rules in state provider manuals. Read the payer policy and the contract for each plan, and treat the Medicare definitions as a fallback rather than a guarantee.
The claim becomes vulnerable even when the supervision happened. A reviewer cannot verify presence from a note that never mentions it, and 42 CFR 410.32(b)(1) treats a service without the required supervision as not reasonable and necessary. The usual outcomes are a denial on review or a recoupment after payment. A required EHR field is cheaper than the appeal.
The bottom line
Supervision rules reward the practice that writes them down before the schedule is built. The matrix takes a day, and it turns an audit question into a checklist item. When the record names the supervisor, the level and the setting, the claim stops depending on anyone’s memory.
Which supervising physician is on your claims?
We review the supervision matrix behind your NPP, therapy and teaching claims, compare it to each payer’s policy and your state rules, and show you where the record would fail a review.
Request a free supervision reviewThis article summarizes federal regulations and published payer guidance as of October 2026 and is not legal advice; confirm current requirements with your MAC, state board and payer contracts.
