Nephrology Billing Guide: Codes, Processes, and Guidelines
Nephrology billing is the work of turning kidney care into accurate, payable claims. It covers office and hospital visits, chronic kidney disease management, dialysis related physician services, and the monthly capitation payment for patients with end stage renal disease. It is complex because one patient can move between CKD stages, dialysis types, care settings, and payers within a year, and every shift changes the codes and rules that apply. Care RCM supports practices through our Nephrology Billing Services, and this guide covers the essentials your team should have in place.
Key takeaway: Clean nephrology medical billing rests on three habits: the right code for the right care setting, documentation that supports every service, and a monthly review that catches problems before a claim goes out. |
Start by separating two billing lanes. Professional billing covers what the nephrologist personally provides and is reported on a CMS 1500 claim. Dialysis facility billing covers the facility treatment under the ESRD Prospective Payment System and is submitted by the facility, not the physician practice. Blending the two is a frequent source of denials.
For Medicare patients with ESRD, physician management is generally paid as a monthly capitation payment. CPT 90951 through 90970 are the ESRD related service codes. Outpatient codes are chosen by patient age and the number of face to face visits in the month, while home dialysis uses 90963 to 90966 for a full month and 90967 to 90970 for a partial month. Medicare pays only one monthly capitation service per patient per calendar month, even when several physicians share care. Submit after the month ends and follow your MAC instructions on dates of service, which differ for the first month of dialysis.
Category and examples | Used for | Documentation should show | Common caution |
CKD and ESRD diagnoses: N18.4, N18.6, I12.0, Z99.2 | Reporting kidney disease stage and dialysis dependence | Documented stage or ESRD status, and any linked hypertension or diabetes | Do not use unspecified CKD when a stage is documented. Hypertension with CKD uses a combination code. |
Evaluation and management: 99213, 99214 | Visits outside the monthly capitation scope | Medical necessity, plus decision making or time | ESRD related care is bundled into the monthly payment, so review before billing a visit. |
ESRD monthly capitation: 90960 to 90962, 90966 | Monthly dialysis management for patients 20 and older | Visit count, age, dialysis setting, and a complete monthly assessment | Only one per patient per month. Early submission is rejected. |
Partial month ESRD: 90967 to 90970 | Home dialysis for less than a full month, per day | Days of care and the reason for the partial month | Units must match days of service. Confirm the age band. |
Dialysis procedures: 90935, 90937 | Hemodialysis with physician evaluation, often inpatient | Order, treatment record, and evaluation note | Check setting and payer rules before reporting alongside monthly services. |
Modifiers: 25, GV, GW, 52 | Separate visits, hospice scenarios, reduced services waiver | Reason the modifier applies, stated in the note | Hospice patients need GV or GW. Modifier 52 for no face to face home dialysis is at MAC discretion. |
These are examples only. Verify current CPT codes, the ICD 10 CM FY 2027 code set effective October 1, 2026, payer policy, and claim context before billing.
Verify → Document → Code → Authorize → Scrub → Submit → Post → Follow up → Report |
1. Eligibility and benefits. Confirm active coverage, payer order, and ESRD status. A group health plan can be primary during the Medicare coordination period.
2. Documentation review. Check that notes, orders, dialysis records, and visit counts support what will be billed.
3. Diagnosis and procedure coding. Assign the CKD stage or ESRD code, then the service code that fits age, setting, and visits.
4. Authorization checks. Confirm whether the payer requires prior authorization for the service.
5. Claim scrubbing. Review modifiers, units, dates, and National Correct Coding Initiative edits before release.
6. Submission and posting. Send clean claims on time, then post payments and adjustments against expected reimbursement.
7. Denial follow up and reporting. Work each denial to its root cause and track denial rate, days in accounts receivable, and clean claim rate.
Seeing the same denials month after month? Our team can review your nephrology billing workflow, recurring denials, or slow reimbursements with you. Call (703) 345 9216 or email operations@carercm.us to request a consultation or revenue cycle review. |
- Monthly visits: The code level depends on how many face to face visits the record supports, so a missing note can lower or invalidate the claim.
- Home dialysis: Medicare expects a monthly face to face visit, and a waiver is available only in limited situations, with a No Face to Face note on the claim.
- Hospice: Claims without GV or GW can deny when the patient is enrolled in hospice.
- Combination coding: Hypertension with CKD, and diabetes with CKD, need the right combination code plus an N18 code for the stage.
- Payer variation: Commercial and Medicare Advantage plans may differ on age bands, authorization, and timing, so check each contract.
- Duplicate monthly claims: Track which physician bills the monthly payment for each patient.
- Billing before month end: Hold monthly claims until the billing month is complete.
- Diagnosis and service mismatch: Run edits that match dialysis codes to ESRD or CKD diagnoses.
- Stale stage coding: Reconfirm the CKD stage at each review rather than copying forward.
- Unworked denials: Assign owners and deadlines to every denial category.
☐ Coverage and payer order verified before the first visit each year
☐ Visit counts for each patient reconciled before monthly claims are coded
☐ Diagnosis codes match the documented CKD stage or ESRD status
☐ Modifier use reviewed for hospice and separate visit scenarios
☐ Denials sorted by cause and reviewed on a set schedule
Nephrology Billing FAQs
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It is the coding, claim submission, and payment follow up for kidney care services, including CKD management, dialysis related physician services, and monthly ESRD capitation.
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Medicare pays one monthly amount per ESRD patient for most dialysis related physician services. The code depends on age, setting, and visit count.
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Services included in the monthly payment are not billed separately. A clearly unrelated and documented service may be reportable, but payer rules and modifier requirements apply.
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Common causes include duplicate monthly claims, early submission, diagnosis mismatches, missing hospice modifiers, and eligibility or payer order errors.
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Consider it when denials repeat, payments slow, or staff cannot keep up with monthly reviews and payer changes.
Strong nephrology billing comes from matching codes to documentation, respecting monthly capitation rules, and working denials to their source. Care RCM would welcome a conversation about your practice.
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Schedule Free ConsultationDisclaimer: Denial rates, performance benchmarks, and revenue improvement figures referenced in this guide reflect publicly available information, industry research, and Care RCM professional RCM experience as of October 2026. Individual practice outcomes vary based on payer mix, specialty volume, existing billing infrastructure, and claim complexity. All CPT code, modifier, and compliance guidance reflects current CMS and AMA standards. Nephrology billing references are intended as general guidance only; specific coding and bundling rules should be verified with a qualified billing specialist for your practice.