CPT code 66175: Canal dilation, with retained stent2026 Medicare rate & RVUs in South Dakota

In South Dakota, Medicare pays $604.29 for 66175 in a facility. There’s no office rate.

Check a contract rate as a % of Medicare · 66175 nationwide

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

What 66175 covers

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.

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.

How South Dakota compares for 66175

Across 109 of 109 payment localities, the facility rate for 66175 runs from $567.43 in Arkansas to $780.57 in Alaska. South Dakota pays $604.29. The RVUs are the same everywhere; the geographic indexes change the dollars.

Every other payment area

66175 rates by state

Office rate range in each state. Select a state to see its payment localities.

See 66175 in every payment locality

How the 66175 rate is calculated

Each of 66175’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.

Payment rules and modifiers for 66175

66175 has a 90-day global period: related visits in that window are included in the surgery payment.

What modifiers do to the payment

When to use modifier 50

Codes related to 66175

Related codes aren’t interchangeable: bill the code that matches the service performed.

How 66175 has changed in South Dakota

Price 66175 for an earlier date of service

Where the South Dakota rate applies

South Dakota is a Medicare payment area, not a city. Our Census mapping connects it to 485 cities and communities in South Dakota. Some span more than one payment area; confirm with the service ZIP.

• Aberdeen
• Agar
• Agency Village
• Akaska
• Albee
• Alcester
• Alexandria
• Allen

Browse all communities in South Dakota

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

Open CMS sourceHow we calculate rates