Nephrology has one of the most distinctive billing structures in medicine. The ESRD monthly capitation model covers dialysis-related services as a bundle, but plenty of nephrology work falls outside that bundle — and that's where billing mistakes accumulate.
If you're working through these issues, our specialty billing services can help you address them systematically.
For patients on dialysis, Medicare pays nephrologists through the Monthly Capitation Payment (MCP) — a set monthly amount that covers all dialysis-related physician services. The MCP amount varies based on the number of visits the physician documents in the month:
This seems simple but creates a billing trap: if your nephrologist sees the patient four times but documentation only captures three encounters, you're billing at the lower rate without knowing it. Audit your visit counts monthly.
The ESRD bundled payment covers dialysis-related services. The following are separately billable even for ESRD patients:
The documentation burden here is real. When you see an ESRD patient for a non-dialysis issue, your note has to make clear that the service is for the separate condition. "Patient here for blood pressure management" won't cut it when the patient also has ESRD — you need to explicitly state the service is unrelated to the renal disease.
AV fistula creation, AV graft placement, and access revisions are surgical procedures with their own CPT codes (36818–36833 for fistula/graft surgery, 36901–36909 for interventional procedures). These are outside the ESRD bundle. They require documentation of the specific procedure performed, the access used or created, and any complications.
Interventional nephrology is a growing area — many nephrologists now perform fistuloplasty and thrombectomy procedures. These require separate credentialing and specific CPT coding. Billing a 36902 (fistuloplasty) without interventional privileges is a compliance problem, not just a billing one.
Kidney transplant evaluation and preparation involves E&M services that are separately billable. Post-transplant management in the first year is typically covered under the transplant surgeon's global period or separately billed by the nephrologist managing the immunosuppression and follow-up care. Make sure it's clear which physician is doing what — overlap in billing the same service from the same date is a denial trigger.
Non-ESRD nephrology care is standard E&M billing, but CKD patients often benefit from care management codes — CCM (99490), PCM (99424), and remote physiologic monitoring where applicable. CKD Stage 4-5 patients are exactly the high-complexity chronic condition patients these codes were designed for. Track the monthly care management time and bill it.
Nephrology consultations during hospitalizations for AKI use inpatient consultation codes — or if your group is the primary admitting team, initial inpatient codes (99221–99223). Document the complexity of the kidney involvement, the diagnostic data reviewed (creatinine trends, GFR calculations, urine studies), and the management plan. AKI with multiple organ involvement justifies high-complexity MDM.
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