Billing code 35663: Arterial bypassMedicare rate & RVUs in Oregon
Reports surgical bypass from one iliac artery to another using a nonvein conduit to reroute blood around a diseased or unusable arterial segment.
CMS doesn’t publish an office rate for 35663 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 35663 covers
A vascular surgeon creates a new route for blood flow between iliac arteries, bypassing a diseased or unusable segment. The graft is made from a nonvein conduit, commonly a synthetic graft. The operation is performed in a surgical setting for patients who need iliac revascularization; the documented origin and destination arteries distinguish this service from bypasses to the aorta, femoral artery, or another vascular territory.
Select the code based on the iliac-to-iliac route and nonvein conduit, not on the diagnosis alone. The operative report should identify the inflow and outflow arteries, bypass course, and graft material. 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 at 50%. Modifier 50 bilateral reporting is paid at 150%. An assistant at surgery may be paid; co-surgeons are paid only with 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 35663 pays more and less in Oregon
| Payment locality | Office | Facility |
|---|---|---|
| Portland | Unavailable | $1,085.90 |
| Rest Of Oregon | Unavailable | $1,050.16 |
How the 35663 rate is calculated
Each of 35663’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 · 35663
RVUs × geographic indexes × conversion factor
Swap in your local Medicare rate.
Work 23.33Practice expense 3.93Malpractice 5.97
All indexes start at 1.000 (the national rate). Enter a ZIP or drag a slider.
Payment rules and modifiers for 35663
35663 has a 90-day global period: related visits in that window are included in the surgery payment.
CMS payment indicators · 35663
Arterial bypass
| 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) | 1 | Bilateral with modifier 50 pays 150% of the fee schedule amount. |
| 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 · 35663
Arterial bypass
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 50 · payment effect
With and without the modifier
35663 without 50 · national facility
$1,109.91
Arterial bypass
35663-50 · Bilateral: 150%
$1,664.87
Both sides on one line with modifier 50 are paid at 150% of the fee schedule amount (subject to multiple-procedure rules with other procedures).
35663 compared with similar codes
Compare codes
35663 vs 35563 vs 35665 vs 35661 vs 35637: national Medicare rates
Swap in your local Medicare rate.
How to choose
- 35563Iliac bypass
- Both codes describe an ilio-iliac bypass, but 35563 is for a vein conduit; 35663 is for a nonvein conduit.
- 35665Arterial bypass
- Use 35665 when the bypass runs from an iliac artery to a femoral artery. This code requires iliac arteries at both ends.
- 35661Femoral bypass
- Use 35661 for a femoral-to-femoral bypass. This code describes an iliac-to-iliac route.
- 35637Aortoiliac bypass
- Use 35637 when the aorta supplies the bypass to an iliac artery; this code has an iliac artery as the source and destination.
35663 billing questions
How is this code distinguished from an iliofemoral bypass?
Use this code when both ends of the bypass are iliac arteries. A bypass from an iliac artery to a femoral artery follows a different route.
Does the graft material affect code selection?
Yes. This code describes an iliac-to-iliac bypass using a nonvein conduit. The vein-graft counterpart is 35563.
What should the operative report document?
Document the inflow and outflow arteries, the bypass route, and the conduit material. Those details support both the ilio-iliac anatomy and nonvein graft selection.
How are same-session procedures and bilateral reporting handled?
For multiple procedures in the same session, CMS pays the highest-valued procedure in full and other procedures at 50%. Bilateral reporting with modifier 50 is paid at 150%.
Are assistant or co-surgeon services payable?
An assistant at surgery may be paid. Co-surgeons are paid only with supporting documentation; team surgery is not permitted.
Which postoperative visits are 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
Show the CMS file lines behind this rate
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