Nurse practitioner and physician assistant billing, done by the clinician's own rules
Our nurse practitioner billing services and physician assistant billing services cover the full revenue cycle for practices that employ advanced practice providers — enrollment, coding, claims, denials and payer follow-up. A nurse practitioner and a physician assistant are both advanced practice providers, but payers treat them differently: different enrollment paths, different payment percentages, different supervision rules, and different documentation expectations. Billing them correctly means knowing which rules apply to which clinician, on every claim.
We bill for practices where APPs carry their own patient panels, for groups where APPs support physicians, and for facilities where APPs cover hospital services. Our medical coding team reviews APP claims against the documentation before submission, and our credentialing and enrollment service keeps each clinician's payer files current.
How nurse practitioner billing services differ from physician assistant billing
Medicare pays both nurse practitioners and physician assistants at 85 percent of the physician fee schedule for covered services. Since January 1, 2022, physician assistants have also been able to enroll in Medicare and receive direct payment for their services, rather than having payment made only to an employer. Each clinician still needs an individual NPI, and Medicare enrollment runs through PECOS.
Commercial payers are less uniform. Many credential nurse practitioners and physician assistants individually and pay them at their own fee schedules; some pay a percentage of the physician rate; a few still do not credential APPs at all, which means those claims have to be handled under the payer's own rules. We confirm the enrollment path and the payment rate with each payer before billing starts, so a credentialing gap never becomes a denial pattern.
State law adds another layer. Scope-of-practice rules differ by state for both NPs and PAs, and what a clinician may do clinically affects what can be billed. Practices that hire across state lines need the supervision and collaboration paperwork right in each state before claims go out.
Incident-to billing and split/shared visits
When a physician assistant or nurse practitioner provides services under a physician's supervision, Medicare's incident-to rules allow the visit to be billed under the supervising physician's NPI at the full physician rate — but the conditions are strict. The patient must be an established patient with an established plan of care, the supervising physician must provide direct supervision in the office where the service is furnished, and auxiliary personnel rules apply. New problems and new patients are billed under the APP's own NPI at the 85 percent rate.
In hospital settings, split or shared visits add another billing decision. When a physician and an APP both see the same patient on the same date, the visit is billed by the clinician who performs the substantive portion, reported with the appropriate modifier. The documentation has to show who did what, because the billing clinician is determined from the note, not from the schedule.
We check supervision documentation, established-patient status and the substantive-portion evidence during our Advanced Pre-Submission Claim Review, before the claim is submitted — the most common incident-to failures are a note that doesn't name the supervising physician, a new problem billed incident-to, or supervision that doesn't meet the direct-supervision standard.
Coding patterns that cause APP denials
APP coding follows the same E/M rules as physician coding: visits are coded by medical decision making or by total time, and the documentation has to support the level billed. A few patterns cause repeat trouble for nurse practitioner billing and physician assistant billing:
- Copying the physician's level: APP visits are often shorter or focused on follow-up; the E/M level has to come from the APP's own documentation, not from the physician's usual level for the diagnosis.
- Time-based coding without time: when a visit is coded by time, the note must show the total time and what it was spent on — date, minutes and activity.
- Therapy and incident-to confusion: incident-to billing does not apply the way many practices expect in every setting, and physical or occupational therapy services have their own supervision rules.
- Missing modifiers: split/shared visits and assistant-at-surgery services need their modifiers on the claim, or payment goes to the wrong clinician or denies.
- Telehealth clinician identity: the rendering clinician's NPI on the claim must match the clinician who actually provided the telehealth visit.
Common APP billing denials and how we prevent them
| Denial | Typical cause | Prevention step |
|---|---|---|
| Clinician not enrolled | APP not credentialed with the payer on the date of service | Enrollment status confirmed per payer before scheduling |
| Incident-to rejected | New patient or new problem billed under the physician NPI, or supervision not documented | Established-patient and supervision checks before submission |
| Wrong payment rate | Claim billed under the wrong NPI for the clinician who did the work | Rendering NPI reconciled to the note at charge entry |
| Scope-of-practice denial | Service outside the clinician's authorized scope in that state | State scope rules checked for new services |
| Split/shared visit paid wrong | No evidence of which clinician did the substantive portion | Note shows each clinician's contribution |
Denials that do occur are worked by our denial management team, which corrects and resubmits or appeals with the record, and open balances are followed up by payer and age.
Credentialing nurse practitioners and physician assistants
Practices add APPs fast — a new nurse practitioner or physician assistant can start seeing patients while payer files are still in progress. That gap is where revenue leaks: claims held, claims billed under the wrong NPI, or claims that pay at the wrong rate for months. Our credentialing service tracks each clinician through a nine-stage process — consultation, document collection, NPI and CAQH setup, payer applications, follow-ups and final approval — and confirms effective dates before billing starts.
CAQH profiles need to stay attested and current for both NPs and PAs, and re-credentialing cycles run on the payers' schedules, not yours. We keep one calendar of due dates per clinician so enrollment never lapses quietly.
How Fastora supports advanced practice provider billing
Fastora works inside your existing EHR/PM system under the user access you grant, with no software to install and no hidden setup fees. You get a dedicated account contact, transparent dashboards, monthly performance reporting and a monthly review call.
Fees are quoted after a free assessment, and you can read how our pricing models work beforehand. To see how your current APP claims hold up, start with a free billing assessment.