CPT code 58958: Cancer debulking2026 Medicare rate & RVUs in Washington
Reports radical surgical debulking of recurrent ovarian, fallopian tube, or primary peritoneal malignancy, including extensive dissection and lymph node sampling.
CMS doesn’t publish an office rate for 58958 in Washington.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
On this page 9 sections
What 58958 covers
A gynecologic oncologist reports this code for operative debulking of recurrent ovarian, fallopian tube, or primary peritoneal cancer when the procedure includes radical dissection and lymph node sampling. The operation may also include omentectomy, removal of both ovaries and fallopian tubes, and total abdominal hysterectomy. It is generally performed in a hospital operating room when recurrent disease requires substantial tumor removal and dissection.
Select the code based on the recurrent malignancy and the documented operative work, not simply the organs removed. The operative report should establish the recurrence, sites addressed, extent of dissection, lymph node sampling, and any included organ resections. This is a bilateral-priced code; modifier 50 does not increase Medicare payment. A 90-day global period includes the day-before preoperative visit and related postoperative care. When multiple 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. Assistant-at-surgery payment may be made; 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 58958 pays more and less in Washington
| Payment locality | Office | Facility |
|---|---|---|
| Rest Of Washington | Unavailable | $1,443.57 |
| Seattle (King Cnty) | Unavailable | $1,546.40 |
How the 58958 rate is calculated
Each of 58958’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 · 58958
RVUs × geographic indexes × conversion factor
Work28.49
28.49 RVUs× 1.000 GPCI
Practice expense10.03
10.03 RVUs× 1.000 GPCI
Malpractice4.99
4.99 RVUs× 1.000 GPCI
Adjusted RVUs
43.5100
Conversion factor
$33.4009
Medicare rate
$1,453.27
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 58958
58958 has a 90-day global period: related visits in that window are included in the surgery payment.
CMS payment indicators · 58958
Cancer debulking
| 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) | 2 | Already bilateral by definition: paid once at 100%. |
| 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) | 0.12/0.74/0.14 | Share of the payment for pre-op, the procedure itself, and post-op care. |
Global surgery period · 58958
Cancer debulking
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 51 · payment effect
With and without the modifier
58958 without 51 · national facility
$1,453.27
Cancer debulking
58958-51 · Second procedure: 50%
$726.64
When this isn’t the highest-valued procedure in the session, Medicare pays 50% of its fee schedule amount (the highest is paid at 100%).
58958 compared with similar codes
Compare codes · National
58958 vs 58951 vs 58954: Medicare rates
How to choose
- 58951Ovarian cancer surgery
- Use 58951 for ovarian malignancy resection with radical debulking and lymph node sampling in the circumstances described by that code. This code is distinguished by treatment of recurrent ovarian, tubal, or primary peritoneal disease.
- 58954Cancer debulking
- 58954 describes ovarian malignancy resection with radical debulking and pelvic and para-aortic lymphadenectomy. This code describes recurrent ovarian, tubal, or primary peritoneal malignancy.
58958 billing questions
How does this differ from code 58957?
Both address recurrent ovarian, tubal, or primary peritoneal malignancy. Choose based on the operative service documented: this code describes radical debulking dissection that includes lymph node sampling, while 58957 describes extensive retroperitoneal dissection.
Can this be reported for a newly diagnosed ovarian malignancy?
This code is for recurrent ovarian, tubal, or primary peritoneal malignancy. Codes such as 58951 describe resection of ovarian malignancy with radical debulking work for a different disease circumstance.
Should modifier 50 be appended for bilateral work?
The code is already priced as bilateral under Medicare, so modifier 50 does not increase payment.
Are omentectomy, hysterectomy, and ovary removal separate services?
These may be performed as part of the debulking service described by this code. The operative report should identify which procedures were performed; do not assume each included procedure is separately reportable.
What documentation supports this code?
Document the recurrent malignancy, operative findings and sites treated, radical dissection, lymph node sampling, and any omentectomy, bilateral salpingo-oophorectomy, or hysterectomy performed.
How are other procedures in the same session paid?
Under the standard multiple procedure reduction, the highest-valued procedure is paid in full and other procedures are subject to a reduction when performed in the same session.
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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