CPT 33533, coronary artery bypass grafting using a single arterial graft, carries a work RVU of 32.91, a practice expense RVU of 11.59, and a malpractice RVU of 8.13 under 2026 CMS relative value data, for a non-facility total RVU of 52.63. Those three numbers drive two very different things — the Medicare payment a practice actually collects for the service, and the wRVU credit a surgeon might see on a compensation statement — and conflating the two is one of the most common mistakes in cardiac surgery productivity analysis.
What the 32.91 Work RVU Actually Measures
Work RVU is CMS’s estimate of physician effort, skill, time, and stress associated with performing a service, relative to other services in the fee schedule. For a bypass procedure of this complexity, 32.91 wRVU reflects the technical difficulty and intensity of harvesting and anastomosing an arterial conduit, not the total resources needed to deliver the service. Two other components complete the picture:
| RVU Component | 2026 Value | What It Represents |
|---|---|---|
| Work RVU | 32.91 | Physician time, technical skill, and intensity |
| Practice Expense (PE) RVU | 11.59 | Non-physician clinical staff, supplies, and facility overhead |
| Malpractice (MP) RVU | 8.13 | Professional liability insurance cost allocated to the service |
| Total RVU (non-facility) | 52.63 | Full resource basis for Medicare payment |
The malpractice component of 8.13 is unusually large for CPT 33533 compared to office-based or diagnostic services, which typically carry MP RVU values under 1.0. This reflects the elevated liability risk CMS associates with open-heart surgery, and it means locality-level malpractice cost differences have a real, measurable effect on the final payment for this code — more so than for most CPT codes a cardiology or cardiac surgery practice bills.
From RVU to Medicare Payment
Medicare does not pay a flat dollar amount per RVU. Each of the three components is adjusted separately by a Geographic Practice Cost Index (GPCI) value specific to the physician’s payment locality, and only after that adjustment is the sum multiplied by the annual conversion factor (CF):
Medicare Payment = ((Work RVU × Work GPCI) + (PE RVU × PE GPCI) + (MP RVU × MP GPCI)) × Conversion Factor
Applied to CPT 33533, before any locality adjustment:
(32.91 × 1.0) + (11.59 × 1.0) + (8.13 × 1.0) = 52.63 total RVU
A notable change took effect for 2026: CMS now uses two separate conversion factors under statute, rather than a single national CF as in prior years. The finalized CY 2026 conversion factor is $33.57 for clinicians who qualify as Advanced Alternative Payment Model (APM) participants, and $33.40 for everyone else. Using the non-qualifying-APM CF against the unadjusted total RVU of 52.63:
52.63 × $33.40 ≈ $1,757.89
That $1,757.89 is a national, GPCI-neutral estimate — it does not reflect any specific locality, and it is not the amount a particular practice will see on a remittance advice. Actual payment moves up or down once locality-specific Work GPCI, PE GPCI, and MP GPCI values are applied to each component separately, which is why two hospitals billing the identical code can be reimbursed differently even in the same calendar year. Running this calculation for a specific ZIP code or Medicare locality is faster with the RVU calculator, and comparing how the same CPT 33533 payment shifts across regions works best with the GPCI calculator.
It’s also worth noting that facility-setting payment differs from non-facility payment for many CPT codes because PE RVU is split into facility and non-facility values — for a procedure like 33533 that is almost always performed in a hospital operating room, the facility PE RVU applies, and practices should confirm which PE value the CMS Physician Fee Schedule Look-Up Tool assigns for the specific place of service before finalizing a payment estimate.
Why wRVU Compensation Is Not the Same as This Payment Figure
This is where CABG RVU searches most often go wrong. The $1,757.89 figure above is a Medicare reimbursement estimate — money the practice or hospital collects from CMS for the professional service. It has no fixed, direct relationship to what a surgeon is paid personally under a wRVU-based compensation plan.
| Concept | Basis | Who Sets It | What It Answers |
|---|---|---|---|
| Medicare payment RVU | All three RVU components + GPCI + CF | CMS, updated annually | What Medicare reimburses for the service |
| wRVU compensation | Work RVU only, times a negotiated dollar rate | Employer or group compensation plan | What the physician is credited/paid personally |
| Total RVU | Work + PE + MP RVU | CMS | Full resource basis, used for payment, not compensation |
Most physician compensation plans use only the 32.91 work RVU figure, multiplied by a negotiated compensation-per-wRVU rate that has nothing to do with the Medicare conversion factor. A cardiac surgery group might pay, for example, $75 per wRVU as an illustrative internal rate — a number set by market benchmarking and group economics, not by CMS:
32.91 wRVU × $75/wRVU (illustrative compensation rate) = $2,468.25 in wRVU credit
That figure is unrelated to the $1,757.89 Medicare payment estimate calculated above; one uses work RVU alone against a privately negotiated rate, the other uses total RVU against CMS’s GPCI and conversion factor. Confusing the two leads to compensation modeling errors, especially for high-wRVU procedures like CABG where the gap between the two numbers is largest. The wRVU calculator is built specifically to isolate the compensation-side math from the Medicare payment-side math so the two don’t get blended.
Comparing CPT 33533 Against Adjacent Cardiovascular Services
A CABG RVU lookup is rarely done in isolation — it’s usually part of comparing operative work against diagnostic and consultative cardiovascular services in a broader productivity or contract review.
| CPT Code | Service | Work RVU | PE RVU | MP RVU | Total RVU |
|---|---|---|---|---|---|
| 33533 | CABG, single arterial graft | 32.91 | 11.59 | 8.13 | 52.63 |
| 93306 | Transthoracic echocardiogram, complete, with Doppler | 1.42 | 4.39 | 0.08 | 5.89 |
| 93015 | Cardiovascular stress test, supervision and interpretation | 0.73 | 1.43 | 0.04 | 2.20 |
The gap is stark: a single CABG case generates roughly 23 times the work RVU of a complete echocardiogram. That comparison is useful for understanding relative operative intensity, but it says nothing about which role — cardiac surgery, interventional cardiology, or general cardiology — has a fairer or more achievable annual compensation target. A surgeon doing 150 CABG cases a year and a cardiologist reading 3,000 echoes a year can land on comparable total wRVU output through entirely different service mixes, call burdens, and referral structures. When comparing multiple codes this way, keep the RVU year and locality assumptions identical across every code in the comparison, since CMS updates work RVU values annually and applying a 2026 value for one code against a 2024 value for another will distort the comparison.
What the RVU Figures Cannot Tell You
The 32.91 work RVU value assumes CPT 33533 is already the correct code — that graft count, any add-on codes for additional grafts, reoperation status, and assistant-at-surgery billing have already been determined through documentation and CPT coding guidelines. RVU data describes the payment and productivity consequence of a coding decision; it does not make the coding decision. If there’s any question about whether a case involved multiple arterial grafts, a combination of arterial and venous grafts, or a reoperative approach, that has to be resolved through operative note review and CPT code selection rules before the RVU and payment figures in this guide apply.
Similarly, a high wRVU value attached to CPT 33533 does not by itself validate a compensation target in a physician contract. Evaluating whether an annual wRVU threshold is realistic requires translating it into an expected case count, then checking that against:
- Surgical volume and referral pipeline for the specific program or facility
- Call coverage obligations and how call-generated cases are credited
- Whether global-period follow-up visits, modifier-driven services, and assistant-surgeon work are counted toward the wRVU total in writing
- Program maturity — a ramp-up role at a new cardiac surgery program carries very different volume risk than an established service line
These questions sit outside RVU data entirely and are better addressed with a contract red flags review alongside specialty-specific cardiology wRVU benchmarks for context on typical annual output in comparable roles.
Putting the Numbers to Work
For a Medicare payment estimate specific to a practice’s locality, start with the total RVU of 52.63, apply locality Work, PE, and MP GPCI values through the GPCI calculator, and multiply by the applicable 2026 conversion factor — $33.40 for most non-QP clinicians or $33.57 for qualifying APM participants. For a compensation-side estimate, use the 32.91 work RVU figure alone against the group’s negotiated per-wRVU rate through the wRVU calculator, keeping that calculation entirely separate from the Medicare payment math above. Running both calculations side by side, rather than treating one number as a stand-in for the other, is what prevents the most common CABG RVU misinterpretation: assuming a big work RVU number and a big Medicare payment number are the same thing.