CPT code 66683: Iris prosthesis, prosthetic iris implantation2026 Medicare rate & RVUs in Missouri
Reports surgical placement of an artificial iris to address substantial iris loss or deficiency, such as after ocular trauma or with congenital aniridia.
CMS doesn’t publish an office rate for 66683 in Missouri.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
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What 66683 covers
An ophthalmologist places a prosthetic iris inside the eye to address significant iris tissue loss or deficiency. Typical situations include traumatic loss of iris tissue or congenital aniridia causing symptoms such as glare or light sensitivity. The procedure is performed in an operating room; the surgeon positions the prosthesis and uses fixation when needed. This code is for implanting a prosthetic iris, rather than repairing or removing native iris tissue.
Report the service when the operative documentation supports implantation of an iris prosthesis, including the indication, eye treated, and placement or fixation performed. The service has a 90-day global period, which includes the day-before preoperative visit and 90 days of related postoperative care. For multiple procedures 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 is restricted; co-surgeons and team surgery are 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.
Where 66683 pays more and less in Missouri
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
| Payment locality | Office | Facility |
|---|---|---|
| Metropolitan Kansas City, MO | Unavailable | $642.93 |
| Metropolitan St. Louis, MO | Unavailable | $647.34 |
| Rest of Missouri | Unavailable | $620.83 |
How the 66683 rate is calculated
Each of 66683’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.
How the rate is built · 66683
RVUs × geographic indexes × conversion factor
Work10.40
10.40 RVUs× 1.000 GPCI
Practice expense8.56
8.56 RVUs× 1.000 GPCI
Malpractice0.83
0.83 RVUs× 1.000 GPCI
Adjusted RVUs
19.7900
Conversion factor
$33.4009
Medicare rate
$661.00
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 66683
66683 has a 90-day global period: related visits in that window are included in the surgery payment.
CMS payment indicators · 66683
Iris prosthesis, prosthetic iris implantation
| Rule | CMS value | What it means |
|---|---|---|
| Global period | 090 | Major surgery: the day before, the day of, and 90 days after are included. |
| Multiple procedures | 2 | Standard reduction: highest-valued procedure at 100%, others at 50%. |
| Bilateral (modifier 50) | 1 | Bilateral with modifier 50 pays 150% of the fee schedule amount. |
| Assistant at surgery (80/81/82/AS) | 1 | Not paid (statutory restriction). |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 0 | Physician service: no professional/technical split. |
| Split (54/55/56) | 0.10/0.70/0.20 | Share of the payment for pre-op, the procedure itself, and post-op care. |
Global surgery period · 66683
Iris prosthesis, prosthetic iris implantation
90-day global period ends
Dec 30, 2026
Covers Sep 30, 2026 through Dec 30, 2026 (92 days, including the day before surgery).
Visit on Oct 31, 2026
Day 30 of the 90-day post-op period: related follow-up care is included in the surgical payment.
Pre-op dayGlobal period
What modifiers do to the payment
Modifier 50 · payment effect
With and without the modifier
66683 without 50 · national facility
$661.00
Iris prosthesis, prosthetic iris implantation
66683-50 · Bilateral: 150%
$991.50
Both sides on one line with modifier 50 are paid at 150% of the fee schedule amount (subject to multiple-procedure rules with other procedures).
66683 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 66682Iris repairWith intraocular lens fixation
- 66683 is for implanting a prosthetic iris. 66682 is a repair procedure for native iris or ciliary body tissue.
- 66680Iris repairIris or ciliary body
- Choose 66683 when an artificial iris is implanted; 66680 describes repair of the iris or ciliary body rather than prosthetic replacement.
- 66605IridectomyCorneoscleral section
- 66605 is an iris removal procedure. It does not describe implantation of a prosthetic iris to address iris deficiency.
66683 billing questions
When should 66683 be chosen instead of an iris repair code?
Use 66683 when a prosthetic iris is implanted. A procedure that repairs native iris or ciliary body tissue without prosthesis implantation points to a repair code such as 66682.
Does 66683 include fixation of the prosthesis?
The procedure includes fixation when performed. The operative report should describe the prosthesis placement and any fixation used.
Can cataract surgery be reported during the same session?
A separately performed cataract operation may be reported when supported by the operative record. The multiple-procedure reduction applies when multiple procedures are performed in the same session.
How is bilateral implantation reported?
For bilateral procedures, 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 or co-surgeon be paid for this procedure?
Assistant-at-surgery payment is subject to a statutory restriction. Co-surgeons and team surgery are not permitted.
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
Show the CMS file lines behind this rate
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