Billing code 58820: Ovarian abscess drainageMedicare rate & RVUs in Oklahoma
Open surgical drainage of an ovarian abscess is reported when a gynecologic surgeon evacuates the abscess through direct operative access.
CMS doesn’t publish an office rate for 58820 in Oklahoma.
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 58820 covers
A gynecologic surgeon uses open operative access to reach and drain an ovarian abscess, evacuating the infected collection. The procedure is typically performed in an operating room when direct surgical access is used rather than a percutaneous drainage route. Operative findings should support treatment of an abscess, not simply drainage of an ovarian cyst.
Report the service when the operative record documents the abscess, open approach, side or sides treated, and drainage performed. The 90-day global period includes the day-before preoperative visit and 90 days of related postoperative care. When multiple procedures are performed in the same session, the highest-valued procedure is paid in full and the others at 50%. Bilateral reporting with modifier 50 is paid at 150%. An assistant at surgery may be paid; co-surgeons and team surgery are 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.
58820 in Oklahoma
| Payment locality | Office | Facility |
|---|---|---|
| Oklahoma | Unavailable | $284.36 |
How the 58820 rate is calculated
Each of 58820’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 · 58820
RVUs × geographic indexes × conversion factor
Work4.58
4.58 RVUs× 1.000 GPCI
Practice expense3.70
3.70 RVUs× 1.000 GPCI
Malpractice0.81
0.81 RVUs× 1.000 GPCI
Adjusted RVUs
9.0900
Conversion factor
$33.4009
Medicare rate
$303.61
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 58820
58820 has a 90-day global period: related visits in that window are included in the surgery payment.
CMS payment indicators · 58820
Ovarian abscess drainage
| 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) | 0 | Not permitted. |
| 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 · 58820
Ovarian abscess drainage
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
58820 without 50 · national facility
$303.61
Ovarian abscess drainage
58820-50 · Bilateral: 150%
$455.42
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).
58820 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 58822Abscess drainage
- Both codes address an ovarian abscess, but 58820 is for open drainage and 58822 is for percutaneous drainage.
- 58800Ovarian cyst drainage
- Use 58800 for ovarian cyst drainage by vaginal approach. An abscess treated by open operative drainage is reported with 58820.
- 58805Cyst drainage
- Use 58805 for ovarian cyst drainage by abdominal approach. The diagnosis and treatment of an ovarian abscess distinguish 58820.
58820 billing questions
How is this code distinguished from 58822?
Use 58820 for open operative drainage of an ovarian abscess. Code 58822 describes percutaneous drainage of an ovarian abscess.
Can this code be used for drainage of an ovarian cyst?
No. This code is for an ovarian abscess; 58800 or 58805 may apply to ovarian cyst drainage, depending on the approach.
What documentation supports reporting this code?
The operative report should establish that the treated collection was an ovarian abscess and describe the open approach, the side or sides, and the drainage performed.
How is bilateral drainage reported?
When the procedure is bilateral, report modifier 50. CMS pays the bilateral procedure at 150%.
What postoperative care is included?
The 90-day global includes the day-before preoperative visit and related postoperative care through the 90-day period.
Can an assistant or co-surgeon be reported?
An assistant at surgery may be paid. Co-surgeons and team surgery are not permitted for this code.
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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