Reviewed by Hassan Raza Awan, Founder — 4+ years of hands-on U.S. medical billing experience. General billing information — verify against current CMS guidance and your payer contracts.
Place of Service 65 identifies a freestanding ESRD treatment facility — the outpatient dialysis center where patients with end-stage renal disease receive maintenance hemodialysis. Use it when services happen at the dialysis center itself. Home dialysis services are reported with the home place of service (POS 12), and dialysis delivered during an inpatient stay belongs to the hospital's billing, not POS 65. As always, the POS follows where the patient physically received care.
When a patient with employer group coverage develops ESRD and becomes Medicare-eligible, Medicare does not immediately take over. For 30 months from Medicare eligibility, the employer plan stays primary and Medicare pays secondary — then, at month 31, they swap. The billing consequences are mechanical and unforgiving: claims sent to Medicare as primary during the coordination period deny or, worse, pay incorrectly and generate recoupments later; claims sent to the employer plan after the swap bounce back months down the line. The practical system: record the coordination period's start date in the patient's file the day dialysis begins, calendar the month-31 flip, and verify the primary payer at every monthly eligibility check rather than assuming continuity. Watch the edge cases too — the patient who loses employer coverage mid-period (Medicare becomes primary early), the transplant that changes the timeline, and Medicare Advantage enrollment rules that have shifted in recent years. A dialysis practice with twenty coordination-period patients is running twenty separate countdown clocks, and a missed flip on one patient is a quarter's worth of rework. Build the countdown into the chart the day dialysis begins, assign one owner for the monthly eligibility check, and the whole coordination problem quietly disappears into normal monthly routine.
The single biggest source of rejected lines on POS 65 claims is billing separately for something the ESRD Prospective Payment System already covers. Since 2011 Medicare has paid dialysis facilities a single bundled rate per treatment, and that bundle is far wider than most billers expect.
It includes the dialysis treatment itself, all ESRD-related drugs and biologicals — including erythropoiesis-stimulating agents, vitamin D analogues and iron products that were separately payable before the bundle — all ESRD-related laboratory tests, and the supplies and equipment used to deliver the treatment. Submitting an ESA or a routine dialysis lab panel as its own line does not earn additional payment; it produces a denial on a service that was genuinely provided and already reimbursed.
Adjustments then move the bundled rate up or down. Facility-level adjustments account for wage index and low-volume or rural status. Patient-level adjustments account for age, body surface area, body mass index, time on dialysis and certain comorbidities. There is also a training add-on for home dialysis and self-care training, and an outlier payment where the cost of eligible items and services exceeds a defined threshold. Those adjustments only pay if the corresponding data is captured on the claim, which makes accurate patient-level reporting a direct revenue issue rather than an administrative one.
Since 2017, certified ESRD facilities have been permitted to treat Medicare beneficiaries with acute kidney injury rather than end-stage renal disease — and those claims do not follow ESRD rules. AKI treatments are paid at the ESRD base rate, but without the case-mix adjustments, without the training add-on and without the outlier payment that apply to ESRD patients. Drugs, labs and supplies that would be bundled for an ESRD patient may be separately billable for an AKI patient.
The practical consequence is that two patients dialysed in the same chair on the same afternoon can require two entirely different billing approaches. Treating an AKI patient as an ESRD patient bundles services that should have been paid separately and quietly loses revenue on every treatment; treating an ESRD patient as AKI produces separately billed lines that will be denied as already included. The condition, not the setting, decides the rules.
Related: Nephrology billing services · POS 12 — home · CO-22 — coordination of benefits · Full POS library
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Reviewed by Hassan Raza Awan, Founder — 4+ years of hands-on U.S. medical billing experience. General billing information — verify against current CMS guidance and your payer contracts.
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