Incident-to billing lets a practice bill Medicare for services furnished by an NP, PA, or other auxiliary personnel under a physician’s name and NPI, at the full physician fee schedule rate. When it works correctly, the practice collects 100 percent of the physician rate instead of the 85 percent rate that applies when the NP or PA bills under their own credentials.
When it does not work correctly, the practice faces claim denials, pre-payment or post-payment review, and potential false claims liability. CMS states that failure to comply with incident-to rules can lead to problems ranging from claim denials to being placed on review or facing liability reaching back up to six years.
This article covers what incident-to billing requires, why it causes denials, and what the billing workflow needs to prevent problems. It is a billing operations guide, not legal advice.
What incident-to billing requires
CMS describes incident-to services as Medicare-covered services and supplies that auxiliary personnel provide as an integral, incidental part of a physician’s or NPP’s professional services.
The requirements are specific:
Direct supervision. The physician must be present in the office suite and immediately available to provide assistance and direction when the service is performed. The physician does not need to be in the room. An office suite generally means offices within one building under a single lease.
CMS has made permanent a provision allowing virtual presence through real-time audio and visual telecommunications for certain services that require direct supervision. For other incident-to services, virtual supervision is permitted through December 31, 2025, after which the rule may change.
Physician’s plan of care. The service must be part of the physician’s ongoing course of treatment. The physician must have performed an initial service and established the plan of care. Incident-to billing is not available for new patients or new problems that the physician has not evaluated.
Integral and incidental. The service must be an integral, though incidental, part of the physician’s professional services. It should be a type of service commonly furnished in a physician’s office.
Auxiliary personnel. The person performing the service must meet the qualifications required by Medicare to furnish the specific service.
Why incident-to billing causes denials
The physician was not physically present
This is the most common denial trigger. If the physician was out of the office, at a different location, or otherwise not in the suite when the service was furnished, the direct supervision requirement is not met. Billing the service under the physician’s NPI when the physician was not present is improper.
The risk is highest in practices where physicians split time between locations, work part-time, or have unpredictable schedules. If the scheduling system does not flag when the supervising physician is absent, claims may be submitted for incident-to services that do not qualify.
The patient is new or the problem is new
Incident-to billing requires that the physician has performed the initial service and established the plan of care. If an NP sees a new patient for a new problem and the claim is billed under the physician’s NPI as incident-to, the claim does not meet the requirements.
This creates a practical challenge: the front desk and scheduling system need to know whether the patient has been seen by the physician for this problem before the NP’s visit is coded as incident-to.
The documentation does not support the billing
Even if the supervision and plan-of-care requirements are met, the documentation must support the incident-to arrangement. If the chart does not show the physician’s initial evaluation, the plan of care, or the ongoing treatment relationship, the claim may not survive review.
The service was furnished outside the office
Incident-to billing generally applies to services furnished in the physician’s office. Services furnished in a patient’s home, a nursing facility, or other non-office settings may not qualify, depending on the specific rules.
The payment difference that drives the behavior
The reason practices use incident-to billing is the payment differential. When an NP or PA bills under their own NPI, Medicare pays 85 percent of the physician fee schedule. When the same service is billed incident-to under the physician’s NPI, Medicare pays 100 percent.
That 15 percent difference adds up across hundreds of claims per year. It creates a financial incentive to bill incident-to wherever possible. The problem is that the incentive can push practices to use incident-to billing in situations where the requirements are not met.
What the billing workflow should handle
Physician presence tracking
The scheduling system should make it visible when the supervising physician is in the office and when they are not. If the physician is absent, services furnished by NPs or PAs that day should not be billed incident-to. They should be billed under the NP’s or PA’s own NPI at the 85 percent rate.
New patient and new problem flags
The billing workflow should distinguish between established patients with existing plans of care (potentially eligible for incident-to) and new patients or new problems (not eligible). If the EHR cannot make this distinction automatically, someone needs to check before the claim is coded.
Documentation requirements
The chart should show: the physician’s initial evaluation for this problem, the plan of care, the NP’s or PA’s service as part of that plan, and the physician’s presence in the suite at the time of service. If any element is missing, the claim should be billed under the NP’s or PA’s credentials.
Audit readiness
If the practice bills a high volume of incident-to claims, it may attract pre-payment or post-payment review. The practice should be able to demonstrate, for any claim selected for review, that the supervision, plan-of-care, and documentation requirements were met.
Common mistakes
- Billing incident-to when the physician is at a different location.
- Billing incident-to for new patients the physician has not evaluated.
- Using incident-to as the default billing method without verifying eligibility per claim.
- Not documenting the physician’s plan of care in the chart.
- Assuming virtual supervision is permanently available for all incident-to services without checking current CMS rules.
- Not updating the billing workflow when physician schedules change.
What to check
- Does the scheduling system track which physicians are in the office on which days?
- Does the billing workflow verify that the patient has an established plan of care before coding incident-to?
- Is documentation consistently showing the physician’s initial evaluation and plan?
- What percentage of NP/PA claims are billed incident-to versus under their own NPI?
- Has the practice reviewed its incident-to claims for compliance in the past 12 months?
- Are virtual supervision rules current, or is the practice relying on expired temporary provisions?
If those answers are unclear, the practice may be billing incident-to claims that do not meet the requirements.
How Neobill can help
Neobill works with practices that use NPs, PAs, and other non-physician practitioners alongside physicians. The free audit reviews claim patterns, incident-to billing rates, documentation practices, and the operational controls that prevent incident-to denials from becoming a systemic problem.