The deal closed. Sixty days later collections are down thirty percent and nobody can say why.
The first theory is always the clinicians. They are unsettled, they are seeing fewer patients, morale is down. Sometimes that is true and it is almost never thirty percent of the answer.
Check the mechanical causes first, because most of a post-close revenue drop is not clinical and most of it is recoverable if you find it this month rather than next quarter.
Why does revenue drop after a practice acquisition?
Usually because claims stopped flowing correctly rather than because visits stopped happening. Credentialing under a new tax ID, payer enrolment gaps, a changed billing arrangement, and patients who left during the announcement account for most of it, and each one has a different fix and a different recovery window.
Separate two questions before anything else
Are you seeing fewer patients, or are you failing to collect for the patients you saw.
These look identical on a collections report and they are completely different problems. Pull visit volume for the sixty days before close and the sixty days after. If volume held and collections fell, this is a billing and enrolment problem, and the money is still recoverable.
If volume genuinely fell, that is a different article and a slower fix.
Most practices skip this step and spend six weeks addressing a demand problem they do not have.
The five mechanical causes
Credentialing under the new entity. If the acquisition changed the tax ID, every provider needs to be enrolled again with every payer, and claims submitted before that completes will reject or pay to the wrong entity. Enrolment runs on payer timelines rather than yours, and thirty to ninety days per payer is common.
This is the single largest cause of a post-close collections drop and it is entirely predictable. It is also the one most often discovered in month three.
Payer contracts that did not transfer. Contracts are frequently entity-specific. A rate you had before close may not apply after it, and claims can pay at out-of-network rates or at a default fee schedule while everybody assumes the contract carried over.
Check what you are actually being paid per code against what you expected. The difference shows up in remittances long before anybody notices it in a monthly report.
Clearinghouse and submission changes. If the billing arrangement changed at close, claims may be routing differently or not at all. A batch that fails silently is invisible until somebody reconciles submitted against acknowledged.
Remittances arriving somewhere nobody is watching. New bank details, a changed lockbox, a portal nobody has credentials for. The money can be arriving correctly while nothing is posted against it, which reads as a collections drop and is actually a posting gap.
Work in flight that nobody owns. Claims submitted before close, denied after it, appealed by nobody. Same failure as any billing transition, and an acquisition is a billing transition whether or not anybody called it one.
The clinical causes, once the mechanical ones are ruled out
Two are real and both are slower to fix.
Patients who left during the announcement. Some leave when ownership changes, particularly in behavioral health where the relationship is with the clinician rather than the practice. That loss appears months later as visits that would have been booked and were not, so it is invisible in the first sixty days and unmistakable by month five.
Clinicians who are looking. A provider deciding whether to stay behaves differently before they announce it. Booking slows, follow-ups get scheduled less far out, documentation runs later. That is worth watching per provider rather than in aggregate, because the aggregate hides it until the resignation arrives.
What to do in the next thirty days
In this order, because the order matters.
Compare visit volume before and after close. That single comparison tells you which problem you have.
Check credentialing and enrolment status for every provider with every material payer. Get the dates. Anything incomplete is an active leak.
Reconcile submitted claims against acknowledged claims for the post-close period. Silent submission failures are common and easy to miss.
Compare payment per code against the rates you expected. Contracts that did not transfer show up here first.
Count remittances received against payments posted. If the gap is large, the money arrived and nobody recorded it.
Then, and only then, look at whether anything clinical changed.
Why diligence did not catch it
Diligence looks at what the practice earned. It rarely looks at how the practice earns, and those are different questions.
A quality of earnings exercise will test the receivables and normalise the numbers. It will not usually tell you that eleven providers need re-credentialing under a new tax ID, that four payer contracts are entity-specific, or that the seller’s billing arrangement ends at close with no agreement about claims in flight.
Those are operational facts rather than financial ones, and they are the ones that produce the drop. It is the same gap that appears when a buyer reads the seller’s receivables.
Which is worth knowing before the next deal, because every item on the list above can be checked before close and fixed before it costs anything.
What this means for you
Volume first, then enrolment, then submission, then rates, then posting. Most post-close revenue drops resolve into those five, and most of the money is recoverable if the check happens in month two rather than month five.
The clinical questions are real and they come after, because they are slower to fix and they are rarely thirty percent of the answer.
If you want a second pair of eyes on where the drop actually is, grab 30 minutes with us. Prep nothing. You will see whether you are seeing fewer patients or failing to collect for the ones you saw.
Questions people ask
Why does revenue drop after a practice acquisition?
Usually because claims stopped flowing correctly rather than because visits stopped happening. Credentialing under a new tax ID, payer contracts that did not transfer, submission changes, and unposted remittances account for most of it, and each has a different fix.
How do I tell if the drop is volume or collections?
Compare visit volume for the sixty days before close against the sixty days after. If volume held and collections fell, this is a billing and enrolment problem and the money is still recoverable. If volume fell, it is a slower and different problem.
Does credentialing have to be redone after an acquisition?
If the tax ID changed, yes. Every provider needs enrolment again with every payer, and claims submitted before that completes will reject or pay to the wrong entity. Thirty to ninety days per payer is common, and it runs on the payer’s timeline.
Do payer contracts transfer when a practice is acquired?
Not automatically. Many are entity-specific, so a rate you had before close may not apply after it. Compare payment per code against what you expected, because the difference appears in remittances long before anybody notices it in a monthly report.
Why did diligence not catch this?
Diligence tests what the practice earned rather than how it earns. Re-credentialing exposure, entity-specific contracts, and claims in flight with no owner are operational facts rather than financial ones, and they are the ones that produce the drop.