Incident to billing lets a physician collect 100 percent of the Medicare fee schedule for a visit that a nurse practitioner, physician assistant, or other qualified staff member actually performed. Medicare treats the encounter as though the physician did it personally, but only when five specific conditions line up at once. Miss one, and that claim belongs under the treating clinician’s own NPI at 85 percent instead. Learn more about medical billing and coding services and how proper coding can help keep incident to claims compliant.
If your practice runs NPs or PAs on follow up visits, this one provision decides whether you collect the full rate or leave 15 percent on the table every single time. Get it wrong, and the exposure runs past a single denied claim. It can mean a recoupment demand covering every visit billed the same way going back months.
What Is Incident to Billing Under Medicare?
Incident to is a Medicare Part B provision, not a general billing concept you can apply to every payer. It only works in an office or clinic setting, what CMS calls a noninstitutional setting, meaning any location other than a hospital or skilled nursing facility. A physician sees a Medicare patient, works up the diagnosis, and sets a treatment plan. On a later visit for that same problem, a nurse practitioner or physician assistant on staff carries the plan forward while the physician stays reachable in the office suite. Bill it correctly, and Medicare pays as if the physician saw the patient both times.
Direct NPP billing is the alternative. An NP or PA can always bill Medicare under their own NPI for a visit they perform, and Medicare pays that claim at 85 percent of the physician fee schedule. Incident to closes that 15 percent gap, but it comes with strings attached.
What Are the CMS Requirements for Incident to Billing?
The Medicare Benefit Policy Manual, Chapter 15, Section 60 lays out the conditions a service must meet before it qualifies as incident to a physician’s professional service. A claim needs all of the following, not most of them.
- An established patient with an existing problem and a plan of care the physician already set in motion
- A physician who personally performed the initial visit, reached the diagnosis, and documented the treatment plan
- A follow up service that stays inside that same plan of care, not a new complaint or a new diagnosis
- Auxiliary personnel who are employees, leased employees, or contracted staff under the billing practice’s direction, not a moonlighting clinician with no formal relationship to the practice
- Direct supervision from a physician or qualified practitioner during the visit
- A noninstitutional setting: an office or clinic, never a hospital or skilled nursing facility
Diagnostic tests never ride on this provision, no matter how routine. Under 42 CFR 410.26, any service with its own Medicare benefit category, including diagnostic testing, gets covered under its own rules instead. Pneumococcal, influenza, and hepatitis B vaccines carry a similar carve out.
Most practices treat these six points as a checklist they run once, during onboarding, and never revisit. That’s a mistake worth fixing. The plan of care requirement and the supervision requirement drift out of compliance quietly, one schedule change or one same day access visit at a time, long after the training session that first covered them.
For practices managing multiple providers, keeping enrollment and provider records current is also important. Our provider credentialing services can help maintain the documentation needed across your provider network.
How Did the 2026 Direct Supervision Rule Change Incident to Billing?
Direct supervision no longer means a physician has to stand in the same office suite. Under the CY 2026 Medicare Physician Fee Schedule final rule, issued October 31, 2025 and effective January 1, 2026, CMS made a pandemic era flexibility permanent: the immediate availability piece of direct supervision can now be met through real time, two way audio and video technology. Audio only calls do not count.
This applies to the majority of Part B services described at 42 CFR 410.26. The exception sits with procedures carrying a global surgery indicator of 010 or 090, where CMS still requires the supervising practitioner to be physically present. For everyday office visits handled incident to, though, a physician working from a different room, a different suite, or even a different building can now supervise by video and stay compliant, as long as the connection is live and immediate. Practices should also understand how Medicare billing requirements
The same final rule set the CY 2026 conversion factors: $33.57 for clinicians in a qualifying alternative payment model and $33.40 for everyone else, both up from $32.35 the year before. Small movements at the fee schedule level, but they compound across every incident to visit you bill correctly.
Does Medicare Allow Incident to Billing for New Patients or New Problems?
No. A new patient always needs a physician encounter first. So does an existing patient who shows up with a problem outside the plan of care the physician already documented. Incident to only covers the follow up work that stays inside a plan the physician personally established. The moment a nurse practitioner evaluates something new on their own, that visit has to go out under the NP’s own NPI at 85 percent, or the physician needs to see the patient and document a new plan before incident to applies again.
Recoupment demands after an incident-to audit can wipe out months of NPP visits.
The OIG’s current national review of Part B incident-to claims makes that risk real right now. Our revenue cycle management team checks supervision documentation and plan of care notes against CMS Chapter 15 requirements before a claim ever goes out. See how revenue cycle management support keeps your incident-to claims defensible.
How Do You Bill Incident to Services on a Claim?
On the CMS-1500 claim form, Item 17 carries the name and qualifier of the practitioner who performed the initial service and set the plan of care. Item 24J carries the NPI of the physician who is billing, the one who supervised the visit. No modifier is required for a compliant incident to claim, which is one thing that separates it from split shared billing in a facility setting. Get the documentation right, and Medicare pays the claim at 100 percent of the physician fee schedule under the supervising physician’s NPI, exactly as though that physician saw the patient.
Our medical billing services team builds this documentation trail into intake so nothing gets billed on a guess.
Incident to vs Split Shared Billing: What’s the Difference?
Practices confuse these two provisions constantly, and mixing them up is one of the fastest ways to draw a payer review. They apply to different settings and follow different rules.
What Common Mistakes Trigger Incident to Billing Audits?
The HHS Office of Inspector General has an active, nationwide review of Medicare Part B incident to payments underway, with results expected during fiscal year 2026. That makes this a live compliance question, not a theoretical one. Auditors pull charts and check every one of the five core requirements against the documentation on file. A handful of patterns show up again and again in the practices that get flagged.
- Billing incident to for a new patient or a new problem that never got a physician encounter
- No supervising physician actually reachable, in person or by real time video, when the NPP saw the patient
- Auxiliary staff with no documented employment or contract relationship to the billing practice
- Chart notes that never tie the day’s visit back to a physician authored plan of care
- Diagnostic tests billed incident to instead of under their own coverage rules
Picture a family medicine practice running four nurse practitioners on incident to for two years without ever pulling an internal chart sample. A Medicare Administrative Contractor review letter finally lands, and half the sampled charts have no note connecting that day’s visit to a physician documented plan. Every one of those claims gets recouped at once, reaching back as far as the audit window allows. That’s not a rare story. It’s the direct result of treating incident to as a one time training topic instead of an ongoing documentation habit.
Practices that catch this early usually run a standing medical billing against their own incident to charts, not just their denial reports, and pair it with denial management services for the claims that already slipped through.
Do Commercial Payers and Medicaid Follow Incident to Billing Rules?
Not consistently, no. Incident to is a Medicare Part B provision first, and Medicare Advantage plans, state Medicaid programs, and commercial payers each set their own policy. Some mirror Medicare’s logic closely. Others require every nurse practitioner and physician assistant to bill under their own number regardless of supervision. Don’t assume your top three commercial payers follow Medicare’s incident to rules just because your billing team has always coded claims that way. Pull each payer’s provider manual and confirm before you apply Medicare logic anywhere else.
For additional guidance on the requirements, see the AAPC Knowledge Center — Seven Incident-to Billing Requirements.
A Compliant Incident to Visit, Start to Finish
Here’s what it looks like end to end, as an illustrative example rather than a specific patient record. A family physician sees a Medicare patient managing type 2 diabetes and documents a treatment plan targeting an A1C under 7. Two weeks later, the same patient returns for a follow up handled by the practice’s nurse practitioner, still working from that plan. The physician is in the office suite that day, reachable within a minute if the NP needs a second opinion. That visit qualifies incident to, billed under the physician’s NPI at 100 percent.
Three months later, the same patient shows up with chest pain, a new problem sitting outside the diabetes plan entirely. That visit needs its own physician encounter, or it goes out under the NP’s NPI at 85 percent. Same patient, same practice, two different billing outcomes, because the second visit never fit inside an existing plan of care.
Want the fuller picture, including credentialing and supervision logs? See our complete incident to billing guide for the documentation workflow we build for clients.
Capture 100% NPP reimbursement without the audit risk.
Incident-to billing done right pays your practice 15% more per NPP visit than direct NPP billing, but one missed supervision note turns that gain into a refund demand. Medicotech’s billers build compliant incident-to workflows into your claims process from day one, matched to your specialty and your EHR. Get medical billing support built around CMS Chapter 15 requirements, not guesswork.
Frequently Asked Questions
Does Medicare allow incident to billing?
Yes, for Part B services in an office or clinic setting, when a physician establishes the diagnosis and treatment plan, then supervises a nurse practitioner or physician assistant on follow up visits for that same problem. The claim goes out under the physician’s NPI at 100 percent of the fee schedule instead of the NPP’s 85 percent rate.
What is the CMS incident to billing guideline for 2026?
The core requirements haven’t changed: an established patient, a physician set plan of care, direct supervision, and a noninstitutional setting. What did change is supervision itself. Since January 1, 2026, CMS permanently allows real time audio and video technology to satisfy direct supervision for most services, audio only calls excluded.
Can incident to billing be used for a new patient?
No. A new patient needs a physician encounter first. Incident to only covers follow up visits inside a plan of care the physician already documented for an existing problem. A new complaint from an established patient resets that requirement too.
Who can supervise incident to services under Medicare?
The physician or other listed practitioner who will bill the service must provide direct supervision, meaning immediate availability to assist if needed. Since 2026, that availability can be satisfied through real time video for most services, though procedures with a 010 or 090 global surgery indicator still require in person supervision.
What is the reimbursement difference between incident to billing and NPP direct billing?
Incident to pays 100 percent of the Medicare physician fee schedule. Billed under the NP or PA’s own NPI instead, the same visit pays 85 percent. On a practice running 30 NPP follow ups a week, that 15 percent gap adds up to real money over a year.
Do you need a modifier for incident to billing?
No modifier is required for a compliant incident to claim. That’s different from split shared billing in a facility setting, which requires the FS modifier to show which clinician performed the substantive portion of the visit.
Can incident to billing apply to diagnostic tests?
No. Diagnostic tests carry their own Medicare benefit category and their own supervision rules under 42 CFR 410.26, so they never qualify as incident to a physician’s service. Vaccines like pneumococcal, influenza, and hepatitis B follow a similar exception.
What triggers a Medicare incident to billing audit?
Auditors look for new patients or new problems billed incident to, supervising physicians who weren’t actually reachable during the visit, auxiliary staff with no documented relationship to the practice, and chart notes that don’t tie back to a physician authored plan of care. The OIG’s current national review of Part B incident to claims makes this an active risk in 2026, not a hypothetical one.
Does Medicaid or commercial insurance follow incident to billing rules?
Not consistently. Incident to is a Medicare Part B provision, and Medicare Advantage plans, state Medicaid programs, and commercial payers each set their own policy. Some mirror Medicare closely, others require every NPP to bill under their own number regardless of supervision. Check each payer’s provider manual before assuming.
What documentation proves compliance with incident to billing?
Chart notes need to show the physician’s original diagnosis and treatment plan, confirm the follow up visit falls inside that same plan, and note that a supervising physician was immediately available during the visit, whether in the office suite or connected by real time video.
