Three-Day Window Judgment: Three Patients, One Weekend
Lakeside Medical Center is a 260-bed IPPS hospital. It owns 100 percent of Lakeside Physician Group, which bills under the Physician Fee Schedule and sits two blocks from the hospital. Three admissions raise bundling questions. Patient A was admitted Monday, April 14, for a COPD exacerbation; on Saturday, April 12, she had a mole removed at the group practice and a complete blood count drawn there the same day; on Sunday, April 13, she had a chest x-ray and a nebulizer treatment in the hospital's outpatient department. Patient B was admitted April 15 for a hip fracture after a fall; on April 13 she had a screening colonoscopy with a polyp biopsy at the hospital's outpatient GI suite, unrelated to the fracture. Patient C went into observation on April 16 for chest pain, had an EKG and troponins, and converted to inpatient on April 17. The business office has already dropped outpatient claims for these services.
1. For each patient, classify each service as included in the inpatient claim or separately billable, and give the reasoning.
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Patient A. The window is the three calendar days before admission, counting the admission date as day one: April 11, 12, and 13.
- Mole removal, April 12: non-diagnostic and unrelated to the COPD admission, so separately billable - but only if the group practice is not wholly owned (see below).
- Complete blood count drawn at the office, April 12: a diagnostic service inside the window, so bundled into the inpatient claim regardless of clinical relationship.
- Chest x-ray, April 13: diagnostic, bundled.
- Nebulizer treatment, April 13: non-diagnostic, but it treats the COPD and is clinically related to the admission, so bundled.
Patient B. Screening colonoscopy with polyp biopsy on April 13 is a diagnostic service inside the window. The fact that it is unrelated to the hip fracture is irrelevant: diagnostic services are bundled without a relatedness test. Only non-diagnostic services require a clinical relationship.
Patient C. The EKG and troponins during observation are diagnostic services inside the window, and observation itself is a non-diagnostic service clinically related to the admission that follows. All of it belongs to the inpatient claim; it cannot be billed as outpatient once the patient is converted to inpatient.
The organizing principle: diagnostic services are bundled by timing alone; non-diagnostic services are bundled by timing plus clinical relationship.
2. How does the analysis change if the group practice is only 60 percent owned, or if Lakeside were a critical access hospital?
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Partial ownership. The window reaches services furnished by the hospital and by entities wholly owned or wholly operated by it. At 60 percent ownership the group is neither, so the April 12 office services fall outside the bundling rule entirely and both the mole removal and the blood count are separately billable by the practice. The hospital services on April 13 are unaffected and remain bundled. This is why the ownership and operating structure must be confirmed from the corporate documents, not assumed from a common brand name.
Critical access hospital. A CAH is not paid under IPPS, and the payment window shrinks to one calendar day before admission. On these facts, the April 12 and April 13 services would fall outside the window and be separately billable, while a service on the day of admission would still be included. The change is driven by the payment system, not the clinical facts.
A further check regardless of status: the window applies to services the hospital provides or arranges, and to related non-hospital services only under the ownership test. Where a service is furnished under a management or professional services agreement rather than ownership, get the structure in writing before applying the window.
3. The outpatient claims have already been dropped. What corrections are required, and what compliance obligations arise?
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Correction runs in one direction only. For services that belong in the inpatient claim, the hospital must void or cancel the outpatient claim, ensure the charges and costs sit on the inpatient claim, and refund any outpatient payment received. Bundling does not increase the DRG payment; the inpatient payment is unchanged when pre-admission services are folded in, so the net effect of the correction is a payment reduction, not a windfall. That surprises well-meaning staff who assume moving charges increases reimbursement.
Overpayment reporting. Any outpatient payment already received for a bundled service is an identified overpayment and must be reported and returned within 60 days of identification under 42 CFR 401.305. Track the amounts claim by claim and document the refund dates.
Process fixes. Build the ownership and clinical-relationship logic into registration and charge review so the window is applied before claims drop. Document who made each clinical-relationship determination - a MAC reviewer will ask why the nebulizer treatment was treated as related to the COPD admission and will want a clinical basis, not a revenue motive.