CPT code 33777: TGA repair, atrial baffle, subpulmonary obstruction2026 Medicare rate & RVUs in Maryland
Reports transposition of the great arteries repair using an atrial baffle together with operative relief of subpulmonary obstruction.
CMS doesn’t publish an office rate for 33777 in Maryland.
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 33777 covers
This code describes repair of transposition of the great arteries using an atrial baffle to redirect venous blood, combined with surgical relief of obstruction below the pulmonary valve. The baffle approach is associated with Mustard- or Senning-type repairs. A congenital cardiac surgeon typically performs this open-heart operation in an operating room, often as part of complex congenital heart surgery.
Report the code when the operative record supports both the atrial baffle repair and treatment of subpulmonary obstruction; an atrial baffle alone does not capture the added obstruction repair. Documentation should identify the transposition repair method, the baffle work, and the obstructing anatomy and corrective work. CMS assigns a 90-day global period, including the day-before preoperative visit and 90 days of related postoperative care. When multiple procedures are performed in the same session, the highest-valued procedure is paid in full and other procedures are subject to the standard 50% multiple-procedure reduction. Modifier 50 is inappropriate. Assistant-at-surgery payment may be made; co-surgeons and team surgery are 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 33777 pays more and less in Maryland
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
| Payment locality | Office | Facility |
|---|---|---|
| Baltimore area, MD | Unavailable | $1,879.13 |
| Rest of Maryland | Unavailable | $1,760.22 |
| Washington, DC area | Unavailable | $1,925.99 |
How the 33777 rate is calculated
Each of 33777’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 · 33777
RVUs × geographic indexes × conversion factor
Work33.32
33.32 RVUs× 1.000 GPCI
Practice expense11.21
11.21 RVUs× 1.000 GPCI
Malpractice8.39
8.39 RVUs× 1.000 GPCI
Adjusted RVUs
52.9200
Conversion factor
$33.4009
Medicare rate
$1,767.58
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 33777
33777 has a 90-day global period: related visits in that window are included in the surgery payment.
CMS payment indicators · 33777
TGA repair, atrial baffle, subpulmonary obstruction
| 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) | 0 | Not permitted. |
| 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 · 33777
TGA repair, atrial baffle, subpulmonary obstruction
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
33777 without 51 · national facility
$1,767.58
TGA repair, atrial baffle, subpulmonary obstruction
33777-51 · Second procedure: 50%
$883.79
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%).
33777 compared with similar codes
Compare codes · National
5 codes, side by side
How to choose
- 33774Atrial baffle repairTransposition of great arteries
- Both describe transposition repair using an atrial baffle. This code also requires repair of subpulmonary obstruction.
- 33776Atrial switch repairWith VSD closure
- 33776 identifies an atrial-baffle repair with ventricular septal defect closure; this code identifies repair of subpulmonary obstruction.
- 33781Transposition repairSubpulmonary obstruction repair
- Both include repair of subpulmonary obstruction, but 33781 uses a reconstruction approach rather than an atrial-baffle approach.
- 33778Arterial switch repairAortic and pulmonary reconstruction
- 33778 describes transposition repair with aortic and pulmonary artery reconstruction. This code describes an atrial-baffle repair with subpulmonary obstruction relief.
33777 billing questions
How does this differ from 33774?
33774 describes a transposition repair using an atrial baffle. Use 33777 when the operation also includes surgical relief of subpulmonary obstruction.
Is the atrial baffle separately reported?
The baffle work is part of this combined repair. The operative documentation should support both the baffle procedure and the subpulmonary obstruction repair.
Can modifier 50 be reported?
No. The CMS bilateral adjustment does not apply to this code, and modifier 50 is inappropriate.
Can an assistant surgeon be paid?
CMS indicates that assistant-at-surgery payment may be made. Co-surgeons and team surgery are not permitted for this code.
What postoperative care is included?
The 90-day global period includes the day-before preoperative visit and 90 days of related postoperative care.
What happens when other procedures are performed in the same session?
The highest-valued procedure is paid in full, and other procedures are subject to the standard multiple-procedure reduction.
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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