CPT code 35583: Vein bypass, in situ, femoral to popliteal2026 Medicare rate & RVUs in Illinois
Reports an in-situ autologous vein bypass from the femoral artery to the popliteal artery for lower-extremity arterial disease.
CMS doesn’t publish an office rate for 35583 in Illinois.
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 35583 covers
A vascular surgeon uses this procedure to bypass an obstructed or severely diseased artery in the leg, routing blood from the femoral artery to the popliteal artery through the patient’s vein left in its native position. The great saphenous vein is a typical conduit. The surgeon prepares the vein for arterial flow, including disrupting its valves and addressing side branches, and connects it to the arterial inflow and popliteal outflow. These bypasses are generally performed in a hospital operating room for limb ischemia or other significant lower-extremity arterial insufficiency.
Select this code when the operative report documents an in-situ vein conduit and a popliteal target; a bypass using a harvested, repositioned vein or a different conduit follows a different code pathway. Documentation should identify the conduit, bypass endpoints, and in-situ technique. CMS assigns a 90-day global period, including the day-before preoperative visit and related postoperative care for 90 days. In a same-session multiple-procedure claim, the highest-valued procedure is paid in full and other procedures at 50%. Modifier 50 payment for a bilateral procedure is 150%. 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 35583 pays more and less in Illinois
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
| Payment locality | Office | Facility |
|---|---|---|
| Chicago, IL | Unavailable | $1,607.16 |
| East St. Louis, IL | Unavailable | $1,521.88 |
| Rest of Illinois | Unavailable | $1,416.91 |
| Suburban Chicago, IL | Unavailable | $1,490.49 |
How the 35583 rate is calculated
Each of 35583’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 · 35583
RVUs × geographic indexes × conversion factor
Work27.06
27.06 RVUs× 1.000 GPCI
Practice expense5.03
5.03 RVUs× 1.000 GPCI
Malpractice6.89
6.89 RVUs× 1.000 GPCI
Adjusted RVUs
38.9800
Conversion factor
$33.4009
Medicare rate
$1,301.97
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 35583
35583 has a 90-day global period: related visits in that window are included in the surgery payment.
CMS payment indicators · 35583
Vein bypass, in situ, femoral to popliteal
| 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 · 35583
Vein bypass, in situ, femoral to popliteal
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
35583 without 50 · national facility
$1,301.97
Vein bypass, in situ, femoral to popliteal
35583-50 · Bilateral: 150%
$1,952.96
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).
35583 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 35556Arterial bypassVein graft, femoral to popliteal
- Both address a femoral-to-popliteal vein bypass, but this code identifies an in-situ conduit. Choose 35556 when the documented bypass technique is not in situ.
- 35585Vein bypassFemoral to tibial or peroneal
- Both describe in-situ vein bypasses, but 35585 has tibial or peroneal outflow rather than a popliteal target.
- 35656Arterial bypassFemoral to popliteal, non-vein
- This code describes an in-situ vein bypass; 35656 is the femoral-popliteal bypass pathway for a conduit other than vein.
35583 billing questions
How is this different from 35556?
This code is for an in-situ vein bypass to the popliteal artery. Code 35556 is the related femoral-popliteal vein bypass option when the operative technique is not in situ.
What documentation supports the in-situ technique?
The operative report should identify the vein conduit as remaining in its native position and describe the femoral inflow, popliteal outflow, and preparation of the vein for arterial flow.
Are related postoperative visits included?
Yes. The 90-day global period includes the day-before preoperative visit and related postoperative care during the 90 days after surgery.
How is this code handled with other procedures in the same session?
CMS pays the highest-valued procedure in full and other procedures at 50% under the standard multiple-procedure reduction.
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 is a bilateral procedure paid?
When the bilateral procedure is reported with modifier 50, CMS payment is 150%.
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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