What is the global period for CPT 66821?

CPT 66821 has a 90-day global period, covering the surgery and all related postoperative care.

How do I bill YAG if it's within 90 days of cataract surgery?

If it's on the same eye due to a complication, use Modifier 78. If it's on the other eye (unrelated), use Modifier 79.

Is CPT 66821 subject to the 2.5% efficiency cut in 2026?

Yes. As a procedural, non-time-based code, it is subject to the -2.5% efficiency adjustment applied to work RVUs.

SpecialistBase2026 Compliant

CPT 66821

2026 Billing Guide

YAG Laser Capsulotomy

Reimbursement

$116.90

Threshold

N/A

2026 Status

Active

What is CPT Code 66821?

CPT 66821 is defined as: Discission of secondary membranous cataract (opacified posterior lens capsule and/or anterior hyaloid); laser surgery (e.g., YAG laser) (1 or more stages). This procedure involves using a laser to create an opening in the back of the lens capsule that has become cloudy after cataract surgery.

This code is primarily used for Specialist services. It falls under the category of Ophthalmology / Surgery and is valid for the 2026 calendar year according to the CMS Physician Fee Schedule.

2026 RVU Components

Relative Value Units (Non-Facility)

Standard Formula Applied

Work RVU

1.9

Physician Effort

PE (Non-Fac)

1.5

Practice Expense

Malpractice

Risk Factor

Total RVU

3.5

Note: [(Work RVU * Work GPCI) + (PE RVU * PE GPCI) + (MP RVU * MP GPCI)] * Conversion Factor

2026 CMS Policy Intelligence

efficiency adjustment

Subject to the -2.5% reduction in work RVUs as a non-time-based procedure.

site of service shift

CMS aggressively widens the spread between office ($206.90 projected for office-like procedures) and facility ($95.10 work portion) to incentivize migration to office settings.

facility rate cut

Projected 8% decrease in facility reimbursement.

Administrative Framework

Global Period

090

Place of Service

11 (Office)22 (Outpatient Hospital)24 (ASC)

NCCI Exclusions

Do not bill with:

Key Modifiers

78Unplanned Return to the Operating/Procedure Room by the Same Physician Following Initial Procedure for a Related Procedure During the Postoperative Period (used for PCO complications within 90-day global of 66984).

79Unrelated Procedure or Service by the Same Physician During the Postoperative Period (used for YAG on the OTHER eye during 90-day global of 66984).

Operational Requirements

minimum time

Procedure-based

staff type

Ophthalmologist

frequency

Typically once per eye per lifetime; subsequent procedures are rare.

add on codes

medical necessity

Documentation must support 'medically significant' opacity correlating with subjective complaints (glare, decreased vision) and objective slit-lamp findings.

Compliance Checklist

Objective slit-lamp findings of PCO.

Documentation of subjective visual impairment (glare, contrast sensitivity).

Modifier usage (78/79) if performed within the global period of the cataract surgery.

Audit Defense

No specific audit defense elements defined.

2026 Update

The shift in Practice Expense (PE) allocation significantly favors office-based performance over ASC/HOPD.

Common Clinical Scenarios

Patient presents with blurred vision and glare 6 months after cataract surgery; slit-lamp confirms dense PCO.

CMS Eligibility: 1 (Posterior Capsule Opacification). Permanent fix for PCO.

Target Specialties & Utilization

Ophthalmology

Typical Clinical Indications (ICD-10)

H26.40 (Unspecified secondary cataract)H26.411 (Soemmering's ring, right eye)H26.491 (Other secondary cataract, right eye)

Billing Differentiation

VS 66984

66984 is the initial cataract surgery; 66821 (YAG) treats the secondary opacity that may develop later.

Frequently Asked Questions

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Official Data Provider: CMS Physician Fee Schedule (2026)