CPT code 35637: Aortoiliac bypass, aorta to one iliac artery2026 Medicare rate & RVUs

Medicare pays $1,507.72 for 35637 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 35637 covers

This code describes an open vascular bypass that routes blood from the abdominal aorta to one iliac artery using a conduit other than vein, commonly a prosthetic graft. A vascular surgeon typically performs it in a hospital operating room for significant aortoiliac occlusive disease when direct flow to the iliac circulation needs to be restored. The code is distinguished by the aortic inflow, the iliac outflow, and the non-vein conduit.

Choose the code from the operative report’s documented inflow, outflow, and conduit; a bypass to both iliac arteries or to a femoral artery has a different code. The report should support the treated vessels and graft used. This major operation has a 90-day global period that includes the day-before preoperative visit and related postoperative care during that period. When 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. Modifier 50 is inappropriate. 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 35637 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

35637 rates by state

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

How the 35637 rate is calculated

Each of 35637’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 35637

35637 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 51

35637 compared with similar codes

How to choose

35638Aortic bypassBilateral iliac targets

Use 35637 when the bypass runs from the aorta to one iliac artery; use 35638 when both iliac arteries are outflow targets.

35646Aortic bypassTo both femoral arteries

35646 describes an aortic bypass to both femoral arteries. This code is for an iliac outflow target, not bilateral femoral targets.

35647Aortic bypassSingle femoral target

35647 is for an aortic bypass to one femoral artery. Select this code when the documented distal target is femoral rather than iliac.

Codes related to 35637

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