CPT code 33771: TGA repair, with surgical VSD enlargement2026 Medicare rate & RVUs in Massachusetts
Open repair of transposition of the great arteries with surgical enlargement of a ventricular septal defect when enlargement is part of the repair.
CMS doesn’t publish an office rate for 33771 in Massachusetts.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
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What 33771 covers
This operation repairs transposition of the great arteries in a patient who also has a ventricular septal defect, with the surgeon surgically enlarging the defect as part of the repair. It is performed by a congenital cardiac surgeon, typically in an operating room with cardiopulmonary bypass, for congenital heart disease requiring this repair strategy. The operative report should identify the transposition and VSD and describe the enlargement performed during the repair.
Report this code when surgical enlargement of the VSD is performed as part of the transposition repair; use 33770 when the repair does not include that enlargement. CMS assigns a 90-day global period, including the day-before preoperative visit and 90 days of related postoperative care. For multiple procedures in one session, the highest-valued procedure is paid in full and other procedures are subject to the standard 50% reduction. Modifier 50 is inappropriate. An assistant at surgery may be paid; co-surgeon payment requires supporting documentation, and team surgery is not permitted.
This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.
Where 33771 pays more and less in Massachusetts
| Payment locality | Office | Facility |
|---|---|---|
| Metropolitan Boston, MA | Unavailable | $2,089.48 |
| Rest of Massachusetts | Unavailable | $1,976.34 |
How the 33771 rate is calculated
Each of 33771’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.
How the rate is built · 33771
RVUs × geographic indexes × conversion factor
Work39.61
39.61 RVUs× 1.000 GPCI
Practice expense10.39
10.39 RVUs× 1.000 GPCI
Malpractice10.02
10.02 RVUs× 1.000 GPCI
Adjusted RVUs
60.0200
Conversion factor
$33.4009
Medicare rate
$2,004.72
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 33771
33771 has a 90-day global period: related visits in that window are included in the surgery payment.
CMS payment indicators · 33771
TGA repair, with surgical VSD enlargement
| Rule | CMS value | What it means |
|---|---|---|
| Global period | 090 | Major surgery: the day before, the day of, and 90 days after are included. |
| Multiple procedures | 2 | Standard reduction: highest-valued procedure at 100%, others at 50%. |
| Bilateral (modifier 50) | 0 | The 150% bilateral adjustment doesn’t apply. |
| Assistant at surgery (80/81/82/AS) | 2 | Paid. |
| Co-surgeons (62) | 1 | Permitted with supporting documentation. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 0 | Physician service: no professional/technical split. |
| Split (54/55/56) | 0.09/0.84/0.07 | Share of the payment for pre-op, the procedure itself, and post-op care. |
Global surgery period · 33771
TGA repair, with surgical VSD enlargement
90-day global period ends
Dec 30, 2026
Covers Sep 30, 2026 through Dec 30, 2026 (92 days, including the day before surgery).
Visit on Oct 31, 2026
Day 30 of the 90-day post-op period: related follow-up care is included in the surgical payment.
Pre-op dayGlobal period
What modifiers do to the payment
Modifier 51 · payment effect
With and without the modifier
33771 without 51 · national facility
$2,004.72
TGA repair, with surgical VSD enlargement
33771-51 · Second procedure: 50%
$1,002.36
When this isn’t the highest-valued procedure in the session, Medicare pays 50% of its fee schedule amount (the highest is paid at 100%).
33771 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 33770TGA repairVSD not enlarged
- Choose 33771 when surgical enlargement of the VSD is part of the transposition repair. Choose 33770 when the repair is performed without that enlargement.
- 33774Atrial baffle repairTransposition of great arteries
- 33774 describes transposition repair using an atrial baffle procedure. It is not the code for a repair that includes surgical VSD enlargement.
- 33782Nikaidoh repairWithout coronary ostia reimplantation
- 33782 identifies a Nikaidoh procedure. Use 33771 when the documented operation is transposition repair with surgical VSD enlargement rather than that distinct approach.
33771 billing questions
How does 33771 differ from 33770?
33771 is for transposition repair that includes surgical enlargement of the VSD. Use 33770 for the corresponding repair without that enlargement.
Should the VSD enlargement be reported separately?
The enlargement is part of the repair represented by 33771. The operative report should make clear that it was performed as part of the transposition repair.
What documentation supports 33771?
Document the transposition, the VSD, and the surgical enlargement performed during the repair. The operative report should distinguish this work from a repair without VSD enlargement.
Can an assistant or co-surgeon be reported?
An assistant at surgery may be paid. Co-surgeon payment requires supporting documentation; team surgery is not permitted.
How does the multiple-procedure reduction affect 33771?
When multiple procedures are performed in the same session, the highest-valued procedure is paid in full and the others are subject to the standard 50% reduction.
Should modifier 50 be appended?
No. The bilateral adjustment does not apply to this code, and modifier 50 is inappropriate.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.
CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027
Show the CMS file lines behind this rate
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