Under Medicare’s “incident to” billing rules, a practice can submit a claim for a service performed by auxiliary staff as though the supervising physician or qualifying practitioner did it themselves, which pays 100% of the Physician Fee Schedule rate instead of the 85% that nurse practitioners and physician assistants receive when they bill independently.1eCFR. 42 CFR Part 414 Subpart B – Physicians and Other Practitioners The 15% is the incentive; the compliance risk is the reason careful practices treat incident to billing under Medicare as a set of rules to meet on every claim, not a default setting. Federal auditors have kept these claims on their radar for years, and 2026 brings a permanent rule change on supervision that reshapes how the requirement can be met.
The Four Conditions Every Incident to Claim Must Meet
All four apply. Miss one, and the service either bills under the auxiliary provider’s own NPI at the reduced rate or should not be submitted at all.
The physician or other qualifying practitioner must have personally seen the patient first and established the diagnosis and plan of care. A patient’s very first visit can never be billed incident to.2CGS Medicare. The Incident to Provision of Medicare Fact Sheet
That same practitioner must stay actively involved in the patient’s care. One initial visit followed by months of staff-only follow-ups will not survive review; the record needs to show the physician continuing to manage the treatment.3Centers for Medicare & Medicaid Services. Medicare Benefit Policy Manual Chapter 15
The service itself has to be integral to the practitioner’s professional service and the kind of task routinely performed in that office setting.4Centers for Medicare & Medicaid Services. Incident To Services and Supplies The service must also be an expense to the practice and must comply with state scope-of-practice laws for whoever performs it.
And the supervising practitioner must directly supervise. That means immediately available while the service is being provided, not in another building, not at another office, not reachable only by phone.2CGS Medicare. The Incident to Provision of Medicare Fact Sheet Physical presence in the treatment room is not required. Being reachable across town is not enough.
Where Incident to Billing Works and Where It Does Not
Location is a hard line. Incident to billing works in physician offices, clinics, and, in narrow circumstances, patient homes. It does not work in hospitals, hospital outpatient departments, or skilled nursing facilities.2CGS Medicare. The Incident to Provision of Medicare Fact Sheet Those institutional settings receive their own facility payment, so there is no room for a separate incident to claim under the physician fee schedule.
Off-campus provider-based departments count as institutional here too. A location can feel like an ordinary office and still be barred from incident to billing if it is enrolled as a provider-based department of a hospital.
Home visits can technically qualify, but the supervising practitioner has to be physically present in the home during the encounter.4Centers for Medicare & Medicaid Services. Incident To Services and Supplies Virtual supervision does not satisfy the requirement in the home, which makes incident to billing there uncommon.
Virtual Direct Supervision in 2026
Effective January 1, 2026, CMS permanently allows the supervising practitioner to meet the “immediately available” requirement through real-time audio and video technology rather than by being physically in the office suite.5eCFR. 42 CFR 410.26 – Services Incident to a Physicians Professional Services Audio-only does not count. The connection has to be two-way live video, and a supervisor who steps away from the screen or drops to phone during the encounter has broken supervision.
The virtual option covers most incident to services along with many diagnostic tests, pulmonary rehabilitation, and cardiac rehabilitation services.6Centers for Medicare & Medicaid Services. Telehealth FAQ It does not cover services with a 010 or 090 global surgery indicator, where physical presence is still required.7Centers for Medicare & Medicaid Services. Medicare Physician Fee Schedule Final Rule Summary CY 2026
For practices with satellite offices or rural coverage, this changes real workflows. A physician can supervise a second location by live video from the main clinic. Practices that intend to rely on this should be prepared to show, from the record, that a compliant video connection was in place during the service.
Who Can Supervise and Who Can Provide the Service
Two roles run in parallel. The person doing the work is auxiliary personnel: nurses, medical assistants, technicians, therapists, and other clinical employees.4Centers for Medicare & Medicaid Services. Incident To Services and Supplies They must be an employee, leased employee, or independent contractor of the supervising practitioner or of the entity that employs the practitioner.5eCFR. 42 CFR 410.26 – Services Incident to a Physicians Professional Services They cannot be excluded from federal healthcare programs, and they must meet state licensing requirements for whatever they perform.
The supervising practitioner does not have to be a physician. Nurse practitioners, physician assistants, clinical nurse specialists, and certified nurse-midwives can each supervise auxiliary personnel and bill incident to services under their own NPI.4Centers for Medicare & Medicaid Services. Incident To Services and Supplies The same rules follow them: they must have initiated the treatment plan, stay involved, and provide the required supervision. An NP or PA can supervise incident to services in one scenario and, in another, be the practitioner who provided services incident to a physician. Which role applies depends on who initiated the plan and who is supervising the specific encounter being billed.
New Problems and Changes to the Plan of Care
This is where most incident to claims fall apart on audit. The framework assumes staff are carrying out an existing plan for a previously diagnosed condition. A patient who arrives with a new complaint, or a new symptom unrelated to the established diagnosis, has stepped outside that assumption.
If the patient presents a new medical problem, the visit can only be billed incident to when the physician personally sees the patient, initiates the treatment plan for the new condition, and signs the documentation.8Noridian Medicare. Incident To – JE Part B Without those steps, the NPP has to bill under their own NPI at their own rate.
Plan changes work the same way. An incident to service must rest on a previously identified problem with a plan the treating provider has already established.2CGS Medicare. The Incident to Provision of Medicare Fact Sheet If the NPP decides the plan is not working and makes significant modifications, that visit reflects independent clinical judgment and should be billed under the NPP’s credentials. Practices that treat every follow-up as incident to by default end up on audit lists.
Documentation That Holds Up
Auditors do not assume the rules were followed. They look for proof. A defensible chart shows the initial encounter where the physician established the diagnosis and plan, and every incident to visit that references that plan. It shows the auxiliary staff member’s notes describing what they actually did and how it ties to the established plan; entries like “follow-up per plan” are not enough. It shows the supervising practitioner was present and immediately available on the day of service, whether through schedule records, electronic health record login data, or an attestation. And it carries proper signatures: either the supervising provider signs with a note identifying who performed the service, co-signs the auxiliary staff member’s note, or the NPP who performed the service signs it themselves.2CGS Medicare. The Incident to Provision of Medicare Fact Sheet
The chart and the claim need to match. If the record shows the physician was out of the office on a day their NPI was used for incident to services, that discrepancy tends to widen into a bigger review.
CMS-1500 Fields That Trip Up Practices
Incident to claims go on the CMS-1500 form. Two fields matter most. Box 24J takes the NPI of the supervising practitioner; when the ordering provider is not the same person supervising the encounter, the supervisor’s NPI belongs there.9Centers for Medicare & Medicaid Services. Medicare Claims Processing Manual Chapter 26 – Completing and Processing Form CMS-1500 Data Set Box 33 takes the billing provider’s name, address, and NPI, typically the physician or the group. Putting the auxiliary staff member’s NPI in Box 24J converts the claim in effect to an NPP-billed service at 85%, if it does not get denied outright.
What Incident to Billing Is Not
Two categories look similar and are not.
Split or shared visits are evaluation and management services performed by both a physician and an NPP in the same group during a single encounter in a facility setting, such as a hospital, skilled nursing facility, or emergency department, where incident to billing is not available. Whoever performed the substantive portion bills the service. CMS defines that as more than half the total time the two practitioners spent, or a substantive part of the medical decision-making; for critical care and prolonged services, only time counts.10Centers for Medicare & Medicaid Services. Updates to Split or Shared Evaluation and Management Visits Use incident to in the office; use split or shared in the facility. Crossing them produces denials.
Diagnostic tests are their own Medicare benefit category with their own supervision rules and cannot be billed as incident to services.11Centers for Medicare & Medicaid Services. Supervision Requirements for Diagnostic Tests – Manual Update The list of who may supervise a diagnostic test overlaps with the incident to list, which is what makes the distinction easy to miss. Billing a diagnostic test as incident to instead of under its proper category is a compliance problem even when the clinical workflow looks identical.
Audit Exposure and Penalties
The Office of Inspector General has kept incident to billing under active review for years. One detection method is data mining for impossible days, where a physician’s claim volume implies more services than one person could plausibly perform. Practices that stack incident to claims on top of a physician’s own patient encounters produce the volume spikes that draw attention. Common audit findings include billing new patient visits as incident to, billing new problems as incident to without the required physician encounter, and performing procedures without direct supervision when the rendering provider could have billed independently.
When Medicare determines it overpaid, the MAC sends a demand letter. Interest starts accruing 31 days after the letter if the balance is not paid, and standard recoupment against future payments begins at day 41. A provider has 15 days to submit a rebuttal and 120 days to file a formal redetermination appeal.12Centers for Medicare & Medicaid Services. Medicare Overpayments Fact Sheet Debts unpaid past 120 days can be referred to the U.S. Treasury for collection.
Claims that are known or should have been known to be false can trigger civil False Claims Act liability, with penalties of up to three times the government’s loss plus a per-claim penalty adjusted annually for inflation. Intent to defraud is not required; deliberate ignorance or reckless disregard of accuracy is enough. At the far end are criminal prosecution, civil fines, and exclusion from federal healthcare programs. An excluded provider cannot bill Medicare directly and cannot have their services billed indirectly through an employer or group.13Office of Inspector General. Fraud and Abuse Laws For a Medicare-heavy practice, that is the end of the practice.