5.1 RBRVS and the Medicare Physician Fee Schedule
Key Takeaways
- The Resource-Based Relative Value Scale (RBRVS) sets physician payment using three Relative Value Units (RVUs): Work, Practice Expense, and Malpractice.
- Each RVU is adjusted to local cost by a matching Geographic Practice Cost Index (GPCI) for the payment locality.
- The Medicare Physician Fee Schedule (MPFS) payment formula is: [(Work RVU x Work GPCI) + (PE RVU x PE GPCI) + (MP RVU x MP GPCI)] x Conversion Factor.
- For CY 2026 CMS publishes two conversion factors: $33.5675 for qualifying APM participants and $33.4009 for all other clinicians.
- Practice Expense RVUs are higher in non-facility settings, so an office service often pays more than the same service performed in a hospital.
Why RBRVS Matters for Billers
Most physician and non-facility outpatient claims under Medicare Part B are paid from the Medicare Physician Fee Schedule (MPFS), built on the Resource-Based Relative Value Scale (RBRVS). As a Certified Professional Biller (CPB), you will not build a fee schedule from scratch, but you must verify that a posted allowed amount is correct, explain an underpayment, and recognize when a line paid at a facility rate instead of a non-facility rate. RBRVS replaced the old "usual, customary, and reasonable" charge system in 1992 precisely to make payment predictable and resource-based rather than charge-based.
The Three RVU Components
Every CPT/HCPCS service on the MPFS carries three Relative Value Units (RVUs). RVUs are unitless measures of relative resource cost — a number, not a dollar amount.
| RVU Component | What It Measures | Example Driver |
|---|---|---|
| Work RVU (wRVU) | Physician time, skill, mental effort, stress | A complex surgery has a far higher wRVU than 99213 |
| Practice Expense RVU (peRVU) | Clinical/administrative staff, supplies, equipment, rent | In-office services carry more practice-expense cost than facility services |
| Malpractice RVU (mpRVU) | Professional liability insurance cost | High-risk specialties (OB, neurosurgery) carry larger MP RVUs |
The work RVU is the largest component for most surgical and cognitive services; practice expense dominates for in-office diagnostics like an EKG or a nebulizer treatment.
Geographic Adjustment with GPCIs
Costs differ by region, so CMS assigns each payment locality three Geographic Practice Cost Indices (GPCIs) — one per RVU component. A GPCI above 1.00 means the locality costs more than the national average; below 1.00 means less. Manhattan's work GPCI exceeds 1.00; a rural locality's may be 0.90. The same CPT code therefore pays a different allowed amount in San Francisco than in rural Mississippi even though the RVUs are national.
The MPFS Payment Formula
Payment adjusts each RVU by its GPCI, sums the results, then multiplies by the annual Conversion Factor (CF):
Payment = [(Work RVU x Work GPCI) + (PE RVU x PE GPCI) + (MP RVU x MP GPCI)] x CF
Worked Example (CY 2026 values)
Assume a service with wRVU 2.00, peRVU 1.50, mpRVU 0.20, locality GPCIs of 1.00/1.05/0.95, and the CY 2026 non-QP conversion factor of $33.4009.
- Work: 2.00 x 1.00 = 2.000
- PE: 1.50 x 1.05 = 1.575
- MP: 0.20 x 0.95 = 0.190
- Total adjusted RVUs = 3.765
- Payment = 3.765 x $33.4009 = $125.75
For CY 2026 CMS finalized two conversion factors: $33.5675 for clinicians who are qualifying participants in Advanced APMs and $33.4009 for everyone else. Always pull current figures from the CMS-published MPFS file rather than memorizing a dollar amount — the CF changes every January 1. On the exam, the formula and the order of operations matter more than the exact dollar value: GPCI-adjust each RVU first, sum, then multiply by the CF. A common distractor multiplies raw RVUs by the CF without applying GPCIs, which overstates payment in high-cost localities and understates it in low-cost ones.
Reading the Allowed Amount
The figure the formula produces is the Medicare allowed amount, not what the practice receives. Medicare pays 80% of the allowed amount; the patient (or a secondary payer) owes the remaining 20% coinsurance after the Part B deductible is met. If a non-participating provider does not accept assignment, payment is capped at the limiting charge of 115% of the reduced non-par fee schedule. A biller validating a remittance confirms that the allowed amount matches the fee schedule and that the 80/20 split is correct before chasing a balance from the patient.
Site-of-Service Differential
Many services carry two PE RVU values: a non-facility (office) rate and a lower facility (hospital, ASC) rate. In a facility the hospital separately bills its overhead, so CMS pays the physician the lower facility PE RVU to avoid paying twice. The Place of Service (POS) code on the CMS-1500 drives which rate applies. POS 11 (office) triggers the higher non-facility rate; POS 21 (inpatient hospital) or 22 (on-campus outpatient) triggers the facility rate. A wrong POS code is a top cause of MPFS over- and under-payments.
Budget Neutrality
By law, RVU changes that would raise total spending by more than $20 million must be offset. To stay revenue-neutral, CMS adjusts the conversion factor so the overall schedule stays within budget. This is why the CF can fall even when individual RVUs rise — the classic trap billers see in year-over-year payment shifts. For CY 2026, statutory updates (including a 2.5% update from the One Big Beautiful Bill Act) plus a 2.5% efficiency adjustment on most non-time-based codes net out to a modest CF increase over 2025. Time-based codes, telehealth-list codes, and maternity codes were excluded from the efficiency cut.
Quick Reference: Common Biller Validation Steps
- Confirm the locality and POS before disputing an amount — most "underpayments" are correct facility-rate payments.
- Match the CF tier — a QP-in-APM clinician is paid at the higher $33.5675 factor.
- Re-derive the math for a sample line each January when the new fee schedule loads, to catch posting-software errors early.
- Watch global periods — an E/M billed inside a 90-day global without modifier 24 will deny even though the math is right.
A practice performs a procedure in its own office (POS 11). The same CPT code is also performed at a hospital outpatient department (POS 22). Which statement about MPFS payment is correct?
A service has total geographically adjusted RVUs of 4.00 and is billed by a clinician paid at the CY 2026 non-QP conversion factor of $33.4009. What is the approximate allowed amount?
Medicare's allowed amount for a service is $200 and the patient has met the Part B deductible. Assuming an assigned, participating provider, how much does Medicare pay and how much is patient coinsurance?