Nephrology billing
Almost every other specialty bills an encounter. Nephrology bills a calendar month. The monthly capitation payment covers nearly all outpatient ESRD-related physician work for a dialysis patient across the whole month, and the code reported depends less on what was done than on how many times somebody sat down with the patient face to face -- one visit, two to three, or four or more -- with age at the end of the month deciding the rest.
- The monthly capitation payment covers a calendar month of ESRD-related care, not a visit
- Centre-based patients are banded by face-to-face visit count; home dialysis patients by age alone
- A partial month falls to a per-day code, but only in a closed list of circumstances
- The facility side is paid per treatment, with three payments a week and a modifier that attests when a treatment does not qualify
This is an educational guide to how billing works for nephrology — its workflow, coding, and payer considerations. It is general information, not a statement that US Medical Billing serves this specialty, and not billing, coding, or legal advice.
What makes nephrology billing distinct
The Medicare Claims Processing Manual states that physicians and practitioners managing patients on dialysis are paid a monthly capitation payment for most outpatient dialysis-related physician services furnished to a Medicare end stage renal disease beneficiary, and that the payment amount varies based on the number of visits provided within each month and the age of the beneficiary. Separate codes are billed for one visit per month, for two to three visits, and for four or more. The lowest amount applies at one visit; the highest requires at least four ESRD-related visits in the month. The service is reported once per month.
That is a payment shape almost nothing else in physician billing uses. The regulation behind it, 42 CFR 414.314, describes the method as paying an amount for each patient to cover all professional services furnished by the physician except a listed few, and makes payment of the capitation amount for any particular month contingent on the physician furnishing all the physician services the patient required during that month. The claim is therefore not a record of an encounter. It is a statement about a period, and the visit count is the variable that prices it.
The word capitation is doing unfamiliar work here. This is not managed-care capitation: there is a claim, it carries dates of service spanning the calendar month, it is submitted after the month has passed, and it is priced by what happened inside the month. Managed-care capitation is a fixed per-member payment made whether or not the member is seen at all. The two share a word and almost nothing else, and a posting process built for one will mishandle the other.
Home dialysis inverts the rule. The manual states that physicians and practitioners managing ESRD patients who dialyze at home are paid a single monthly rate based on the age of the beneficiary, regardless of the number of face-to-face visits -- though at least one face-to-face visit per month is required and should be supported by the documentation, a requirement contractors may waive case by case where the notes show the physician actively and adequately managed the patient through the month. A patient who moves between home and centre in the same month is billed with the home dialysis full-month code either way, regardless of the proportion of the month spent in each.
Below the physician claim sits a facility claim with a different shape again. The facility is paid a per-treatment amount under the ESRD prospective payment system, and the manual states the policy allows three payments per week -- so a thirty-day month is limited to thirteen treatments and a thirty-one-day month to fourteen, with exceptions for medical justification. Treatments beyond that must be justified to the contractor, and where they cannot be, the claim line carries the CG modifier, by which the facility attests that the additional treatment does not meet the medical justification requirement. It is a modifier whose whole purpose is to say the service does not qualify.
How nephrology billing flows
The cycle is anchored to the calendar rather than to appointments: the month opens, accumulates visits, and is priced once it closes.
Establishing who owns the month
One physician or practitioner bills the monthly service -- the one who furnishes the complete assessment, establishes the plan of care and provides the ongoing management. Only one monthly payment is made for a patient in a month, so that ownership has to be settled rather than assumed.
Common operational challenges
The recurring difficulties come from a claim that cannot be built at the point of care, because the fact that prices it is not complete until the month is.
The billable fact accrues over thirty days
Nothing about a single dialysis visit tells you what to bill. The code is chosen from a count that only exists once the month has closed, which means visit capture has to be complete and attributable across the whole period, not accurate per encounter.
Visits happen where the billing system is not
Face-to-face ESRD visits occur in dialysis facilities, at the bedside in observation, and in skilled nursing facilities. Those encounters have to reach the count, and each carries a countable-or-not determination that the clinical record alone does not make.
One month, one physician, several practices
Partners and employed practitioners may furnish visits toward the month, but the physician who performed the complete assessment bills it. Group structure, employment relationship and who assessed the patient all bear on a single claim.
Two claims describing the same treatments
The facility bills per treatment against a weekly limit while the physician bills the month. They answer to different rules and different edits, and a reconciliation that treats them as one revenue stream will not explain either.
Documentation and coding considerations
The notes below describe reporting and documentation considerations from the Medicare manuals and regulation; they do not reproduce any code descriptions.
The band is a visit count, not an intensity judgement
For centre-based patients, separate codes exist for one visit per month, two to three visits, and four or more. The manual is explicit that the highest amount requires at least four ESRD-related visits in the month. The selection is arithmetic on a countable event, which makes the count itself the documentation that matters.
Age is taken at the end of the month
The manual states that the beneficiary's age at the end of the month is the age used to select the appropriate age-related ESRD-related services code. A patient whose birthday falls mid-month is billed on the age they finished the month at.
What the month means, and where it starts
Month means a calendar month. In the first month, the period runs from the date dialysis treatments begin through the end of that calendar month; after that it is the calendar month itself. The claim's dates of service state the period the physician was responsible for the patient's ESRD-related care.
The per-day codes are not a fallback for a weak month
Per-day ESRD-related services codes apply to a closed list: home dialysis for less than a full month, transient patients travelling away from home, certain partial months, and a permanent change of managing physician. The manual states plainly that they may not be used for a full month when a complete monthly assessment is not furnished.
A modifier that attests the service does not qualify
On the facility side, treatments beyond the weekly limit need medical justification. Where the justification is not met, the additional treatment is reported with the CG modifier, by which the facility attests exactly that -- and the line is not paid. The modifier exists to make a non-qualifying treatment reportable, not payable.
Denial and rejection risks
Because one claim carries a whole month, an error here is rarely a single lost encounter.
A second monthly claim for the same patient and month
Contractors are instructed to assure that only one monthly payment is made for a renal disease patient per month. Where two physicians each believe they own the month, one claim is going to be rejected and the correct response is an attribution decision, not a resubmission.
A band the visit count does not support
Reporting the four-or-more code on a month with three countable visits misstates the variable the payment is built on. Because the count includes and excludes visits by setting, the disagreement is often between two defensible records rather than an obvious error.
Inpatient visits counted toward the month
Inpatient visits are not counted for the monthly service; the appropriate inpatient visit code is billed instead. Observation and skilled-nursing-facility visits are counted. Getting the setting wrong moves the claim into the wrong band.
A monthly service billed with no complete assessment
The complete assessment, the plan of care and the ongoing management are what the monthly payment is for. A month of face-to-face visits without one does not qualify -- and does not convert into per-day units either.
Excluded services folded into the month
The manual lists services outside the monthly payment, including hepatitis B vaccine administration, dialysis access surgery, the complete transplant evaluation, home dialysis training, inpatient physician services and genuinely unrelated care. Billing them separately is correct; assuming the month covers them loses the revenue silently.
Payer-process considerations
ESRD has its own eligibility route into Medicare and its own payment machinery, and the two interact.
Cost sharing still attaches to the month
Payment for ESRD-related services is made at eighty percent of the Medicare approved amount after the Part B deductible is met, with the beneficiary responsible for the deductible and the coinsurance. A monthly unit does not change who owes the balance -- it changes how large a single patient balance can be.
Assignment decides who is paid
The regulation provides that the capitation amount is paid to the physician where assignment is accepted, and to the beneficiary where it is not. That is a decision made once at enrolment and felt every month.
The claim identifies the facility, not only the physician
The manual's claim instructions require the name, address and identifier of the facility involved in the patient's maintenance care or training, and require the record to indicate whether the patient is in training for self-dialysis. The physician claim carries facts about a place it was not furnished in.
Commercial plans and Medicare Advantage set their own terms
The structure described here is Original Medicare. Commercial payers and Medicare Advantage plans may pay ESRD physician management differently, and coordination with an employer plan is a live question in nephrology in a way it is not in most specialties.
Revenue-cycle checkpoints
The first three exist because the claim cannot be assembled from any single encounter.
- Decide and record, per patient per month, which physician or practitioner owns the monthly service
- Capture every face-to-face ESRD visit with its setting, so countable and non-countable visits can be separated later
- Hold the claim until the calendar month closes, then select the band from the completed count
- Take the beneficiary's age at the end of the month, not at the first visit
- Bill the home dialysis full-month code where the patient used both home and centre dialysis in the month
- Confirm a complete monthly assessment and plan of care exist before reporting a monthly service
- Use per-day codes only for the circumstances the manual lists, and split spans that cross a month boundary onto separate monthly claims
- Keep the excluded services -- access surgery, transplant evaluation, home training, unrelated care -- off the monthly claim and on their own
Related & connected
Services, tools, background reading and definitions that connect to the nephrology revenue-cycle steps above.
Related services
- Claims managementBuilding and dating a claim that describes a period rather than an encounter.
- Coding supportSelecting the band from a visit count, and keeping excluded services off the monthly claim.
- Payment postingPosting a monthly payment against a month of care, which is not how a claim remittance usually reconciles.
Calculators & tools
- CMS claim form field referenceThe CMS-1500 elements the monthly claim completes differently -- dates of service, facility, and the training indicator.
- Medicare claim readiness checklistWhat has to be true before a Medicare professional claim is released.
- HCPCS code lookupThe Level II code set, and the modifiers a dialysis facility claim may carry.
From the Knowledge Base
- Posting capitation paymentsManaged-care capitation -- the other thing called capitation, and why a process built for it will mishandle this one.
- Incident-to and split/shared billingThe rules the manual points to when visits toward the month are furnished by someone other than the managing physician.
- Medicare fee schedules explainedHow the amounts behind these codes are set, since the monthly service is a fee schedule payment.
- Medicare Part B billingThe professional-claim framework the monthly service is reported inside.
Glossary
- Bundled paymentOne payment covering a defined set of services -- the shape both the monthly service and the facility's per-treatment rate take.
- HCPCS Level IIThe code set that carries the modifiers a dialysis facility claim uses.
- CMS-1500The professional claim form whose date and facility elements the monthly service completes its own way.
- ModifierThe two-character code that here can attest a treatment does not meet the justification requirement.
Frequently asked questions
What is the monthly capitation payment in nephrology?
It is the way Medicare pays a physician or practitioner for managing an outpatient dialysis patient across a calendar month. The Claims Processing Manual states that those managing centre-based patients are paid a monthly rate for most outpatient dialysis-related physician services, and that the amount varies with the number of visits provided within the month and the beneficiary's age. Separate codes exist for one visit per month, two to three visits, and four or more, and the service is reported once per month. 42 CFR 414.314 describes the method as covering all professional services furnished by the physician except a listed set, with payment for a given month contingent on the physician furnishing the services the patient required during it.
Is this the same as the capitation a managed care plan pays?
No, and treating them alike causes real errors. Managed-care capitation is a fixed periodic payment for an enrolled member, paid whether or not the member receives any services, and it reconciles to a roster rather than to charges. The ESRD monthly capitation payment is billed on a claim, carries dates of service covering the calendar month, is submitted after the month has ended, and is priced by what happened during it -- specifically by how many face-to-face visits were furnished. They share a word.
Which visits count toward the monthly band?
The manual requires visits to be furnished face to face by a physician, clinical nurse specialist, nurse practitioner or physician assistant. ESRD-related visits furnished to patients in hospital observation status count, as do visits to beneficiaries residing in a skilled nursing facility. Inpatient visits do not count toward the monthly service; the appropriate inpatient visit code is billed instead. Visits by residents, interns and fellows in an approved graduate medical education programme may count where the teaching physician was present. Partners and employed practitioners may furnish some of the visits, but the physician who provides the complete assessment, establishes the plan of care and provides the ongoing management is the one who bills.
What happens when the patient is only managed for part of a month?
It depends on whether a complete monthly assessment was furnished. The manual directs that for partial months arising from hospitalization, kidney transplant or the patient's death, a physician who furnished a complete monthly assessment bills the monthly service reflecting the number of visits furnished. Where the month cannot support that -- home dialysis for less than a full month, a transient patient travelling away from home, a partial month where visits occurred but no complete assessment was furnished before the break, or a permanent change of managing physician -- per-day ESRD-related services codes are used for the days the physician was responsible. Those per-day codes may not be used for a full month simply because no complete assessment was done.
How does home dialysis change the payment?
It removes the visit count from the calculation. The manual states that physicians and practitioners managing ESRD patients who dialyze at home are paid a single monthly rate based on the age of the beneficiary, regardless of the number of face-to-face visits, while still requiring at least one face-to-face visit in the month, supported by documentation -- a requirement contractors may waive case by case where the notes show the patient was actively and adequately managed throughout. If a home dialysis patient receives dialysis at a centre during the month, the home dialysis full-month code is still the one billed, regardless of the proportion of the month spent under each modality.
Sources
Last reviewed July 31, 2026.
- Centers for Medicare & Medicaid Services (CMS)Medicare Claims Processing Manual (Pub. 100-04), Chapter 8 §140 and subsections -- the monthly capitation payment, the banding by number of visits and by age, the services included in and excluded from it, the definition of month and the age-at-month-end rule, qualifying visits by setting and by practitioner, home dialysis paid at a single age-based rate, patients who switch modalities, the per-day codes and the closed list of circumstances they apply to, the claim data elements, and the one-payment-per-patient-per-month control. Section 10.1 for the facility per-treatment payment, the three-per-week limit and the CG modifier attestation
- Office of the Federal Register / eCFR42 CFR 414.314 Monthly capitation payment method -- the basic rules, the requirement that the month's payment is contingent on furnishing the services the patient required, payment on assignment, the services excluded from the MCP, and proportional reduction where the physician or patient is unavailable
Ready to improve your revenue cycle?
Tell us about your practice and we’ll tell you where we would start.