No office rate
Use 66185 when graft material is part of the aqueous shunt revision; 66184 is the revision without a graft.
On this page
CMS RVU26D · Effective 2026-10-01
66184 Shunt revision Medicare reimbursement rates in Oklahoma
Revision of an existing glaucoma drainage shunt without a graft, reported when the surgeon corrects a shunt problem rather than placing a new device. Compare 66184 office and facility rates across CMS payment localities in Oklahoma.
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 66184 in Oklahoma?
Oklahoma has 1 payment locality in this comparison. Use the service location to choose the applicable amount. These are the supported base rates for the payment area shown below, using the same CMS release.
Office / nonfacility
No supported rate
Facility setting
$643.72
1 of 1 localities have a supported rate.
Payment area: Oklahoma
One mapped payment locality.
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.
Ophthalmology surgery
About 66184: Aqueous shunt revision without graft
Revision of an existing glaucoma drainage shunt without a graft, reported when the surgeon corrects a shunt problem rather than placing a new device.
An ophthalmic surgeon, often a glaucoma specialist, revises an existing aqueous shunt used to control intraocular pressure. The work may address a tube or reservoir problem, such as obstruction or malposition, to restore drainage or improve shunt function. This code distinguishes revision without a graft from revision that includes graft material, which is reported with 66185.
Select the code from the operative report’s description of the revision and whether graft material was used; do not use it for initial shunt placement. Documentation should identify the existing device, the problem addressed, the revision performed, and graft use or nonuse. 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 the same session, the highest-valued procedure is paid in full and 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.
CMS billing rules for 66184
- 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 procedure with modifier 50 is paid at 150%.
- Assistant at surgery
- Assistant at surgery may be paid.
- Co-surgeons
- Co-surgeons not permitted.
- Team surgery
- Team surgery not permitted.
Where the value comes from
- Work RVU9.34 · 45%
- Practice expense (office) RVU10.47 · 51%
- Malpractice RVU0.75 · 4%
890
Medicare services in 2024 · #3054 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.
66184 compared with similar codes
Office rates for Oklahoma, from the same CMS release.
No office rate
66179 represents initial aqueous shunt placement without a graft. Use 66184 when the surgeon revises an existing shunt without a graft.
No office rate
66180 represents initial aqueous shunt placement with a graft; it is not the code for revising an existing shunt.
Compare 66184 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.
1 of 1 payment localities
Oklahoma →
Office / nonfacility
Unavailable
Facility
$643.72
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How this local rate is calculated
Each RVU component is multiplied by its own geographic practice cost index (GPCI). The three adjusted components are added, then multiplied by the conversion factor. These are the inputs used for 66184 in Oklahoma.
PPRRVU2026_Oct_nonQPP.csv
7,373
- Code
- 66184
- Physician work
- 9.34
- Practice expense
- 10.47
- Malpractice
- 0.75
GPCI2026.csv
86
- Locality
- Oklahoma
- Physician work
- 1.000
- Practice expense
- 0.893
- Malpractice
- 0.777
| Component | RVU | Locality factor | Adjusted |
|---|---|---|---|
| Physician work | 9.34 | × 1.000 | 9.3400 |
| Practice expense | 10.47 | × 0.893 | 9.3497 |
| Malpractice | 0.75 | × 0.777 | 0.5827 |
| Total RVUs | 19.2725 | ||
| Conversion factor | × 33.4009 | ||
Facility rate, Oklahoma$643.72
Explore RVUs, geographic factors and the full formula
Facility
| Component | RVU | Local GPCI |
|---|---|---|
| Work | 9.34 | 1 |
| Practice expense | 10.47 | 0.893 |
| Malpractice | 0.75 | 0.777 |
(9.34 × 1 + 10.47 × 0.893 + 0.75 × 0.777) × $33.4009 = $643.72
The office and facility calculations use their respective practice-expense RVUs. The facility amount here is the physician fee, not a separate hospital or facility bill.
66184 billing questions
How is 66184 distinguished from 66185?
66184 is for aqueous shunt revision without a graft. Report 66185 when the revision includes a graft.
Can 66184 be reported for initial shunt placement?
No. It describes revision of an existing shunt; initial placement is represented by an insertion code such as 66179, 66180, or 66183, depending on the procedure.
What should the operative report document?
The report should identify the existing shunt, the problem being corrected, the revision performed, and whether graft material was used.
How is bilateral 66184 reported?
For bilateral surgery, report modifier 50. CMS pays the bilateral procedure at 150%.
What postoperative care is included?
The 90-day global period includes the day-before preoperative visit and 90 days of related postoperative care.
Can an assistant surgeon be reported?
Assistant-at-surgery payment may be made. CMS does not permit co-surgeons or team surgery 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 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.
7,37066179,,Aqueous shunt eye w/o graft,A,,13.65,12.91,NA,12.91,,1.09,27.65,27.65,0,090,0.10,0.70,0.20,2,1,2,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
7,37166180,,Aqueous shunt eye w/graft,A,,14.63,13.26,NA,13.26,,1.17,29.06,29.06,0,090,0.10,0.70,0.20,2,1,2,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
7,37266183,,Insert ant drainage device,A,,12.87,12.48,NA,12.48,,1.04,26.39,26.39,0,090,0.10,0.80,0.10,2,1,2,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
7,37366184,,Revision of aqueous shunt,A,,9.34,10.47,NA,10.47,,0.75,20.56,20.56,0,090,0.10,0.70,0.20,2,1,2,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
7,37466185,,Revise aqueous shunt eye,A,,10.32,10.81,NA,10.81,,0.83,21.96,21.96,0,090,0.10,0.70,0.20,2,1,2,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
7,37566225,,Repair/graft eye lesion,A,,12.31,10.44,NA,10.44,,1.00,23.75,23.75,0,090,0.10,0.70,0.20,2,1,1,1,0,9,,33.4009,09,0,99,0.00,0.00,0.00
7,37666250,,Follow-up surgery of eye,A,,6.92,15.03,,6.84,,0.55,22.50,14.31,0,090,0.10,0.70,0.20,2,1,1,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
8311502,NC,00,NORTH CAROLINA,1.000,0.933,0.639
8403302,ND,01,NORTH DAKOTA**,1.000,1.000,0.406
8515202,OH,00,OHIO,1.000,0.913,1.008
8604312,OK,00,OKLAHOMA,1.000,0.893,0.777
8702302,OR,01,PORTLAND,1.016,1.111,0.744
8802302,OR,99,REST OF OREGON,1.000,0.996,0.703
8912502,PA,01,METROPOLITAN PHILADELPHIA,1.018,1.041,1.193