CPT code 66174: Canaloplasty, without retained stent2026 Medicare rate & RVUs in Iowa

In Iowa, Medicare pays $505.55 for 66174 in a facility. There’s no office rate.

Check a contract rate as a % of Medicare · 66174 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 66174 covers

An ophthalmologist reaches the drainage angle from inside the eye and enlarges Schlemm canal to improve aqueous outflow, leaving no implant or stent behind. The procedure is used to lower intraocular pressure in glaucoma and is typically performed in an operating room with gonioscopic visualization by an ophthalmologist, often one with glaucoma surgical expertise.

Report 66174 when the canal is dilated without a retained device; use 66175 when a device or stent remains. The operative report should identify the treated eye, the canal-dilation work, and whether an implant was left in place. CMS assigns a 90-day global period, including the day-before preoperative visit and 90 days of related postoperative care. In a same-session multiple-procedure claim, the highest-valued procedure is paid in full and other procedures at 50%. Modifier 50 bilateral payment is 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 Iowa compares for 66174

Across 109 of 109 payment localities, the facility rate for 66174 runs from $492.55 in Arkansas to $679.35 in San Benito County, CA. Iowa pays $505.55. The RVUs are the same everywhere; the geographic indexes change the dollars.

Every other payment area

66174 rates by state

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

See 66174 in every payment locality

How the 66174 rate is calculated

Each of 66174’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 66174

66174 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 66174

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

How 66174 has changed in Iowa

Price 66174 for an earlier date of service

Where the Iowa rate applies

Iowa is a Medicare payment area, not a city. Our Census mapping connects it to 1026 cities and communities in Iowa. Some span more than one payment area; confirm with the service ZIP.

• Ackley
• Ackworth
• Adair
• Adel
• Afton
• Agency
• Ainsworth
• Akron

Browse all communities in Iowa

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