Billing code 67331: Strabismus surgeryMedicare rate & RVUs in Oregon
This add-on reports added complexity during strabismus surgery when prior eye surgery or restrictive myopathy affects one or more extraocular muscles.
CMS doesn’t publish an office rate for 67331 in Oregon.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
On this page 9 sections
What 67331 covers
An ophthalmologist reports this add-on with a primary strabismus procedure when prior eye surgery or restrictive myopathy, such as thyroid-related restriction, makes surgery on one or more extraocular muscles more complex. It represents added work during the muscle operation, not a separate postoperative examination. These cases are generally managed in an operating room, with the surgeon addressing the alignment problem and the effects of prior surgery or muscle restriction.
Report 67331 only with the primary procedure; it is paid within that procedure’s global period. The operative report should support the underlying strabismus procedure and document the prior eye surgery or restrictive myopathy affecting the surgical work. CMS lists bilateral reporting with modifier 50 as paid at 150%. The primary procedure identifies the muscle surgery performed; this add-on identifies the qualifying complexity.
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 67331 pays more and less in Oregon
| Payment locality | Office | Facility |
|---|---|---|
| Portland | Unavailable | $103.92 |
| Rest Of Oregon | Unavailable | $99.16 |
How the 67331 rate is calculated
Each of 67331’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 · 67331
RVUs × geographic indexes × conversion factor
Swap in your local Medicare rate.
Work 1.95Practice expense 0.91Malpractice 0.16
All indexes start at 1.000 (the national rate). Enter a ZIP or drag a slider.
Payment rules and modifiers for 67331
The CMS indicators that decide how 67331 is paid alongside other services.
CMS payment indicators · 67331
Strabismus surgery
| Rule | CMS value | What it means |
|---|---|---|
| Global period | ZZZ | Add-on code: falls within the primary procedure’s global period. |
| Multiple procedures | 0 | No multiple-procedure reduction. |
| 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) | 1 | Permitted with supporting documentation. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 0 | Physician service: no professional/technical split. |
What modifiers do to the payment
Modifier 50 · payment effect
With and without the modifier
67331 without 50 · national facility
$100.87
Strabismus surgery
67331-50 · Bilateral: 150%
$151.31
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).
67331 compared with similar codes
Compare codes
67331 vs 67311 vs 67314 vs 67332: national Medicare rates
Swap in your local Medicare rate.
How to choose
- 67311Eye muscle surgery
- 67311 reports the primary recession or resection procedure for one horizontal muscle. Add 67331 only when the prior-surgery or restrictive-myopathy circumstance also applies.
- 67314Eye muscle surgery
- 67314 reports the primary procedure for one vertical muscle. It does not by itself represent the added complexity captured by 67331.
- 67332Strabismus surgery
- Both are strabismus-surgery add-ons, but 67332 is associated with reoperation. Use 67331 for the prior-eye-surgery or restrictive-myopathy circumstance described for that code.
67331 billing questions
When is 67331 reported with strabismus surgery?
Report it with a primary strabismus procedure when prior eye surgery or restrictive myopathy affects the work on one or more extraocular muscles. It is an add-on, not a standalone follow-up service.
What documentation supports 67331?
The operative report should identify the primary muscle procedure and describe the prior eye surgery or restrictive myopathy that affected the surgical work.
Can 67331 be billed by itself?
No. CMS identifies it as an add-on that must be billed with a primary procedure, and payment is within that procedure’s global period.
How is bilateral 67331 reported?
CMS lists bilateral reporting with modifier 50, paid at 150%.
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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