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How to code YAG capsulotomies
January 18, 2026
Learn the six key aspects of proper coding and documentation to support these laser procedures.
Key Takeaways
- A historic and growing number of U.S. states currently allow doctors of optometry to perform office-based laser procedures.
- This scope of practice expansion has had a positive effect on patient access to critical eye care, according to research.
- If you are offering office-based laser procedures, such as YAG (yttrium aluminum garnet) capsulotomy, you’ll need to know how to properly code and document it for insurance.
Excerpted from page 20 of the Winter 2025 edition of AOA Focus. Written by the AOA’s Coding & Reimbursement Committee
A historic and growing number of U.S. states currently allow doctors of optometry to perform office-based laser procedures: Alaska, Arkansas, Colorado, Indiana, Kentucky, Louisiana, Mississippi, Montana, Oklahoma, South Dakota, Virginia, West Virginia, Wisconsin and Wyoming. This scope of practice expansion has had a positive effect on patient access to critical eye care, with patients on Medicare and those in rural communities experiencing the greatest benefits, according to research published in 2025 from West Virginia University. In the paper, “Expanded Scope of Practice for Optometrists and Access to Laser Eye Surgery,” the authors note: “These findings suggest that expanding optometrist scope of practice fills a gap in eye care, given the shortage of ophthalmologists, especially in rural areas.”
If you are offering office-based laser procedures, such as YAG (yttrium aluminum garnet) capsulotomy, you’ll need to know how to properly code and document it for insurance. Below is a primer. Be sure to consult your Medicare contractor’s Local Coverage Determination to ensure adherence with local requirements.
Complete an operative report.
In general, a separate operative report for the procedure must be developed and contain:
- Preoperative planning (specific notation of the capsular opacity in the clinical record, paired with the identification of a patient complaint, followed by presentation of the surgical solution with acknowledgment by the patient of the problem and submission to the surgery as well as the execution of informed consent)
- Indications for the procedure
- Detailed description of the procedure
- Possible complications and side effects
- Discharge instructions
- Clearly documented written, signed and dated consent
Confirm appropriate timing.
Typically, YAG is performed no less than 90 days following cataract extraction.
- YAG performed less than 90 days post-cataract extraction is unusual and must meet specific payer guidelines
- Percentage of patients requiring YAG varies greatly among ophthalmic surgeons
Establish and document medical necessity.
Common indications include:
- Visual loss and/or symptoms of glare (visual acuity ≤20/30 Snellen conditions: contrast sensitivity, or simulated glare testing)
- Symptoms of decreased contrast
- Amount of posterior capsular opacification
Report the correct CPT code.
66821: Discission of secondary membranous cataract (opacified posterior lens capsule and/or anterior hyaloid); laser surgery (e.g., YAG laser) (one or more stages)
Select the most appropriate ICD-10 diagnosis code to support the performance of the procedure.
Typical diagnosis codes include:
H26.491: Other secondary cataract, right eye
H26.492: Other secondary cataract, left eye
H26.493: Other secondary cataract, bilateral
T85.21XA: Breakdown (mechanical) of intraocular lens, initial encounter
T85.29XA: Other mechanical complication of intraocular lens, initial encounter
Add modifiers as indicated and account for the 90-day global period.
- Modifier -25: Should be appended to procedures if performed on same day as unrelated E&M.
- Modifier -79: Should be appended during postoperative period of another procedure.
- Modifier -55: Should be appended during postoperative period if only co-managing.
- Modifier -54: Should be appended at time of surgery if only doing the preoperative and operative care.
- Modifier -RT/-LT: Always use to indicate the appropriate eye that surgery was performed on.
- Modifier-50 (bilateral procedure): Use when the procedure is performed on both eyes during the same operative session. It’s important to check payer policies as some may require billing each eye separately with -LT and -RT.