Incident-To Billing When the Physician Is Reachable Only by Phone
A 12-physician cardiology group employs a nurse practitioner (NP) who is credentialed with Medicare. The group bills all NP visits under the collaborating physician's NPI at 100% of the physician fee schedule, with no modifier. The physician is usually at the hospital during clinic hours but is reachable by phone. For 20 sampled visits, the NP saw established patients with CHF. In 14 visits, the NP managed a new problem, such as new atrial fibrillation or worsening renal function, and changed medications without a prior physician plan. In 6 visits, the NP followed a documented plan the physician had established at the prior visit. In all 20, the physician was not physically present in the office suite; in 8, the NP called the physician and the physician agreed with the plan. The group's compliance officer asks whether the billing is supportable as incident-to services.
1. Are these services billable incident-to the physician? Explain the requirements.
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No. None of the 20 visits meets the incident-to requirements as described.
Medicare incident-to rules require all of the following:
- The service is an integral part of the physician's course of treatment.
- The patient is established for the billing physician.
- The physician has established a plan of care.
- The physician provides direct supervision-physically present in the office suite and immediately available to furnish assistance and direction.
- The service is documented appropriately.
Phone availability is not direct supervision. Because the physician was not in the office suite for any of the 20 visits, the supervision requirement fails for all 20. The 14 visits involving new problems and medication changes also fail the plan-of-care requirement. Even the 6 visits that followed a prior physician plan fail because direct supervision was absent.
Billing under the physician NPI at 100% is therefore not supportable. The fact that the NP called the physician in 8 visits does not cure the defect; a phone call is not physical presence.
2. What are the compliant billing options and the financial exposure?
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The group should rebill the services under the NP's NPI if the NP is credentialed, the services are within state scope, and the payer permits NP billing. Medicare generally pays NP services at 85% of the physician fee schedule. The financial exposure is therefore the difference between the physician-rate payment and the NP-rate payment, plus any claims that cannot be rebilled at all.
The auditor should:
- Pull the allowed amounts for each of the 20 claims.
- Recalculate at the NP rate and compute the overpayment.
- Check timely filing and payer rules; some claims may be too old to rebill.
- Confirm whether any visit could be billed by the physician personally-none appear to qualify here.
- Review the group's broader claims history for the same pattern, because the sample suggests a system-wide policy rather than isolated errors.
If the NP is not credentialed with a payer, those services may be non-billable, increasing exposure. The group should not simply add a modifier to the existing physician claims; the issue is the billing NPI and supervision, not modifier selection.
3. What process controls should the group implement to prevent recurrence?
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The group should implement both scheduling and billing controls:
- Supervision attestation: require the supervising physician to document physical presence in the office suite when NP services are billed incident-to.
- Schedule design: do not book incident-to visits when the physician is assigned to the hospital unless a substitute supervisor is physically present.
- EHR flag: add a hard stop or warning when an NP visit is linked to a physician NPI without a same-day supervision attestation.
- Credentialing: ensure every NP is credentialed with each payer and knows when to bill under their own NPI.
- Education: train schedulers, coders, and clinicians on the difference between direct supervision, general supervision, and phone consultation.
- Audit: review a monthly sample of NP claims for billing NPI, supervision, and plan-of-care documentation.
The compliance officer should also determine whether the prior claims require a voluntary refund and whether the pattern resulted from a written policy that must be rescinded.