No office rate
Both describe ascending-aortic graft replacement. Choose 33858 when the indication is aortic dissection; 33859 applies to other disease.
On this page
CMS RVU26D · Effective 2026-10-01
33858 Aortic graft Medicare reimbursement rates in Maine
Reports graft replacement of the ascending aorta for dissection, including operations performed with or without cardiopulmonary bypass. Compare 33858 office and facility rates across CMS payment localities in Maine.
Amounts below use the non-QP conversion factor for participating physicians. These are base physician payments before claim-level adjustments, not patient costs or total hospital charges.
What does Medicare pay for 33858 in Maine?
Maine has 2 payment localities in this comparison. Use the service location to choose the applicable amount. These are the supported base rates for the 2 payment areas shown below, using the same CMS release.
Office / nonfacility
No supported rate
Facility setting
$2895.78–$2939.96
2 of 2 localities have a supported rate.
These are locality ranges, not averages or address-specific quotes. A facility-setting amount covers the physician service; it does not include a hospital’s separate bill. Choose a locality below to inspect its calculation, compare other payment areas, or price a percentage of Medicare.
Cardiothoracic surgery
About 33858: Ascending aortic graft for dissection
Reports graft replacement of the ascending aorta for dissection, including operations performed with or without cardiopulmonary bypass.
Code 33858 describes open replacement of the ascending thoracic aorta with a graft to treat aortic dissection, commonly an acute dissection involving the ascending segment. Cardiothoracic surgeons perform this major operation in a hospital operating room. Cardiopulmonary bypass may be used, but its use does not change the code. The procedure addresses the dissected ascending aorta, rather than disease confined to another aortic segment.
Report the code when the operative report supports graft replacement of the ascending aorta specifically for dissection. Documentation should identify the dissection, the segment treated, and the graft replacement performed; distinguish this service from code 33859, for ascending-aortic graft replacement for other disease. The CMS 90-day global includes the day-before preoperative visit and related postoperative care during the following 90 days. For multiple procedures in the same session, the highest-valued procedure is paid in full and others are subject to the standard 50% reduction. An assistant at surgery may be paid; co-surgeon payment requires supporting documentation, and team surgery is not permitted.
CMS billing rules for 33858
- Global period
- Major surgery with a 90-day global period: the day-before preoperative visit and 90 days of related postoperative care are included.
- Multiple procedures
- Standard multiple procedure reduction: the highest-valued procedure is paid in full and others at 50% when performed in the same session.
- Bilateral procedures
- Bilateral adjustment does not apply; the descriptor or anatomy makes modifier 50 inappropriate.
- Assistant at surgery
- Assistant at surgery may be paid.
- Co-surgeons
- Co-surgeons paid only with supporting documentation.
- Team surgery
- Team surgery not permitted.
Where the value comes from
- Work RVU61.82 · 66%
- Practice expense (office) RVU16.69 · 18%
- Malpractice RVU15.31 · 16%
1.6K
Medicare services in 2024 · #2608 by national volume
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.
33858 compared with similar codes
Office rates for Maine, from the same CMS release.
No office rate
Compare the operative work with the full descriptor for 33863, which identifies additional operative elements; 33858 is selected for graft replacement specifically for dissection.
No office rate
Code 33866 describes aortic hemiarch graft work. Use 33858 for ascending-aortic graft replacement for dissection when the reported work is not the hemiarch service described by 33866.
Compare 33858 by payment locality
Find the payment area for your service address, then open its rate page for calculation inputs, release history and the percentage-of-Medicare tool. A city may cross payment-area boundaries; the ZIP lookup above helps resolve the location.
2 of 2 payment localities
Rest Of Maine →
Office / nonfacility
Unavailable
Facility
$2895.78
Southern Maine →
Office / nonfacility
Unavailable
Facility
$2939.96
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33858 billing questions
When should 33858 be used instead of 33859?
Use 33858 when the ascending aorta is replaced with a graft for dissection. Code 33859 is for ascending-aortic graft replacement for other disease, such as an aneurysm without dissection.
Does cardiopulmonary bypass determine whether 33858 applies?
No. Code 33858 covers ascending-aortic graft replacement for dissection with or without cardiopulmonary bypass.
What postoperative care is included in the global period?
The 90-day global includes the day-before preoperative visit and related postoperative care during the 90 days after surgery.
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.
How does the multiple-procedure reduction affect another procedure performed in the same session?
The highest-valued procedure is paid in full, and other procedures performed in the same session are subject to the standard 50% reduction.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense, and malpractice RVUs, adjusted by each locality’s geographic indices and the applicable conversion factor. Unavailable or separately priced services are labeled rather than assigned a made-up amount.
Source: RVU26D. Effective 2026-10-01 through the day before 2027-01-01.
4,08733851,,Exc coa rpr l subcl art/prst,A,,21.43,9.58,NA,9.58,,5.39,36.40,36.40,0,090,0.09,0.84,0.07,2,0,2,1,0,9,,33.4009,09,0,99,0.00,0.00,0.00
4,08833852,,Rpr hypopl a-arch wo byp,A,,23.80,10.04,NA,10.04,,6.00,39.84,39.84,0,090,0.09,0.84,0.07,2,0,2,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
4,08933853,,Rpr hypopl a-arch w/byp,A,,31.70,12.10,NA,12.10,,7.99,51.79,51.79,0,090,0.09,0.84,0.07,2,0,2,1,0,9,,33.4009,09,0,99,0.00,0.00,0.00
4,09033858,,As-aort grf f/aortic dsj,A,,61.82,16.69,NA,16.69,,15.31,93.82,93.82,0,090,0.09,0.84,0.07,2,0,2,1,0,9,,33.4009,09,0,99,0.00,0.00,0.00
4,09133859,,As-aort grf f/ds oth/thn dsj,A,,44.00,12.86,NA,12.86,,10.86,67.72,67.72,0,090,0.09,0.84,0.07,2,0,2,1,0,9,,33.4009,09,0,99,0.00,0.00,0.00
4,09233863,,Ascending aortic graft,A,,57.32,15.54,NA,15.54,,14.14,87.00,87.00,0,090,0.09,0.84,0.07,2,0,2,1,0,9,,33.4009,09,0,99,0.00,0.00,0.00
4,09333864,,Ascending aortic graft,A,,58.58,15.81,NA,15.81,,14.42,88.81,88.81,0,090,0.09,0.84,0.07,2,0,2,1,0,9,,33.4009,09,0,99,0.00,0.00,0.00