Eye Care Coding Reference
CPT 66984 routine cataract surgery.
What the code covers, how it differs from 66982, the 90-day global period, co-management with modifiers 54 and 55, premium lens billing and the documentation Medicare contractors look for. Last reviewed October 2026.
In one paragraph
The standard cataract code.
CPT 66984 covers standard cataract removal, most often by phacoemulsification, with an intraocular lens placed in the same session. It carries a 90-day global period, is often shared between a surgeon and a co-managing optometrist with modifiers 54 and 55, and is replaced by 66982 when a case needs extra devices or techniques. Descriptions on this page are Vision Rescue summaries, not the official CPT descriptor.
66984 at a glance
- Global period: 90 days
- Eye modifiers: RT or LT on every line
- Second eye during the global: modifier 79
- Complex version: 66982
- Common diagnoses: ICD-10-CM H25 family
- Premium lens add-ons: V2787 and V2788, not covered by Medicare
66984 or 66982.
The choice follows the work the case required. Medicare contractor policy describes complex surgery as cases that need devices or techniques not used in a standard case.
| Situation | Typical code |
|---|---|
| Standard phaco with IOL, no extra devices | 66984 |
| Small pupil needing iris hooks, a pupil expansion ring, sphincterotomy or synechialysis | 66982 |
| Weak or missing zonular support needing a capsular tension ring, segment or sutures | 66982 |
| Pediatric patients in the amblyogenic age range | 66982 |
| Primary posterior capsulorrhexis | 66982 |
The operative note should name the device or technique and why it was needed, and the pre-op record should show the risk factor, such as a poorly dilating pupil, pseudoexfoliation or phacodonesis. Using a device without a documented need is a common audit finding.
The 90-day global period.
The package runs from the day before surgery through 90 days after, 92 days in total.
Included in the package
- Pre-op visits from the day before surgery
- The surgery and the services that are a normal part of it
- Routine post-op visits and post-op pain management
- Treating complications that do not need a return to the operating room
Billed separately, with a modifier
| Modifier | When it applies |
|---|---|
| 57 | Exam where the decision to operate was made, the day before or day of surgery |
| 24 | Unrelated exam or visit during the global period |
| 78 | Return to the operating room for a related complication |
| 79 | Unrelated procedure during the global, including the second eye |
| 58 | Planned or staged procedure |
Co-management with modifiers 54 and 55.
Both doctors bill 66984 with the same date of service and eye modifier, and each adds a modifier for their part of the care.
How the claims split
The surgeon billing with modifier 54 receives the pre-op and surgical portions. The co-managing doctor billing with modifier 55 receives the post-op portion, prorated by the days of care actually provided. Check the current Medicare fee schedule for the percentages that apply on your claim date.
Documentation both offices need
- A written, dated transfer-of-care agreement kept by both practices
- The patient informed and consenting before the transfer
- The dates care was assumed and relinquished on the claim
- At least one post-op visit by the co-managing doctor before billing
Since 2025, Medicare expects the surgeon to add modifier 54 whenever they do not expect to provide the post-op care, even without a formal written transfer. Add-on code G0559 also lets a clinician outside the surgeon's group bill once for a post-op visit during the global period.
Laterality and the second eye.
- Add RT or LT to every cataract claim line
- Second eye during the first eye's global: 66984 with modifier 79 and the eye modifier
- The second eye starts its own 90-day global period
- Medicare contractors expect separate medical necessity documentation for each eye
Medical necessity and diagnosis codes.
Medicare contractor cataract policies, for example LCD L33954, look for these elements in the record.
- The cataract limits daily activities such as reading, driving or work
- Best-corrected acuity of 20/50 or worse, or a meaningful drop with glare testing
- The patient reports their vision is no longer adequate
- Other eye disease ruled out as the main cause
- Expected improvement, informed consent and a pre-op exam with biometry
| ICD-10-CM | Covers |
|---|---|
| H25.1- | Age-related nuclear cataract, laterality in the code |
| H25.81- | Combined forms of age-related cataract |
| H25.0- | Incipient age-related cataract, by type and eye |
| H26.- | Other cataract types, such as traumatic or drug-induced |
What is bundled into 66984.
Under Medicare's 2026 NCCI policy manual, these are part of the cataract code and are not billed separately.
- An iridectomy needed to complete the surgery, and minor vitreous loss
- Antibiotic, steroid or NSAID injections given during surgery
- The surgeon's own anesthetic blocks and local anesthesia
- Closing the surgical incisions and use of the operating microscope
- Only one code from the cataract family per eye per session
The code itself did not change. Medicare's 2026 fee schedule lowered surgeon payment for cataract surgery through an efficiency adjustment and a cut to facility practice expense, and CMS asked for comments on how 90-day global packages are valued.
From Vision Rescue Pro
Supplies for cataract practices.
Separate from the coding information above. Vision Rescue Pro is a licensed distributor serving cataract surgeons and co-managing optometrists.
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Questions about CPT 66984
What is CPT code 66984?
It is the code for standard cataract removal with an intraocular lens placed in the same session, the most commonly billed cataract surgery code.
What is the global period for 66984?
90 days after surgery, plus the day before and the day of surgery, for 92 days in total.
What is the difference between 66982 and 66984?
66982 is for cases that need extra devices or techniques, such as iris hooks for a small pupil or a capsular tension ring for weak zonules. 66984 is for standard cases.
Is 66984 covered by Medicare?
Yes, when the record documents medical necessity under the Medicare contractor's cataract policy. Premium lens functions billed with V2787 or V2788 are not covered.
What modifier is used for the second eye?
When the second eye is done during the first eye's global period, use modifier 79 with RT or LT.
How is post-op care split with an optometrist?
The surgeon bills 66984 with modifier 54 and the co-managing doctor bills 66984 with modifier 55, with a written transfer of care and the dates on the claim.
Sources
CMS MLN Global Surgery Booklet (MLN907166); Medicare NCCI Policy Manual, Chapter 8, 2026; CGS LCD L33954 and billing article A56453; First Coast Service Options co-management guidance; CMS Ruling 05-01 and CMS-1536-R; CMS femtosecond laser billing clarification, 2012; CMS FAQ on global surgery payment accuracy; AAO and ASCRS coding resources; CMS HCPCS and ICD-10-CM FY2026 code sets.
Notes and disclosures
CPT is a registered trademark of the American Medical Association. Descriptions here are Vision Rescue summaries, not official CPT descriptors. This page is general information for eye care professionals and billing staff, not legal, billing or coding advice. Payer rules vary; verify codes, modifiers and coverage with the current official code sets, your Medicare contractor and the patient's plan. Questions: providers@visionrescue.com or 1-855-692-8024.
Code it right, then equip the case.
Kits, in-office Rx and patient follow-through for cataract practices.