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. The financial stakes here are real: a recurring gap in this area adds up to lost or delayed revenue every month.
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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.
See how Rcmaxis handles the full scope of Nephrology billing on our Nephrology billing services page.
The Monthly Capitation Payment is stratified by the number of face-to-face visits in the month, so reviewers check that the visit count you billed matches the visits documented. A claim at the highest visit tier with fewer visits in the record is an overpayment. Because the MCP is billed once a month per patient, the same error repeats every month for every patient it affects. Because contractors can extrapolate a sample error rate across the full lookback period, a documentation gap that looks minor on paper can become a much larger repayment demand.
The other test is the boundary of the bundle. Services outside the ESRD bundle, such as unrelated illnesses and vascular access procedures, are separately billable only when documented as such. Contractors can look back three years, and a habit of billing separate services that were actually dialysis-related is the pattern that turns into a repayment demand.
The Monthly Capitation Payment is billed once a month per patient, and the visit count decides the code. Build a routine that closes each month cleanly. Before billing, pull each patient's visits for the month from the schedule and the notes, and confirm the count matches the code you're about to bill. Flag patients who were hospitalized, transferred, or missed visits, since those cases change the count.
The routine takes an hour or two per month for a mid-size practice, and it catches the errors that would otherwise repeat quietly. Keep the reconciliation sheet. If a payer asks how you determined a patient's visit tier, the sheet answers the question.
Nephrologists do plenty of legitimate work that isn't part of the monthly payment: vascular access procedures, evaluation of unrelated acute illness, and certain drugs. The risk is on both sides. Miss the separately billable work and you leave revenue behind. Bill dialysis-related work separately and you create an overpayment.
Give your coders a one-page guide with two columns: what's in the monthly bundle and what isn't. Update it when payer rules change. When a new service is added to the practice, decide up front which column it belongs in and write down why.
Patients with advanced kidney disease need a lot of coordination long before they reach dialysis. Care management codes can pay for that work if consent, a care plan, and time are documented. Identify your stage 4 and 5 patients from the EHR, offer enrollment, and track the time. It's better care for the patient, and it pays for work that would otherwise be unpaid.
The physician's claims and the facility's claims depend on the same patients and the same months. Keep an open line with the dialysis facility's billing team, and compare records at least quarterly. Confirm patient status changes, transfers, and hospitalizations, since each affects what can be billed.
When your records and theirs disagree, sort it out before a payer does. It's a cooperative process that protects both parties.
Nephrology revenue stacks across several codes. At 2026 Medicare rates, a full-month dialysis capitation payment (90960) is $372.75, chronic care management (99490) is $66.13 and principal care management (99424) is $87.51. For a chronic kidney disease patient who isn't on dialysis yet, principal care management is often the better fit.
A practice with 100 qualifying CKD patients that bills principal care management every month collects $8,751 a month, or $105,012 a year. Billing it for half of them, because enrollment consent wasn't tracked, leaves $52,506 a year behind.
It's a set monthly amount that covers all dialysis-related physician services, and it varies by the number of visits during the month, according to the article. The visit count has to be documented in the record.
Services for conditions unrelated to ESRD, separately payable drugs, and vascular access procedures such as AV fistula or graft creation and interventional access work, as the article lists. Each needs its own documentation.
The article suggests CCM (99490), PCM (99424), and remote physiologic monitoring where applicable, since CKD stage 4 and 5 patients fit the criteria. Consent and time documentation apply as they do for any care management service.
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Revenue check: Reconciling what was documented against what was billed once a month is one of the highest-return habits a billing team can build. For most practices it's the difference between catching a $10,000 to $25,000 problem early and finding it during an audit.
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