CPT code 33774: Atrial baffle repair, transposition of great arteries2026 Medicare rate & RVUs in Guam
Reports surgical repair of transposition of the great arteries using an atrial baffle to redirect blood flow between the heart’s chambers.
CMS doesn’t publish an office rate for 33774 in Guam.
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 33774 covers
A congenital cardiac surgeon creates an intra-atrial baffle to redirect systemic and pulmonary venous blood in a patient with transposition of the great arteries. This atrial-switch approach includes procedures such as the Mustard or Senning operation; it differs from an arterial switch, which reconstructs the great arteries. The operation is performed as open-heart surgery in a hospital setting.
Report 33774 when the atrial baffle repair is performed without the additional procedures described by related codes for pulmonary artery band removal, ventricular septal defect closure, or subpulmonic obstruction repair. The operative report should establish the transposition anatomy and document the baffle reconstruction and any additional cardiac 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 multiple procedure reduction. Modifier 50 is inappropriate. Assistant-at-surgery payment may be available; 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.
33774 in Hawaii, Guam, HI
| Payment locality | Office | Facility |
|---|---|---|
| Hawaii, Guam, HI | Unavailable | $1,649.68 |
How the 33774 rate is calculated
Each of 33774’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 · 33774
RVUs × geographic indexes × conversion factor
Work30.94
30.94 RVUs× 1.000 GPCI
Practice expense12.25
12.25 RVUs× 1.000 GPCI
Malpractice7.81
7.81 RVUs× 1.000 GPCI
Adjusted RVUs
51.0000
Conversion factor
$33.4009
Medicare rate
$1,703.45
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 33774
33774 has a 90-day global period: related visits in that window are included in the surgery payment.
CMS payment indicators · 33774
Atrial baffle repair, transposition of great arteries
| 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 · 33774
Atrial baffle repair, transposition of great arteries
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
33774 without 51 · national facility
$1,703.45
Atrial baffle repair, transposition of great arteries
33774-51 · Second procedure: 50%
$851.73
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%).
33774 compared with similar codes
Compare codes · National
5 codes, side by side
How to choose
- 33775Atrial switch repairWith pulmonary band removal
- Choose 33775 when pulmonary artery band removal is part of the atrial-baffle repair; 33774 describes the baffle repair without that added procedure.
- 33776Atrial switch repairWith VSD closure
- 33776 identifies atrial-baffle repair that also includes closure of a ventricular septal defect. Use 33774 when that added closure is not part of the operation.
- 33777TGA repairAtrial baffle, subpulmonary obstruction
- 33777 is for atrial-baffle repair with repair of subpulmonic obstruction. 33774 describes the baffle repair without that additional repair.
- 33778Arterial switch repairAortic and pulmonary reconstruction
- 33778 involves reconstruction of the great arteries in transposition. 33774 instead reroutes blood at the atrial level with a baffle.
33774 billing questions
How is 33774 different from an arterial switch?
33774 describes an atrial-level baffle that redirects venous blood. An arterial switch, represented by 33778, reconstructs the great arteries instead.
When should 33775, 33776, or 33777 be considered instead?
Use the corresponding related code when the atrial-baffle repair includes pulmonary artery band removal, ventricular septal defect closure, or repair of subpulmonic obstruction, respectively.
What documentation supports reporting 33774?
The operative report should identify the transposition anatomy and describe the atrial baffle reconstruction. It should also document any additional procedures that may distinguish a related code.
Can an assistant or co-surgeon be reported?
Assistant-at-surgery payment may be made. Co-surgeon payment requires supporting documentation; team surgery is not permitted.
Does modifier 50 apply to this repair?
No. CMS identifies bilateral adjustment as inappropriate 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.
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
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