CPT code 35566: Leg bypass2026 Medicare rate & RVUs

Medicare pays $1,501.70 for 35566 nationally in a facility.

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

What 35566 covers

A vascular surgeon uses a vein conduit to route blood from a femoral artery to an anterior tibial, posterior tibial, or peroneal artery. The distal target is in the lower leg, beyond the popliteal level. This bypass is commonly performed in a hospital operating room for severe peripheral arterial disease when restoring flow to the foot or lower leg is needed. The operative report should identify the inflow artery, the specific outflow vessel, the conduit, and the bypass performed.

Choose this code for the femoral inflow and tibial or peroneal outflow combination; a femoral-to-popliteal bypass or a bypass beginning at a tibial artery has a different code. Medicare assigns a 90-day global period, including the day-before preoperative visit and 90 days of related postoperative care. When multiple procedures occur in the same session, the highest-valued procedure is paid in full and others at 50%. Bilateral reporting with modifier 50 is paid at 150%. An assistant at surgery may be paid; co-surgeons require 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 35566 pays more and less

The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.

109 of 109 payment localities

35566 rates by state

Office rate range in each state. Select a state to see its payment localities.

How the 35566 rate is calculated

Each of 35566’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.

Payment rules and modifiers for 35566

35566 has a 90-day global period: related visits in that window are included in the surgery payment.

What modifiers do to the payment

When to use modifier 50

35566 compared with similar codes

How to choose

35556Arterial bypass

35556 ends at the popliteal artery. This code is for a more distal outflow target: an anterior tibial, posterior tibial, or peroneal artery.

35570Arterial bypass

35570 describes a bypass beginning at a tibial artery and ending at another tibial or peroneal artery. This code begins at a femoral artery.

35585Vein bypass

35585 is the in-situ vein option for a femoral-to-tibial or peroneal route. This code represents the other vein-bypass approach.

35666Leg bypass

35666 uses a conduit other than vein for the femoral-to-tibial or peroneal bypass; this code is the vein-conduit option.

Codes related to 35566

Related codes aren’t interchangeable: bill the code that matches the service performed.

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

Open CMS sourceHow we calculate rates