CPT code 35633: Arterial bypass, iliac to mesenteric artery2026 Medicare rate & RVUs in Maryland
Reports open bypass using a non-vein graft from an iliac artery to a mesenteric artery to restore blood flow in mesenteric occlusive disease.
CMS doesn’t publish an office rate for 35633 in Maryland.
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 35633 covers
This code describes open arterial revascularization using a graft other than vein to carry blood from an iliac artery to a mesenteric artery, commonly the superior mesenteric artery. Vascular surgeons may perform it for mesenteric arterial occlusive disease when an open bypass is selected. The operative report should establish the inflow artery, mesenteric outflow target, conduit, and indication for revascularization.
Choose this code for the iliac-to-mesenteric route; a different inflow or outflow site points to a different bypass code. Document the graft path and each bypass performed during the session. Medicare 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 one session, the highest-valued procedure is paid in full and others at 50%. Modifier 50 applies to a bilateral procedure, 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 35633 pays more and less in Maryland
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
| Payment locality | Office | Facility |
|---|---|---|
| Baltimore area, MD | Unavailable | $1,914.53 |
| Rest of Maryland | Unavailable | $1,790.88 |
| Washington, DC area | Unavailable | $1,944.10 |
How the 35633 rate is calculated
Each of 35633’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 · 35633
RVUs × geographic indexes × conversion factor
Work38.13
38.13 RVUs× 1.000 GPCI
Practice expense6.11
6.11 RVUs× 1.000 GPCI
Malpractice9.72
9.72 RVUs× 1.000 GPCI
Adjusted RVUs
53.9600
Conversion factor
$33.4009
Medicare rate
$1,802.31
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 35633
35633 has a 90-day global period: related visits in that window are included in the surgery payment.
CMS payment indicators · 35633
Arterial bypass, iliac to mesenteric artery
| 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 · 35633
Arterial bypass, iliac to mesenteric artery
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
35633 without 50 · national facility
$1,802.31
Arterial bypass, iliac to mesenteric artery
35633-50 · Bilateral: 150%
$2,703.47
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).
35633 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 35632Arterial bypassIliac inflow to celiac artery
- Both use iliac inflow, but 35632 directs the graft to the celiac artery; 35633 directs it to a mesenteric artery.
- 35634Arterial bypassIliac-to-renal, non-vein graft
- The outflow target decides between them: 35634 is for an iliac-to-renal bypass, while 35633 is for an iliac-to-mesenteric bypass.
- 35631Aortic bypassCeliac, mesenteric, and renal targets
- Choose based on inflow and target: 35631 uses aortic inflow for visceral artery bypass, while 35633 uses iliac inflow to a mesenteric artery.
35633 billing questions
How is this code distinguished from 35632?
Use 35633 when the graft runs from an iliac artery to a mesenteric artery. Code 35632 describes an iliac-to-celiac bypass.
When would 35631 be a better fit?
Code 35631 is for an aortic inflow route to the specified visceral arteries. This code is for an iliac inflow to a mesenteric artery.
What operative details support reporting 35633?
The operative report should identify the iliac inflow, mesenteric outflow, graft conduit, and the bypass performed. These details distinguish the service from bypasses to other targets.
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.
How are multiple procedures in the same session paid?
The highest-valued procedure is paid in full; other procedures in that session are paid at 50% under the standard multiple procedure reduction.
Can an assistant or co-surgeon be reported?
An assistant at surgery may be paid. Co-surgeons are paid only with supporting documentation; team surgery is not permitted.
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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