Reviewed by Roey Hine
Key Takeaways
- The ESRD Monthly Capitation Payment (MCP) is a single monthly code, not a per-visit fee, and code selection depends on the patient’s age and the number of face-to-face visits completed that month.
- Only one MCP claim is allowed per patient per month, and the billing physician must personally provide at least one of the required face-to-face visits.
- A patient who starts, stops, transfers, or is hospitalized mid-month is billed with per-diem codes 90967–90970, not a full-month MCP code.
- Dialysis session codes (90935–90947) and MCP codes (90951–90962) cannot both be billed for the same patient in the same month.
- CKD stage must be reflected with ICD-10 specificity (N18.1–N18.6), and hypertension-related kidney disease requires a combination code rather than two separate diagnoses.
Nephrology billing runs on a different model than most physician specialties. Instead of billing each office visit separately, Medicare pays nephrologists a single Monthly Capitation Payment for a full month of managing a dialysis patient’s care. That model creates errors that don’t show up in fee-for-service specialties at all: wrong code tier, incomplete visit documentation, incorrect partial-month billing. This post covers the rules that most commonly trip up nephrology billing teams.
The ESRD Monthly Capitation Payment (MCP), Explained
The Monthly Capitation Payment is a single code Medicare pays once per calendar month to cover a physician’s routine management of a dialysis patient, rather than billing each visit individually. It applies to patients with end-stage renal disease (ESRD) receiving in-facility or home dialysis, and it covers dialysis supervision, patient examinations, care coordination, and documentation review for that month.
MCP replaces standard E/M billing for routine dialysis-related care. A nephrologist cannot bill a monthly MCP code and also bill separate E/M visits for the same routine dialysis management in that month. The MCP code already includes it.
MCP Code Selection by Age and Visit Count
MCP code selection for in-facility dialysis depends on two factors: the patient’s age at the end of the month, and the number of face-to-face physician or qualified practitioner visits completed that month. Medicare recognizes four age bands, each with three visit-count tiers, for a total of twelve distinct codes covering CPT range 90951–90962.
| Age Group | 1 Visit | 2–3 Visits | 4+ Visits |
| Younger than 2 years | 90951 | 90952 | 90953 |
| 2–11 years | 90954 | 90955 | 90956 |
| 12–19 years | 90957 | 90958 | 90959 |
| 20 years and older | 90960 | 90961 | 90962 |
At least one visit each month must include a clinical examination of the vascular access site. Home dialysis patients are billed under a separate but parallel code range (90963–90966), also tiered by age, and Medicare pays the same monthly amount regardless of whether the patient dialyzes at home or in a facility.
Partial-Month Dialysis Billing Rules
When a patient doesn’t receive dialysis management for the entire calendar month, Medicare requires per-diem codes 90967–90970 instead of a full-month MCP code. The appropriate code is still selected by the patient’s age, but billed per day rather than per month, with units equal to the number of days the physician managed the patient’s care.
Common triggers for partial-month billing include:
- The patient starts or stops dialysis partway through the month
- The patient transfers to a different facility or a different physician’s care
- A hospital admission interrupts the outpatient management period
- The patient receives a transplant or dies during the month
In our work with nephrology practices, partial-month scenarios are one of the most common places MCP billing goes wrong, not because the code choice is unclear, but because practices default to the full-month code out of habit instead of checking the calendar against the visit log.
A claim scrubber built to flag date-of-service mismatches against visit documentation, like PGM’s AI Claim Scrubber, catches this pattern before submission by comparing the billed date range against documented visit dates.
Billing an E/M Visit Separately From MCP Services
A nephrologist can bill a separate E/M visit only when the visit addresses a condition unrelated to the patient’s dialysis or ESRD management. Routine dialysis evaluation, treatment supervision, and standard patient management are already included in the MCP code and cannot be billed again as a separate E/M visit.
A separately billable E/M visit requires modifier 25, documentation that clearly identifies the unrelated condition, and a note that stands apart from the routine dialysis management documentation. An example is a dialysis patient seen for an acute infection or uncontrolled hypertension unrelated to routine ESRD care. That visit can be billed with modifier 25 appended to the E/M code.
Why Can’t Dialysis Session Codes and MCP Codes Be Billed in the Same Month?
Dialysis session codes (90935–90947) and MCP codes (90951–90962) represent two different billing models for the same underlying care, and Medicare does not allow both for the same patient in the same month. Session codes bill for individual dialysis encounters one at a time; MCP codes bill once for the full month of management. A practice has to pick one model per patient per month, not mix them.
This distinction also matters for hospital-based hemodialysis, which uses its own session-based codes (90935 for a single physician evaluation of one dialysis session, 90937 when the physician’s evaluation requires repeated assessments during that same session). That’s a different code family from the outpatient MCP structure entirely.
CKD Stage and Its Effect on Nephrology Coding and Reimbursement
Chronic kidney disease must be coded to the specific stage documented in the chart, using ICD-10 codes N18.1 through N18.6, because payers evaluate whether the diagnosis code supports the level of management being billed. A nonspecific or unstaged CKD code is a common source of denials and documentation requests.
Two related coding rules also affect nephrology claims. Hypertension-related kidney disease requires a combination code (the I12.- series) rather than reporting hypertension and CKD as two separate diagnoses. And once a patient reaches ESRD requiring dialysis, the diagnosis coding should include dialysis-status code Z99.2 alongside the CKD stage to support ongoing nephrology services and monitoring. The ICD-10 Codes for Nephrology guide covers the full set of commonly used diagnosis codes and documentation considerations for kidney care.
MCP billing has more moving parts than a typical fee-for-service specialty, and the errors tend to hide in places a standard claim scrubber isn’t built to look: visit counts, date ranges, and code-model mixing, rather than missing modifiers. PGM has supported nephrology practices for more than 45 years, and our billing team builds workflows around how ESRD management actually gets billed, not a generic fee-for-service template. If your practice wants a closer look at where MCP billing may be leaving revenue on the table or creating audit risk, learn about our nephrology billing services and how PGM supports kidney care providers nationwide. Then contact PGM to schedule a review of your nephrology revenue cycle.
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Frequently Asked Questions About Nephrology Billing
Does the ESRD MCP amount differ between home dialysis and in-facility dialysis?
No. Medicare pays the same monthly amount for a given patient regardless of whether the dialysis is performed at home or in an approved outpatient facility. The code range differs (90951–90962 for in-facility, 90963–90966 for home), but the payment level is not affected by setting.
Who submits the MCP claim when more than one physician shares a patient’s dialysis care?
The physician who performs the complete monthly assessment, establishes the plan of care, and provides at least one of the required face-to-face visits is the one who bills the MCP. Only one MCP claim is allowed per patient per month, even when multiple physicians in the practice contribute visits during that month.
Is a vascular access exam required every month for MCP billing?
Yes. At least one of the required face-to-face visits each month must include a clinical examination of the vascular access site, performed by a physician, clinical nurse specialist, nurse practitioner, or physician assistant. Documentation must support that this exam occurred.
Is dialysis provided during a hospital inpatient stay billed under MCP?
No. Inpatient dialysis is covered under Medicare Part A and billed according to hospital payment rules, separate from the physician MCP structure, which applies to outpatient and home dialysis management.
Why does hypertension require a combination code with CKD instead of two separate diagnosis codes?
ICD-10-CM classifies hypertensive chronic kidney disease as a single clinical relationship rather than two independent conditions, so coding guidelines require the combination code series (I12.-) instead of reporting hypertension and CKD separately. Reporting them as unrelated diagnoses does not accurately reflect the documented relationship and can affect both compliance and risk adjustment.