Medicare Will Recheck Your 2023–2024 Nursing Home Visits Billed With POS 32: Paid Does Not Mean Closed

Think about the last nursing home visit your practice billed in 2023. The claim went out, Medicare paid it, your team posted the payment, and the account went quiet. In most practices that claim is treated the way a discharged patient is treated: case closed, chart filed, nobody expects to hear about it again.

Medicare does not see it that way. On October 8, 2026, CMS issued Change Request 14582 (Transmittal 13995) instructing its claims system — the Common Working File, the shared record every Medicare claim is checked against — to run a one-time search through Part B claims from May 11, 2023 through December 31, 2024. The search looks for one specific pattern: claim lines billed with place of service (POS) code 32 whose dates fall inside a covered Medicare Part A skilled nursing facility stay, or a swing bed stay (excluding swing beds in critical access hospitals). Where the pattern matches, Medicare Administrative Contractors (MACs) will reprocess the claims and recover any overpayment through their standard recoupment procedures. The instruction is effective April 1, 2027, with implementation on April 5, 2027.

That is the whole news. Everything else in this article is about why one two-digit code creates an overpayment, why CMS is reaching back to 2023 to find it, and what a small practice can check now, while the check is still free.

One digit, two different rates

Place of service is the two-digit code on every professional claim line that tells Medicare where the service happened. It sounds like geography. It is actually payment logic, because Medicare pays many services at two different rates: a facility rate, which is lower because the facility is already being paid for the room, the staff and the overhead, and a nonfacility rate, which is higher because the practice absorbed those costs itself.

For visits in nursing settings, CMS guidance (MLN Matters MM13767) draws the line this way. Use POS 31 — skilled nursing facility — for services provided during a patient's Medicare Part A stay. Use POS 32 — nursing facility — for services in a nursing facility, and for services in a skilled nursing facility once the patient has exhausted Part A coverage. In a mixed facility, one building with both nursing and skilled beds, use POS 31 unless the physician can verify that Medicare will not make a Part A payment.

The trap is built into the definitions. The same doctor, seeing the same patient, in the same bed, in the same building, owes Medicare a different code depending on a fact the doctor usually cannot see: whether that day falls inside a covered Part A stay. It is the billing version of a distinction every physician already lives with clinically — the same patient in the same bed is an inpatient or an observation patient depending on a status decision made elsewhere, and the status, not the care, drives the payment. A POS code is the claim's status field. Get the status wrong and the care was fine but the payment was not.

When POS 32 is reported for a patient who is actually in a covered Part A stay, Medicare pays the higher nonfacility rate for a service it should have priced at the facility rate. The difference on a single visit is modest. Multiplied across every rounding day, every clinician and every month, it stops being modest.

Why CMS is going back to 2023

This did not start with the October transmittal. In May 2023, the HHS Office of Inspector General (OIG) published a report (A-04-21-04084) estimating that Medicare had overpaid about $22.5 million on more than 1.1 million claim lines in 2019 and 2020 for exactly this pattern — physician services billed with POS 32 while the patient was in a Part A stay — and that Medicare's systems had no edit in place to catch it.

CMS built the edit in stages. Under Change Request 13767, the front-end protection now works like this for current claims: if a professional claim with POS 32 overlaps a previously processed Part A SNF claim, the claim comes back unprocessable (the remittance carries claim adjustment reason code 58, treatment deemed rendered in an inappropriate place of service). If the professional claim was paid first and the SNF claim posts afterwards, the system identifies the paid claim and an adjustment follows, repricing it to the POS 31 facility rate.

What that machinery did not cover is the window before it existed. Claims from May 11, 2023 through December 31, 2024 were paid in a period when the overlap could pass unnoticed. Change Request 14582 is the cleanup instruction for that window: the same overlap check, run once, backwards. This is not a new rule about which code to use — the POS 31/POS 32 rule has been the rule all along. It is a new look at old claims under the old rule.

How the money comes back

There will not be a knock on the door. Recoupment through standard procedures usually means the MAC reprocesses the claim at the corrected rate and recovers the difference by offset — reducing future Medicare payments until the balance is cleared. On a remittance advice full of current claims, an adjustment on a 2023 visit is easy to miss and hard to trace, which is precisely why practices that prepare tend to fare better than practices that discover.

Two things are worth keeping straight. First, an adjustment is not an accusation. The recheck is automated and pattern-based; it does not allege that anyone intended anything. Second, the recheck is designed to find a defined pattern, not to review your medicine. The exposure question is narrow and factual: was this date of service inside a covered Part A stay, yes or no?

The check you can run now, before April 2027

A practice does not need to wait for the MAC to answer that question. The same list CMS will build can be built in-house, in an afternoon, from data the practice already has:

• Pull every Medicare Part B claim line billed with POS 32 with a date of service from May 11, 2023 through December 31, 2024. Group the lines by facility and by patient.
• Ask each facility for those patients' Part A stay dates: admission, discharge, and the date Part A coverage ended, if it ended before discharge. This is the one piece of data that lives with the facility, not with your practice — ask for it in writing and keep the answer on file.
• Flag every line whose date of service falls inside a covered Part A stay. Those are the lines the recheck is designed to find.
• Estimate the size honestly: for the flagged codes, compare the nonfacility amount Medicare paid against the facility-rate amount for the same code, year and locality. That difference, line by line, is a reasonable first estimate of what could be taken back — an estimate for planning, not a number to book as fact.
• Fix the front end while you are in the files: get each patient's Part A status from the facility at the time of the visit, not from habit, and in mixed facilities default to POS 31 unless the physician has verified that Part A will not pay. A default code per facility, set once and never revisited, is how most of these claims were created.
• From April 2027, match every Medicare adjustment against your flagged list. Where your records show the patient was not in a covered Part A stay, use the normal appeals path — a redetermination request is generally due within 120 days of the remittance notice. Where the records agree with the adjustment, let it close and make sure the front-end fix held.

If the review turns up a pattern rather than a handful of lines, that is the moment to bring in your compliance adviser and discuss how the overpayment rules apply to what you found. Finding it yourself, in October 2026, is a different conversation from being handed the same list by a contractor in April 2027.

Our reading

The fact is the transmittal: a one-time recheck, a defined window, reprocessing and standard recoupment starting April 2027. Our reading at Healthcode RCM is that this is where Medicare payment policy has been heading for several years — edits move from education, to rejection at the door, to a look backwards at what slipped through before the door existed. A paid claim used to feel like the end of the story because, operationally, it usually was. Increasingly it is a claim Medicare has not finished checking. Practices do not need to fear that shift. They need one habit to match it: when CMS announces a pattern, pull your own claims for that pattern first. The list is the same either way. The only question is who builds it first, and on whose schedule.

A paid claim is not a closed claim — it is a claim Medicare has not finished checking. Pull your list before Medicare pulls it for you.