When Your Doctor Travels, Does Your Billing Compliance Stay Behind?

By Olga Khabinskay, Director of Operations, WCH Service Bureau

This article is an expanded version of a piece originally published in Medical Economics.

Many physicians assume that being reachable by phone is enough to keep billing running smoothly while they travel. It sounds reasonable — after all, modern medicine runs on remote communication, and a quick call or text feels like adequate supervision. Under Medicare’s incident-to billing rules, however, that assumption is not just incorrect. It can expose a practice to penalties that threaten its financial survival.

Incident-to billing allows practices to bill services provided by nonphysician practitioners — nurse practitioners, physician assistants, and other qualified clinical staff — at the higher physician reimbursement rate. The arrangement makes sense economically: NPPs deliver a substantial portion of day-to-day patient care, and billing at the physician rate helps practices sustain the revenue needed to operate. But the arrangement comes with a condition that many practices fail to fully internalize until an audit makes it impossible to ignore.

The supervising physician must be physically present in the office suite and immediately available to intervene. Not available by phone. Not in a nearby building. Not in the parking lot. Present in the suite itself, able to respond within moments if needed. This requirement is codified in 42 CFR § 410.26 and elaborated in the Medicare Benefit Policy Manual, Chapter 15, Section 60.1. It is not a guideline or a best practice — it is a mandatory condition of billing. The moment a supervising physician leaves that suite, incident-to billing becomes impermissible for the duration of that absence, whether they have stepped out for an hour or departed for two weeks abroad.

What an Audit Actually Looks Like

Consider a scenario that is more common than most practitioners realize. A physician travels internationally for a conference or personal vacation. Back at the practice, the scheduling continues, NPPs see patients, and billing staff — perhaps unaware of the physician’s absence, or perhaps hoping the rules are more flexible than they are — continue submitting claims under the physician’s name. Months later, a Medicare Administrative Contractor initiates a postpayment audit.

Auditors do not simply review charts. They cross-reference medical record timestamps against physician appointment calendars, examine staff scheduling logs, analyze billing patterns for anomalies, and can request travel documentation including receipts, itineraries, and flight records. Incident-to claims appearing on dates when the physician had no scheduled appointments are flagged immediately. Whistleblower reports from former employees or competitors can initiate the same scrutiny independently of any routine audit cycle.

The findings in these situations are rarely minor. Every claim submitted during an undocumented absence becomes a potentially false claim under the False Claims Act (31 U.S.C. § 3729). Current per-claim penalties range from approximately $14,308 to $28,619, adjusted annually for inflation, plus treble damages on top. Multiply those figures across weeks of NPP services billed at the physician rate, and the exposure becomes severe. Beyond the financial penalties, practices face full recoupment of improperly billed amounts, potential exclusion from federal healthcare programs, and, in cases of knowing or willful violations, possible criminal prosecution.

The Compliant Alternatives Physicians Often Overlook

Medicare does not leave practices without options. The rules are strict, but they account for the reality that physicians take vacations, attend conferences, and experience illness.

Locum tenens arrangements, governed by 42 CFR § 414.50, allow a substitute physician — an MD or DO, not an NPP — to see the absent physician’s established patients. The substitute bills under the absent physician’s NPI using modifier Q6, and Medicare reimburses at the standard physician fee schedule rate. This arrangement is available for absences of up to 60 continuous days and is explicitly designed for vacation, illness, and continuing education. It requires advance planning and written documentation, but it is straightforward and fully compliant.

Reciprocal billing offers a lighter-weight alternative for shorter or irregular absences. A covering physician — who need not be in the same group practice — can see established patients and bill under the absent physician’s NPI with modifier Q5. This is intended for occasional, unplanned coverage situations, not as a routine mechanism to expand capacity.

When neither arrangement is in place, NPPs retain the option of billing under their own National Provider Identifiers. Medicare reimburses independent NPP services at 85% of the physician fee schedule for most office visits. The revenue reduction is real but modest — and incomparably smaller than the cost of a False Claims Act investigation.

One limitation worth emphasizing clearly: NPPs cannot fill the locum tenens role. Medicare’s locum tenens regulations apply exclusively to physicians. Regardless of an NPP’s experience, qualifications, or tenure with a practice, they cannot step into the supervisory billing role under these rules. This is a point that surprises many practices and one that needs to be understood before travel plans are finalized.

Building a Travel Compliance Protocol

The simplest protection is a written protocol that activates every time a supervising physician plans to be away. Before departure: identify all NPP appointments during the absence, confirm whether locum tenens or reciprocal coverage will be arranged, notify billing staff explicitly that incident-to billing is suspended without that coverage, and document all arrangements in writing. During the absence: verify that all NPP services are billed under the NPP’s own NPI or under the physician’s NPI with the correct modifier where coverage is confirmed. On return: audit claims submitted during the absence and address any errors through voluntary repayment before they become audit findings.

State regulations add a layer of complexity that varies significantly. Some states impose supervision requirements more stringent than Medicare’s, affecting both NPP scope of practice and the permissibility of certain locum tenens arrangements. Review your state medical practice act and seek legal counsel when planning extended absences or more complex coverage arrangements.

Finally, note that CMS flexibilities introduced during the COVID-19 Public Health Emergency — which temporarily permitted virtual supervision via audio and video — have largely expired. As of 2025, standard physical presence requirements are back in full effect. Confirm current rules with your Medicare Administrative Contractor before assuming any flexibility remains.

The compliance calculus here is straightforward. The cost of arranging proper coverage or accepting the standard NPP reimbursement rate is predictable and manageable. The cost of an audit that uncovers weeks of improper incident-to billing is neither. If you have questions about how these requirements apply to your practice’s specific situation, the team at WCH Service Bureau is available to help you build billing processes that hold up under scrutiny — before that scrutiny arrives.