When Billing Under a Collaborator's NPI Becomes a False Claim

Can you bill under your collaborator's NPI while credentialing is pending?

No, and the reason sits in one sentence of the Medicare regulations. A nurse practitioner is paid for professional services only when the nurse practitioner personally performed them, and the same paragraph says no facility or other provider may be paid for furnishing those services 1Ref 1Office of the Federal Register / Centers for Medicare & Medicaid Services (2026).§ 410.75 Nurse practitioners' services..42 CFR 410.75: that Medicare pays a nurse practitioner for professional services only when personally performed and bars a facility or other provider from being paid for furnishing them, and the collaboration condition as a condition on practice rather than a grant of billing identity.. A collaboration agreement changes who consults with whom. It does not change who saw the patient, and the claim asks about the patient.

"Credentialing pending" is a fact about an enrollment file. It says a payer has not finished verifying you and has not set an effective date for your participation. It says nothing about who conducted the visit. Those are two separate questions, and only one of them moves when the file clears.

The collaboration requirement gets read backwards here. Medicare covers a nurse practitioner's services only where the nurse practitioner performs them while working in collaboration with a physician, and where the state has a law governing it. Collaboration in that regulation is a process of working with one or more physicians to deliver care within the scope of the practitioner's expertise, with medical direction and appropriate supervision as provided for in jointly developed guidelines or other mechanisms provided by the law of the state 1Ref 1Office of the Federal Register / Centers for Medicare & Medicaid Services (2026).§ 410.75 Nurse practitioners' services..42 CFR 410.75: that Medicare pays a nurse practitioner for professional services only when personally performed and bars a facility or other provider from being paid for furnishing them, and the collaboration condition as a condition on practice rather than a grant of billing identity.. The regulation conditions how the nurse practitioner may practice. It confers no share of the physician's billing identity.

Whether the collaborator has to be a psychiatrist at all is a different question, and the psychiatrist requirement for pmhnp collaborators turns on the state's own rule rather than on anything in Medicare's payment provisions.

What the rendering NPI on a claim represents

A claim is a set of assertions, and one of them is who furnished the service. Medicare requires an enrolled provider submitting a paper or electronic claim to include its own NPI and the NPI of any other provider identified on that claim, and a contractor rejects the claim when a required NPI is not reported 2Ref 2Office of the Federal Register / Centers for Medicare & Medicaid Services (2026).42 CFR 424.506 — National Provider Identifier (NPI) on all enrollment applications and claims.42 CFR 424.506(c): that a claim must carry the submitter's NPI and the NPI of any other provider identified on it, and that a contractor rejects a claim missing a required NPI, used to establish that the rendering identity is a representation on the claim.. The identity in the rendering field is a statement of fact the payer relies on.

Two identities travel on a professional claim. The billing provider is who gets paid, which for an incorporated practice is the organizational number and for a sole proprietor can be the individual one; npi-1 and npi-2 are the names for those two kinds. The rendering provider is the clinician who personally performed the service. Rendering vs billing npi is the distinction this question turns on.

Substituting a name in the rendering field is where the misstatement happens. The OIG's roadmap for new physicians lists billing for services you did not actually render among its examples of improper claims, and records a case in which a psychiatrist was fined $400,000 and permanently excluded from the federal health care programs, partly for representing that he provided therapy sessions a non-licensed individual had conducted 3Ref 3U.S. Department of Health & Human Services, Office of Inspector General (2026).A Roadmap for New Physicians: Avoiding Medicare and Medicaid Fraud and Abuse.OIG's plain-language framing: misrepresenting who furnished a service as an improper claim, the $400,000 fine and permanent exclusion case example, the civil False Claims Act knowledge standard including deliberate ignorance and reckless disregard, and the enrolled provider's responsibility for claims submitted under their number.. That case was not a credentialing gap, and the person conducting the sessions was not licensed. But the shape is the same: the claim named a clinician who did not do the work.

Incident-to is the one route by which a physician's NPI carries another clinician's work

One lawful arrangement does let a physician's number carry a service the physician did not personally perform, and it is incident to billing. The conditions are written out in the regulation: a noninstitutional setting, services furnished under direct supervision, with general supervision permitted for behavioral health services and designated care management, auxiliary personnel qualified under state law, and a physician service that initiated the course of treatment 4Ref 4Office of the Federal Register (2026).42 CFR 410.26 — Services and supplies incident to a physician's professional services.42 CFR 410.26: the incident-to conditions, including the noninstitutional setting, direct supervision with general supervision for behavioral health and designated care management, state-law qualification of auxiliary personnel, the initiating physician service, and the rule that only the supervising physician or other practitioner may bill..

The route ends in the wrong place for this question. Only the supervising physician, or other supervising practitioner, may bill Medicare for incident-to services 4Ref 4Office of the Federal Register (2026).42 CFR 410.26 — Services and supplies incident to a physician's professional services.42 CFR 410.26: the incident-to conditions, including the noninstitutional setting, direct supervision with general supervision for behavioral health and designated care management, state-law qualification of auxiliary personnel, the initiating physician service, and the rule that only the supervising physician or other practitioner may bill.. So the claim is the physician's claim, submitted by the physician's practice, for a patient the physician has already personally treated. It is not a mechanism for paying an unenrolled nurse practitioner for the nurse practitioner's own patients while an application sits in a queue.

Whether any version of it fits a practice the nurse practitioner owns is its own question, and incident-to billing in an np-owned practice is where that gets worked out. Commercial plans write their own incident-to terms, so on that side the participation agreement controls.

What the False Claims Act asks, and what it does not

The Act asks whether the claim was false and whether the person submitting it knew, and it sets the knowledge bar low. The OIG states plainly that no specific intent to defraud is required under the civil False Claims Act, and that knowing covers deliberate ignorance or reckless disregard of the truth or falsity of the information 3Ref 3U.S. Department of Health & Human Services, Office of Inspector General (2026).A Roadmap for New Physicians: Avoiding Medicare and Medicaid Fraud and Abuse.OIG's plain-language framing: misrepresenting who furnished a service as an improper claim, the $400,000 fine and permanent exclusion case example, the civil False Claims Act knowledge standard including deliberate ignorance and reckless disregard, and the enrolled provider's responsibility for claims submitted under their number..

Two answers feel exculpatory in the moment: that the biller set it up this way, or that everyone does it while credentialing runs. Neither reaches the element it is aimed at.

The price is set outside that booklet and it moves. Read on September 1, 2026, the Justice Department's inflation-adjusted table sets the civil penalty for a False Claims Act violation occurring after November 2, 2015 at a minimum of $14,308 and a maximum of $28,619 per violation, for penalties assessed after July 3, 2025 5Ref 5Office of the Federal Register / U.S. Department of Justice (2025).28 CFR 85.5 — Adjustments to penalties for violations occurring after November 2, 2015.DOJ's inflation-adjusted civil penalty range per False Claims Act violation, read on 2026-09-01: a minimum of $14,308 and a maximum of $28,619 for penalties assessed after July 3, 2025 on violations occurring after November 2, 2015, re-adjusted annually and additional to treble damages.. The range is re-adjusted annually, so the figure you read today is not the figure that governs an assessment two years out. The amounts sit on top of three times the government's damages, and they attach per violation rather than per audit.

That statute reaches claims to the federal health care programs. A commercial plan's remedy for a misidentified rendering provider lives in the participation agreement, and what it permits the plan to do is a question about that document.

If claims have already gone out that way, that is the trigger for a health care attorney and a repayment analysis, before the next batch and before a silent correction. The scope of any refund obligation turns on facts and dates a page cannot see.

Your collaborator signed the certification too

The physician whose number would carry the claim already made a promise in writing. Certification 8 in Section 15A of the CMS-855I, the individual Medicare enrollment application, is an undertaking not to knowingly present or cause to be presented a false or fraudulent claim for payment by Medicare, and not to submit claims with deliberate ignorance or reckless disregard of their truth or falsity 6Ref 6Centers for Medicare & Medicaid Services (2026).Form CMS-855I — Medicare Enrollment Application: Physicians and Non-Physician Practitioners.The CMS-855I individual enrollment application, and specifically the Section 15A certification not to knowingly present or cause to be presented a false or fraudulent claim or to submit claims with deliberate ignorance or reckless disregard of their truth or falsity..

The OIG puts the same duty in one line: an enrolled provider is responsible for ensuring that claims submitted under that provider's number are true and correct 3Ref 3U.S. Department of Health & Human Services, Office of Inspector General (2026).A Roadmap for New Physicians: Avoiding Medicare and Medicaid Fraud and Abuse.OIG's plain-language framing: misrepresenting who furnished a service as an improper claim, the $400,000 fine and permanent exclusion case example, the civil False Claims Act knowledge standard including deliberate ignorance and reckless disregard, and the enrolled provider's responsibility for claims submitted under their number..

"Cause to be presented" is the phrase doing the work. A physician who agrees to let a nurse practitioner's visits run under the physician's number has not stepped away from those claims. The number on them is the physician's, the certification behind the number is the physician's, and the enrollment file that answers for them is the physician's too.

The exposure therefore lands on two enrollment records, which is the part worth saying to the physician being asked. It is the same borrowed-credential shape as prescribing under a collaborator's dea number, and the same shape that npi billing for 1099 moonlighting raises when a second employer's number is the one on offer.

What to do while the enrollment is pending

Hold the claims and bill them from your own number once an effective date exists, and use the retrospective window where it applies. Medicare permits a non-physician practitioner to bill retrospectively for services provided at the enrolled practice location for up to thirty days before the effective date where circumstances precluded enrolling in advance, and up to ninety days where a Presidentially-declared Stafford Act disaster did, in both cases only where all program requirements including state licensure were met 7Ref 7Office of the Federal Register / Centers for Medicare & Medicaid Services (2026).42 CFR 424.521 — Request for payment by certain provider and supplier types.42 CFR 424.521: that non-physician practitioners may retrospectively bill up to thirty days before their effective date, or ninety days for a Presidentially-declared Stafford Act disaster, only where all program requirements including state licensure were met..

What the wait needs is a calendar and a written record of dates.

• Get the effective date from the enrollment record itself, then count the retrospective window backwards from that date rather than from the day the approval letter arrived.
• Hold the claim rather than substitute an identity on it. A held claim is a cash flow problem with a date on it; a submitted one is a representation.
• Check each payer's timely filing limit before the hold gets long, since that clock runs from the date of service and not from your effective date.
• For a commercial plan, read the effective date and any retroactivity language in the participation agreement, then ask the credentialing contact in writing whether dates of service before that date will be accepted.
• For state Medicaid, read your own state's provider manual on whether a rendering provider who is not enrolled may appear on a claim at all. Those programs set their own rules and they differ.
• Medicare has two narrow substitution arrangements, fee-for-time compensation, commonly called locum tenens, and reciprocal billing, with the conditions set out in the Medicare Claims Processing Manual. Read them there before assuming either one reaches an enrollment gap.

Put the effective date into the billing system and the calendar on the day it arrives, and bill forward from there.