If a nurse practitioner or physician assistant sees your patients, you’ve probably run into the term incident-to billing. It’s a specific Medicare billing arrangement, and it comes with its own set of requirements around supervision, documentation, and patient status.
This guide walks through what the term means, how it works in practice, when it applies, and how it fits into the broader revenue cycle of a medical practice.
What Is Incident To-Billing?
Incident-to billing is a Medicare Part B billing method that allows services performed by qualified auxiliary personnel to be billed under the supervising physician’s or other eligible practitioner’s National Provider Identifier rather than the person who performed the service.
When a service meets Medicare’s conditions, it can be reimbursed at 100% of the Medicare Physician Fee Schedule when billed by the supervising physician or other eligible practitioner. By comparison, when certain nonphysician practitioners, such as nurse practitioners or physician assistants, bill their own eligible services directly, Medicare generally pays 85% of the physician fee schedule amount.
A few conditions need to line up before this applies. The physician or other eligible practitioner must have already performed an initial service and remain actively involved in the patient’s course of treatment, the person performing the follow-up service must be qualified, and the applicable supervision requirement must be met at the time of service. This is different from ordinary or direct billing, where an eligible practitioner bills Medicare for services they personally perform under their own NPI.
How Does Incident-To Billing Work?
Incident-to billing follows a fairly predictable sequence from the first visit through payment:
- Initial visit: The supervising physician or other eligible practitioner sees the patient, provides the initial service, and establishes a treatment plan.
- Established treatment plan: A documented plan of care exists that the follow-up service is built around.
- Qualified personnel provide the follow-up service: Auxiliary personnel who meet the applicable qualifications carry out the subsequent service in line with that plan.
- Supervision requirement: The supervising practitioner meets the required level of supervision during the encounter. For applicable services in 2026, direct supervision can also be provided virtually through real-time, two-way audio and video.
- Documentation: The chart reflects the physician’s or other eligible practitioner’s initial involvement, the plan of care, who performed the service, and the required supervision.
- Coding and claim submission: The claim is submitted under the supervising physician’s or other eligible practitioner’s NPI.
- Payment: Medicare pays at the rate that applies to the qualifying incident-to service.
What Are the Incident-To Billing Requirements?
Medicare’s incident-to-billing requirements exist to confirm that a service billed under a physician’s NPI genuinely fits within that physician’s ongoing care of the patient. According to Medicare Benefit Policy Manual, the core incident to billing requirements include:
- Initial service and active involvement: The billing physician must have personally performed the initial service and remain actively involved in the patient’s care.
- Established treatment plan: The follow-up service has to fit within an established plan of care that the physician is actively managing.
- Qualified personnel: The person performing the service must meet the applicable qualification, licensure, and scope-of-practice requirements.
- Direct supervision: The supervising practitioner must provide the required direct supervision during the service. For applicable services in 2026, direct supervision can also be provided through real-time, two-way audio and video.
- Appropriate setting: The service generally needs to take place in an eligible setting, such as a physician office or clinic, depending on the applicable incident-to rules.
- Practitioner expense: The supervising physician typically bears the expense of the auxiliary personnel providing the service.
- Documentation: The medical record must support the requirements for the incident-to service.
- State law and scope of practice: The arrangement must also be consistent with the applicable state’s licensing and scope-of-practice rules, which can be more restrictive than Medicare’s federal requirements.
These are the conditions that must be true before a claim can be billed as incident-to. How those conditions translate into day-to-day billing decisions is covered in the rules section further down this guide.
What Are the Incident-To Billing Rules?
Once a service meets the incident-to requirements, the billing side still needs to follow Medicare’s rules. The main billing points involve the NPI used on the claim, Medicare enrollment, and the payment rules that apply to the billing practitioner.
- Correct NPI: The supervising physician or other eligible practitioner who qualifies to bill the incident-to service must use their NPI when submitting the claim.
- Medicare enrollment: The practitioner billing incident-to services must meet Medicare’s applicable enrollment and NPI requirements.
- Billing responsibility: Only the physician or other eligible practitioner who supervises the applicable incident-to service may bill it under the incident-to provision.
- Payment rate: The applicable payment rate depends on who bills the incident-to service. For example, CMS states that incident-to services billed by a physician can be paid at 100% of the physician fee schedule amount, while certain services billed by an NPP are paid at 85%.
- Payer rules: Incident-to is a Medicare provision. Other payers may have different billing or credentialing requirements.
- MAC guidance: For a Medicare billing situation that is not clearly addressed by the general rules, check the guidance from the applicable Medicare Administrative Contractor (MAC).
What Is the Supervision Requirement for Incident-To Billing?
Supervision is a key part of incident-to billing. The required level of supervision can vary by the type of service, so understanding the applicable supervision rule is important.
Direct Supervision
For standard incident-to services, direct supervision means the supervising physician or other eligible practitioner must be immediately available to provide assistance and direction during the service. The practitioner does not necessarily have to be in the same room as the patient.
General Supervision
General supervision means the supervising practitioner does not have to be immediately available during the service. Medicare allows general supervision for certain incident-to services, including behavioral health services and certain transitional care management and chronic care management services.
Virtual Direct Supervision
Beginning January 1, 2026, Medicare allows virtual direct supervision for applicable services through real-time, interactive audio and visual telecommunications. Audio-only communication does not meet this direct supervision standard.
The 2026 Supervision Update
CMS made virtual direct supervision a permanent option for applicable incident-to services beginning January 1, 2026. For these services, the supervising physician or other practitioner may provide direct supervision through real-time audio and visual interactive telecommunications, excluding audio-only communication. Services with global surgery indicators 010 or 090 are excluded from this virtual supervision policy.
Which Settings Allow Incident-To Billing?
Incident-to billing can work differently depending on where the service is provided. The care setting can affect which Medicare billing rules apply.
Physician Offices and Clinics
Physician offices and eligible noninstitutional settings are the main settings for standard incident-to billing. The usual requirements for supervision, treatment plans, qualified personnel, and documentation apply here.
Hospital Inpatient Services
Hospital inpatient care generally follows different Medicare billing rules. Standard physician-office incident-to rules do not apply in the same way to inpatient services.
Hospital Outpatient Services
Hospital outpatient departments have their own Medicare payment rules. Incident-to services may apply in some cases, but practices should follow the requirements for the specific outpatient setting.
Skilled Nursing Facilities
SNF services can involve different Medicare billing rules, especially during a Part A-covered stay. Some services may fall under the SNF’s consolidated billing requirements.
Home-Based Services
Services provided in a patient’s home may have additional requirements. Practices should confirm that the service meets the applicable incident-to and supervision rules before billing it this way.
RHCs and FQHCs
Rural Health Clinics and Federally Qualified Health Centers follow specific Medicare payment and incident-to rules. Their billing teams should use the guidance that applies specifically to RHCs and FQHCs rather than assuming standard office rules apply.
What Services Can Be Billed Incident-To?
Incident-to billing can apply to certain Medicare-covered services and supplies provided by qualified auxiliary personnel as part of a physician’s or other eligible practitioner’s ongoing care. The service must meet Medicare’s requirements for the treatment plan, supervision, personnel, setting, and documentation.
Common examples include:
| Scenario | Does It Qualify? | Why? |
| Established patient follow-up | May qualify | The service continues an existing treatment plan and meets the other incident-to requirements. |
| Service by auxiliary personnel | May qualify | The personnel are qualified, and the required supervision and other conditions are met. |
| New patient visit | Generally does not qualify | Standard incident-to billing requires an initial service and an established course of treatment. |
| New problem or treatment change | Generally does not qualify | A new problem may require the physician or other eligible practitioner to personally evaluate the patient and establish or change the treatment plan. |
| Required supervision is not available | Does not qualify | The applicable supervision requirement must be met when the service is provided. |
How Do You Know If a Service Qualifies for Incident-To Billing?
Before submitting a claim as incident-to, check that the service meets the key Medicare conditions. A service may qualify when all of the following apply:
- Established patient and treatment plan
- Initial service by eligible practitioner
- Qualified personnel provided the service
- Required supervision was available
- Eligible service and setting
- Documentation supports the claim
If one of these conditions is missing, the service may need to be billed under the practitioner who actually performed it instead of under the supervising practitioner’s NPI.
How Is Incident-To Billing Different From Direct Billing?
Incident-to billing and direct billing differ mainly in who performs the service, who bills Medicare, and which billing requirements apply.
| Factor | Incident-To Billing | Direct Billing |
| Service provider | Qualified auxiliary personnel | Enrolled practitioner |
| Practitioner role | Initial service and ongoing involvement required | Depends on the service |
| Supervision | Required level depends on the service | Varies by service |
| Who bills | Supervising eligible practitioner | Practitioner billing the service |
| Requirements | Specific incident-to requirements | Service and enrollment requirements |
What Documentation Is Required for Incident-To Billing?
Your medical record should clearly show what happened during the visit. It should give Medicare enough information to understand the service and support the claim.
- Patient visit: Note what happened during the patient’s visit.
- Service provided: Clearly record the service that was performed.
- Who provided it: Include the name of the person who provided the service.
- Reason for the service: Record why the patient needed the service.
- Claim details: Make sure the information in the medical record matches the claim you submit.
What Else Should You Check Before Billing Incident-To?
Medicare’s incident-to rules are only one part of the billing process. Before submitting a claim, make sure the service also follows your state’s requirements and the payer’s rules.
Check the Correct NPI and Claim Details
Use the NPI of the practitioner who is billing the incident-to service. The claim should also match the medical record and other billing details.
- Use the correct NPI
- Match claim information
- Keep records consistent
Follow Your State’s Requirements
Medicare may allow an incident-to arrangement, but your state may have additional rules about who can provide or supervise a service. Always follow the requirements that apply where the service is provided.
- Check state licensing rules
- Confirm provider scope
- Follow supervision requirements
Check Commercial Payer Rules
Incident-to billing is a Medicare concept. Commercial insurance companies may have their own rules for provider credentialing, billing, and reimbursement. Do not assume their requirements are the same as Medicare’s.
- Check each payer’s rules
- Confirm billing requirements
- Verify provider credentialing
Let our billing team handle the details and keep your incident-to claims on track.
Let our billing team handle the details and keep your incident-to claims on track.
Conclusion
Incident-to billing allows eligible services provided by qualified auxiliary personnel to be billed under a supervising physician’s or other eligible practitioner’s NPI when Medicare requirements are met. These requirements include an established treatment plan, qualified personnel, appropriate supervision, an eligible setting, and supporting documentation.
Before submitting an incident-to claim, verify that every applicable Medicare requirement is satisfied and that the medical record supports the service. State laws and commercial payer rules may also apply, so billing teams should confirm requirements for each service and payer.
Frequently Asked Questions
