The Transfer DRG Underpayment Hiding in Your Discharges: Post-Acute Care Transfer Policy
- Jun 22
- 6 min read
Most hospital revenue cycle leaders know exactly what a transfer DRG overpayment looks like. It looks like an OIG audit. It looks like a takeback. It looks like a recoupment letter from the MAC. CMS has built decades of edits, audits, and oversight processes designed to catch hospitals that miscode a transfer as a routine discharge and collect a full MS-DRG payment they weren't entitled to.
Here's what most teams don't see as clearly: the policy is asymmetric. CMS has edits to catch overpayments. CMS has none — zero — to catch underpayments. When a hospital codes a patient as discharged to home health or a skilled nursing facility, and that care never actually materializes the way the discharge plan said it would, the hospital is paid the reduced per-diem rate it would have received as a transfer — even though, under the rule, it was owed the full DRG. The recovery is sitting there. Nobody from Medicare is going to tell the hospital to come collect it.
Key Takeaways
The PACT policy reduces hospital payment when patients on qualifying MS-DRGs are discharged early to certain post-acute settings
More than 270 MS-DRGs are currently subject to the policy
CMS has edits to detect overpayments but none to detect underpayments — the recovery burden falls entirely on the hospital
Common underpayment scenarios: home health plans that never started, SNF admissions that didn't happen, continuing care unrelated to the inpatient stay
Condition codes 42 and 43 are the regulatory mechanisms that restore full DRG payment when warranted
The FY 2027 IPPS proposed rule includes changes to the qualifying DRG list — hospital workflows should be updated before October 1, 2026H2: What the Post-Acute Care Transfer Policy Actually Does
What the Post-Acute Care Transfer Policy Actually Does
The Post-Acute Care Transfer (PACT) policy was established by Section 4407 of the Balanced Budget Act of 1997 and is codified at 42 CFR § 412.4(c), (d), and (f). When a Medicare patient is discharged early on a qualifying MS-DRG and continues care in a covered post-acute setting, the hospital is paid a graduated per diem rate instead of the full DRG — twice the per diem on day one, then the per diem rate each subsequent day, up to the full MS-DRG amount.
The qualifying post-acute settings include:
Skilled nursing facilities (discharge status code 03)
Inpatient rehabilitation facilities (status code 62)
Long-term care hospitals (status code 63)
Inpatient psychiatric facilities (status code 65)
Home health agencies, when services begin within 3 days of discharge (status code 06)
Hospice (status codes 50 and 51)
Cancer and children's hospitals
More than 270 MS-DRGs are currently subject to PACT. The policy's intent is sound: avoid paying a hospital the full DRG when the patient's acute care episode was, in practice, incomplete. The execution is where the leak begins.
The Asymmetric Edit Problem
This is the single most important sentence in this blog: CMS's claim-processing system has edits designed to identify when hospitals are overpaid under PACT. It has no edits to identify when hospitals are underpaid.
The 2020 OIG report that found Medicare overpaid hospitals more than $267 million under PACT exists because CMS actively looks for overpayments. There is no parallel report on the underpayment side, because there is no parallel infrastructure looking. The responsibility for identifying underpayments — every single one — falls on the hospital. The 2020 OIG report was followed by two additional audits in February 2024 — finding another $41.4 million and $54.4 million in overpayments respectively. There is still no parallel report on the underpayment side, because there is still no parallel infrastructure looking.
That asymmetry shapes every operational reality that follows.
Where the Underpayments Actually Hide
Five places, in order of how often they slip past revenue cycle teams:
The home health plan that never started. The discharge plan called for home health within 3 days. The patient never actually received services — they refused, missed the start window, or were never seen. The claim was coded as status 06, the per diem was applied, and the recovery sits unclaimed.
The SNF admission that didn't happen. Patient was discharged with a SNF placement. The patient went home instead, or the placement fell through. The status code wasn't corrected. The hospital absorbed a transfer reduction it didn't owe.
Home health continuing care unrelated to the inpatient stay. A patient was already receiving home health for a chronic condition before admission. After discharge, services resumed — but for the pre-existing condition, not the inpatient diagnosis. Without condition code 42, this looks like a PACT transfer. With it, the hospital is owed the full DRG.
Late changes to the post-acute plan. The original discharge order specified one post-acute setting. The actual care path went somewhere else, or nowhere at all. The claim was never adjusted.
The 3-day home health window that wasn't met. The discharge plan called for home health, but services didn't start within 3 days of discharge. Condition code 43 applies — and the hospital is owed the full DRG.
Two Condition Codes That Quietly Recover Revenue
For hospitals doing PACT recovery work, two condition codes do most of the heavy lifting:
Condition Code 42 — Used when a patient is discharged to home with home health services, but the continuing care is not related to the condition or diagnosis treated during the inpatient stay. Properly applied, this converts what looks like a transfer into a discharge eligible for full DRG payment.
Condition Code 43 — Used when continuing care was not provided within the prescribed post-discharge window. Properly applied, this also restores full DRG payment.
These are not loopholes. They are the regulatory mechanisms CMS itself built to ensure hospitals are paid correctly when the discharge plan and the actual post-acute care path diverge. The problem is that applying them requires post-discharge verification — calls to home health agencies, reconciliation of actual care delivered, validation that services were unrelated or untimely. Most hospitals don't have the workflow to do this systematically.
A Fresh Wrinkle in the FY 2027 IPPS Proposed Rule
The FY 2027 IPPS proposed rule, published in the Federal Register on April 14, 2026, includes proposed changes to the MS-DRGs subject to the post-acute care transfer policy and the MS-DRG special payments policies. Hospitals should expect the qualifying DRG list to shift again for FY 2027 — and any process that depends on a fixed list of "transfer DRGs" baked into legacy workflows is going to need a refresh before October 1, 2026.
Why Physician-Led Review Changes the Recovery Equation
The two highest-value recovery scenarios — applying condition code 42 (unrelated continuing care) and validating actual post-acute care delivery — both require clinical judgment. Is the home health care being delivered for the inpatient diagnosis or for an unrelated chronic condition? Was the care actually rendered, or was it ordered and never started? These are not coding questions. They are clinical questions that a coder, alone, cannot answer with confidence.
Physician-led oversight is what turns a transfer DRG recovery program from a coding exercise into a clinically defensible revenue stream. RevCure's physician leaders bring the clinical credentials — RHIA, CCS, CCDS, CRCR — and the post-acute care fluency that the recovery work actually requires.
What to Do in the Next 60 Days
Audit the last 12 months of PACT-eligible discharges. Specifically, the ones coded to home health and SNF. Pull a sample and verify whether the planned care actually happened.
Build a condition code 42 / 43 workflow. A small number of cases per month, applied correctly, recover meaningful revenue.
Establish a 30-day post-discharge verification process. Calls to home health agencies and SNFs to confirm actual care delivered.
Review the FY 2027 IPPS proposed rule's PACT changes. Make sure your DRG list isn't going to drift out of sync on October 1.
Transfer DRG underpayments are not a CMS problem. They are a hospital opportunity, and only a hospital with the right workflow will collect them. RevCure's physician-led team can audit your last 12 months of PACT-eligible discharges, identify the underpayments hiding in your discharge codes, and build the verification process that catches them going forward.
Frequently Asked Questions About the Post-Acute Care Transfer (PACT) Policy
1. What is the Post-Acute Care Transfer (PACT) policy?
A Medicare payment rule, established under the Balanced Budget Act of 1997 and codified at 42 CFR § 412.4, that reduces hospital payment on qualifying MS-DRGs when patients are discharged early to certain post-acute care settings.
2. Which post-acute settings trigger PACT?
Skilled nursing facilities, inpatient rehabilitation facilities, long-term care hospitals, inpatient psychiatric facilities, hospice, cancer and children's hospitals, and home health agencies when services begin within 3 days of discharge.
3. How are PACT-affected hospitals paid?
A graduated per diem rate: twice the per diem on day one, then the per diem rate each subsequent day, up to the full MS-DRG amount.
4. Why are underpayments so common?
CMS has built claim-processing edits to detect overpayments but not underpayments. When discharge plans don't materialize as expected — home health never starts, SNF placement falls through — the burden of identifying and recovering the underpayment falls entirely on the hospital.
5. What are condition codes 42 and 43?
Condition code 42 applies when home health services after discharge are unrelated to the inpatient diagnosis. Code 43 applies when continuing care was not provided within the prescribed post-discharge window. Either, properly applied, restores full DRG payment.
6. What's changing in FY 2027?
The FY 2027 IPPS proposed rule, published April 14, 2026, includes proposed changes to the MS-DRGs subject to PACT. The qualifying DRG list is likely to shift effective October 1, 2026.
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