CPT code 33766: Glenn shunt2026 Medicare rate & RVUs in Oregon
Reports a congenital heart operation connecting the superior vena cava to the pulmonary artery serving one lung, commonly for staged single-ventricle palliation.
CMS doesn’t publish an office rate for 33766 in Oregon.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
On this page 9 sections
What 33766 covers
A congenital cardiac surgeon creates a cavopulmonary connection by joining the superior vena cava to the pulmonary artery supplying one lung. This unilateral Glenn-type shunt redirects upper-body venous blood toward that lung and is used in selected congenital heart defects, often as part of staged palliation for single-ventricle physiology. The operative report should establish the vessels joined and that the connection serves one lung.
Select this code when the documented connection is to one lung; the bilateral-lung version is 33767. Record the anatomy, operative work, and clinical indication so the unilateral procedure can be distinguished from other systemic-to-pulmonary shunts. 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 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.
Where 33766 pays more and less in Oregon
| Payment locality | Office | Facility |
|---|---|---|
| Portland | Unavailable | $1,252.99 |
| Rest Of Oregon | Unavailable | $1,198.69 |
How the 33766 rate is calculated
Each of 33766’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 · 33766
RVUs × geographic indexes × conversion factor
Work22.98
22.98 RVUs× 1.000 GPCI
Practice expense8.88
8.88 RVUs× 1.000 GPCI
Malpractice5.78
5.78 RVUs× 1.000 GPCI
Adjusted RVUs
37.6400
Conversion factor
$33.4009
Medicare rate
$1,257.21
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 33766
33766 has a 90-day global period: related visits in that window are included in the surgery payment.
CMS payment indicators · 33766
Glenn shunt
| 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 · 33766
Glenn shunt
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
33766 without 51 · national facility
$1,257.21
Glenn shunt
33766-51 · Second procedure: 50%
$628.61
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%).
33766 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 33767Cavopulmonary shunt
- Use 33766 for a connection serving one lung; 33767 identifies the superior vena cava-to-pulmonary artery shunt serving both lungs.
- 33768Cavopulmonary anastomosis
- 33768 describes a secondary cavopulmonary anastomosis. Choose 33766 when the documented operation is the unilateral superior vena cava-to-pulmonary artery shunt.
- 33750Systemic-to-pulmonary shunt
- 33750 is a subclavian-to-pulmonary artery shunt; 33766 uses the superior vena cava as the systemic venous connection.
33766 billing questions
How does 33766 differ from 33767?
33766 describes a superior vena cava-to-pulmonary artery connection serving one lung. Use 33767 when the connection serves both lungs.
Should modifier 50 be appended for a bilateral operation?
No. CMS identifies bilateral adjustment as inappropriate for this code; the both-lungs procedure is represented by 33767.
What documentation supports reporting 33766?
The operative report should identify the superior vena cava and pulmonary artery joined, establish that the connection serves one lung, and describe the congenital indication.
How does the 90-day global period affect postoperative billing?
The day-before preoperative visit and 90 days of related postoperative care are included in the global period.
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.
What happens if 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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