A resignation letter arrives with ninety days written on it. Most practices read that as ninety days to find a replacement, and the search starts that afternoon. What the letter actually started is three clocks running at once, and only one of them speeds up when the practice hires faster. The payer contracts have their own notice terms. The medical records have their own custody obligations. And the replacement physician, however quickly signed, cannot bill most of the practice’s payers for months after the departing physician sees the last patient. Practices that plan a departure as a recruiting problem tend to discover the other two clocks after they have already run out.
Three clocks start, not one
The binding constraint on revenue is enrollment, not recruitment. Commercial credentialing and payer enrollment for a physician joining an existing group commonly runs somewhere between three and six months, and the long end is normal for large national networks and narrow-panel specialties. Treat that range as an operating observation rather than a rule: Credentialing and enrollment requirements vary by payer and change frequently, and each payer’s current timeline should be confirmed directly rather than assumed from a house average. Even at the short end, a ninety-day notice period covers at best half of the replacement’s non-billable window, and only if the replacement is identified and signed the week the letter arrives.
The payer side runs its own schedule in parallel, and parts of it are fixed in regulation. Under 42 CFR 422.202(d)(4), a Medicare Advantage organization and a contracting provider must give each other at least sixty days of written notice before terminating the contract without cause. The plan then carries its own obligation to the patients. Under 42 CFR 422.111(e), when the terminating provider is a primary care or behavioral health provider, the plan must send written notice and attempt one telephone call at least forty-five calendar days before the termination effective date; for other specialties, written notice is due at least thirty calendar days out. Those are federal floors for one product line, and commercial agreements frequently sit above them. The practice does not get to choose the order these run in. It only chooses how much of each one it burns before starting the next.
Medicare will not backfill the gap
Medicare revenue for the replacement is anchored to a filing date, not a start date. Under 42 CFR 424.520(d), the effective date of billing privileges is the later of the date the enrollment application was filed and subsequently approved, or the date the physician first began furnishing services at the new location. Under 42 CFR 424.521(a)(1), retrospective billing reaches back thirty days before that effective date only where circumstances precluded enrolling in advance, and the ninety-day version applies only where a presidentially declared disaster under the Stafford Act precluded it. That is a conditional allowance, not a standing thirty-day grace period, and it is not something a practice should plan around.
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The consequence is narrow and expensive. Every week between the replacement’s signed offer and the filed CMS-855I is a week of Medicare volume that no later approval recovers. A file date two weeks after the start date is not a two-week delay. It is a permanent write-off of everything billed before the effective date, whatever the lookback does or does not reach. That is why the date the practice controls is the filing date, not the approval date, and why filing should precede the start date rather than follow it.
The roster is a compliance record
A departure also changes what the practice is permitted to bill and what it is obligated to hand over. Claims submitted under a physician the plan has already removed from its roster are not simply denied. Once the plan reconciles the termination effective date, they become recoupment against future remittances, and that reconciliation routinely lags the departure by months, landing the recovery on a quarter the practice was not planning for. Roster changes should be dated from the last clinical day rather than the last payroll day, and the two reconciled deliberately, because they are almost never the same.
Records carry a parallel obligation. The AMA Code of Medical Ethics places the duty to transfer records or provide copies on the physician and the practice when a physician leaves, and treats withholding a departing physician’s forwarding information from a patient who asks for it as unacceptable. Practices that route patient notification through the departing physician’s own letter, rather than through whoever holds custody of the record, generally learn afterward which patients were never told.
Run the departure as a project
The methodology fits on one page. In the first week of the notice period, four dates get an owner and a hard deadline. The first is the last clinical day, which is the anchor for everything else. The second is a payer notice date for each contracted plan, calculated backward from that anchor by that specific contract’s notice term rather than by a single house rule. The third is a filing date for the replacement’s Medicare and commercial applications, set before the start date, with status tracked weekly rather than checked at the end. The fourth is a records custody date, naming who answers the requests the departing physician used to answer. Tail coverage placement belongs on the same page, dated to the last clinical day. A practice that can name all four dates in week one has turned an HR event into a schedule. A practice that cannot will learn the dates from a denial letter.
The gap does not disappear; enrollment timelines are not something a small practice negotiates. What the practice controls is the spread between the last clinical day and the replacement’s first billable one, and how much of that spread it created itself by treating filing as paperwork to be finished after the hire is final. The number worth writing down is not how much notice the physician gave. It is that spread, measured once, in days. Practices that measure it tend to cut weeks off the next one, because the fix almost always sits in the first two weeks of the notice period rather than the last two. Practices that never measure it repeat it at the same cost.
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