No office rate
Use 66183 for the external drainage device without an extraocular reservoir. Code 66179 describes a shunt with an extraocular reservoir and no graft.
On this page
CMS RVU26D · Effective 2026-10-01
66183 Drainage device Medicare reimbursement rates in Iowa
Reports external placement of an aqueous drainage device without a plate reservoir to create an alternate outflow pathway for glaucoma treatment. Compare 66183 office and facility rates across CMS payment localities in Iowa.
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 66183 in Iowa?
Iowa 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
$825.07
1 of 1 localities have a supported rate.
Payment area: Iowa
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.
Glaucoma surgery
About 66183: External aqueous drainage device insertion
Reports external placement of an aqueous drainage device without a plate reservoir to create an alternate outflow pathway for glaucoma treatment.
An ophthalmic surgeon places a small drainage device through the eye wall to direct aqueous humor from the anterior chamber toward the subconjunctival space. The procedure is used to lower intraocular pressure in patients with glaucoma when a drainage pathway is selected as the surgical treatment. It differs from a plate shunt because the device does not use an extraocular reservoir. The service is generally performed in an operating room or other surgical setting by an ophthalmologist.
Report the code for the external approach and document the glaucoma indication, operative approach, device placement, and the absence of an extraocular reservoir. CMS 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 other procedures are subject to the standard 50% reduction. Bilateral reporting with modifier 50 is paid at 150%. Assistant-at-surgery payment may be allowed; co-surgeons and team surgery are not permitted.
CMS billing rules for 66183
- 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 RVU12.87 · 49%
- Practice expense (office) RVU12.48 · 47%
- Malpractice RVU1.04 · 4%
11.4K
Medicare services in 2024 · #1409 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.
66183 compared with similar codes
Office rates for Iowa, from the same CMS release.
No office rate
Code 66180 describes a shunt with an extraocular reservoir and a graft; 66183 is for a device without that reservoir.
No office rate
Code 66174 is for transluminal dilation of the aqueous outflow canal without a stent. This code is for placement of an external drainage device without an extraocular reservoir.
Compare 66183 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
Iowa →
Office / nonfacility
Unavailable
Facility
$825.07
Need rates for a whole code list?
Fee-sheet and API access are in early access. Tell us which codes and locations your team needs.
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 66183 in Iowa.
PPRRVU2026_Oct_nonQPP.csv
7,372
- Code
- 66183
- Physician work
- 12.87
- Practice expense
- 12.48
- Malpractice
- 1.04
GPCI2026.csv
53
- Locality
- Iowa
- Physician work
- 1.000
- Practice expense
- 0.915
- Malpractice
- 0.397
| Component | RVU | Locality factor | Adjusted |
|---|---|---|---|
| Physician work | 12.87 | × 1.000 | 12.8700 |
| Practice expense | 12.48 | × 0.915 | 11.4192 |
| Malpractice | 1.04 | × 0.397 | 0.4129 |
| Total RVUs | 24.7021 | ||
| Conversion factor | × 33.4009 | ||
Facility rate, Iowa$825.07
Explore RVUs, geographic factors and the full formula
Facility
| Component | RVU | Local GPCI |
|---|---|---|
| Work | 12.87 | 1 |
| Practice expense | 12.48 | 0.915 |
| Malpractice | 1.04 | 0.397 |
(12.87 × 1 + 12.48 × 0.915 + 1.04 × 0.397) × $33.4009 = $825.07
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.
66183 billing questions
How does this differ from codes 66179 and 66180?
This code describes a device without an extraocular plate reservoir. Codes 66179 and 66180 describe aqueous shunts that use an extraocular reservoir.
What operative details support reporting this code?
Document the glaucoma indication, the external approach, the device placed, and its position creating an aqueous outflow route. The record should distinguish the device from a shunt with an extraocular reservoir.
What postoperative care is included?
The 90-day global period includes the day-before preoperative visit and 90 days of related postoperative care.
How is bilateral surgery reported?
CMS identifies this as a bilateral procedure; modifier 50 is paid at 150%. Document the procedure on each eye.
Can an assistant or co-surgeon be reported?
Assistant-at-surgery payment may be allowed. Co-surgeons and team surgery are not permitted under the CMS rules 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.
7,36966175,,Trluml dil aq o/f can w/st,A,,9.11,8.74,NA,8.74,,0.72,18.57,18.57,0,090,0.10,0.70,0.20,2,1,2,1,0,9,,33.4009,09,0,99,0.00,0.00,0.00
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
5006102,IL,15,SUBURBAN CHICAGO,1.007,1.027,1.772
5106102,IL,99,REST OF ILLINOIS,1.000,0.913,1.563
5208102,IN,00,INDIANA,1.000,0.927,0.486
5305102,IA,00,IOWA,1.000,0.915,0.397
5405202,KS,00,KANSAS,1.000,0.904,0.504
5515102,KY,00,KENTUCKY,1.000,0.889,0.915
5607202,LA,01,NEW ORLEANS,1.000,0.941,1.136