No office rate
Both codes describe transluminal dilation of the aqueous outflow canal. Choose 66175 when a device or stent remains in place; choose 66174 when none is retained.
On this page
CMS RVU26D · Effective 2026-10-01
66175 Canal dilation Medicare reimbursement rates in Connecticut
Reports glaucoma surgery that dilates the aqueous outflow canal and leaves a stent or other device in place to support drainage. Compare 66175 office and facility rates across CMS payment localities in Connecticut.
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 66175 in Connecticut?
Connecticut 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
$653.87
1 of 1 localities have a supported rate.
Payment area: Connecticut
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 66175: Transluminal canal dilation with stent
Reports glaucoma surgery that dilates the aqueous outflow canal and leaves a stent or other device in place to support drainage.
An ophthalmic surgeon treats impaired aqueous drainage by passing an instrument through the outflow canal, dilating it, and leaving a stent or other device in place. The procedure is used for glaucoma when improving flow through the eye’s natural drainage pathway is the surgical goal. It is generally performed in an operating room, often with gonioscopic visualization, and may be done during the same session as cataract surgery.
Report 66175 when canal dilation includes retention of a device or stent; documentation should identify the treated eye, the dilation procedure, and the retained device. Dilation without a retained device is reported with 66174. 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 one session, the highest-valued 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 require supporting documentation, and team surgery is not permitted.
CMS billing rules for 66175
- 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 paid only with supporting documentation.
- Team surgery
- Team surgery not permitted.
Where the value comes from
- Work RVU9.11 · 49%
- Practice expense (office) RVU8.74 · 47%
- Malpractice RVU0.72 · 4%
470
Medicare services in 2024 · #3618 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.
66175 compared with similar codes
Office rates for Connecticut, from the same CMS release.
No office rate
66183 describes insertion of an anterior drainage device. 66175 is for dilation of the aqueous outflow canal with a device or stent retained there.
No office rate
66179 describes aqueous shunt surgery without a graft. Choose it for shunt placement rather than canal dilation with a retained stent.
No office rate
66180 describes aqueous shunt surgery with a graft. It is a different drainage procedure from dilation of the outflow canal under 66175.
Compare 66175 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
Connecticut →
Office / nonfacility
Unavailable
Facility
$653.87
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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 66175 in Connecticut.
PPRRVU2026_Oct_nonQPP.csv
7,369
- Code
- 66175
- Physician work
- 9.11
- Practice expense
- 8.74
- Malpractice
- 0.72
GPCI2026.csv
38
- Locality
- Connecticut
- Physician work
- 1.020
- Practice expense
- 1.077
- Malpractice
- 1.210
| Component | RVU | Locality factor | Adjusted |
|---|---|---|---|
| Physician work | 9.11 | × 1.020 | 9.2922 |
| Practice expense | 8.74 | × 1.077 | 9.4130 |
| Malpractice | 0.72 | × 1.210 | 0.8712 |
| Total RVUs | 19.5764 | ||
| Conversion factor | × 33.4009 | ||
Facility rate, Connecticut$653.87
Explore RVUs, geographic factors and the full formula
Facility
| Component | RVU | Local GPCI |
|---|---|---|
| Work | 9.11 | 1.02 |
| Practice expense | 8.74 | 1.077 |
| Malpractice | 0.72 | 1.21 |
(9.11 × 1.02 + 8.74 × 1.077 + 0.72 × 1.21) × $33.4009 = $653.87
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.
66175 billing questions
How do I choose between 66175 and 66174?
Use 66175 when a stent or other device is left in place after canal dilation. Use 66174 for canal dilation without a retained device.
Is the retained stent separately reported?
The retained device is part of the service represented by 66175. Do not report a separate code just for leaving that device in place.
Can 66175 be reported with cataract surgery?
It may be performed during the same session as cataract extraction. Document each procedure performed and apply the applicable same-session coding rules.
What supports reporting 66175?
The operative report should identify the treated eye, canal dilation, and the device or stent left in place. Those details distinguish this service from dilation without retained hardware.
How is bilateral 66175 reported under the CMS facts?
Use modifier 50 for a bilateral procedure; CMS pays it at 150%.
Does the 90-day global include related follow-up?
Yes. The global period includes the day-before preoperative visit and 90 days of related postoperative care.
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.
7,36666170,,Glaucoma surgery,A,,13.59,13.41,NA,13.41,,1.09,28.09,28.09,0,090,0.10,0.70,0.20,2,1,2,1,0,9,,33.4009,09,0,99,0.00,0.00,0.00
7,36766172,,Incision of eye,A,,14.47,15.18,NA,15.18,,1.16,30.81,30.81,0,090,0.10,0.70,0.20,2,1,2,1,0,9,,33.4009,09,0,99,0.00,0.00,0.00
7,36866174,,Trluml dil aq o/f can w/o st,A,,7.43,8.17,NA,8.17,,0.58,16.18,16.18,0,090,0.10,0.70,0.20,2,1,2,1,0,9,,33.4009,09,0,99,0.00,0.00,0.00
7,36966175,,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
3501112,CA,70,YUBA CITY,1.017,1.096,0.536
3601112,CA,75,REST OF CALIFORNIA,1.017,1.096,0.536
3704112,CO,01,COLORADO,1.012,1.064,0.781
3813102,CT,00,CONNECTICUT,1.020,1.077,1.210
3912202,DC,01,DC + MD/VA SUBURBS,1.054,1.178,1.113
4012102,DE,01,DELAWARE,1.005,0.988,0.899
4109102,FL,03,FORT LAUDERDALE,1.000,1.013,1.808