HCPCS code V2118 – Aniseikonic single-vision lens

Key takeaways

HCPCS Code V2118 describes an aniseikonic single-vision spectacle lens, which corrects a difference in image size between the two eyes.

Medicare’s DME MAC policy treats V2118 as a lens add-on, billed beside the base single-vision lens code for the same eye.

Bill one unit per lens with RT or LT, and put a bilateral pair on two separate claim lines.

Original Medicare pays only for aphakia, congenital aphakia or pseudophakia, so aniseikonia alone does not qualify.

V2118 has never been a contact lens code, since contact lenses take codes from the V2500-V2599 range.

HCPCS Code V2118: Official descriptor and scope

HCPCS Code V2118 is the CMS HCPCS Level II code for an aniseikonic single-vision spectacle lens. The long descriptor reads “Aniseikonic lens, single vision,” and each unit is one lens.

The code sits in the V2100-V2199 single-vision lens range of the HCPCS Level II codes. It describes the lens design, so the sphere and cylinder powers on the prescription do not decide it.

On a Medicare claim, V2118 does not stand alone. The DME MAC policy article A52499 lists it among the add-on features of lenses. These are billed in addition to the code for the basic lens.

What an aniseikonic lens does

Aniseikonia is a difference in the size or shape of the image each eye perceives. Patients report eyestrain, headaches, double vision or poor depth perception. It often follows anisometropia, a large difference in prescription between the eyes.

Every spectacle lens magnifies or shrinks the image slightly as it corrects focus. An aniseikonic lens, also called an iseikonic or size lens, controls that effect. The lab adjusts factors such as base curve, center thickness and vertex distance until the two images match more closely.

These lenses are custom-made and uncommon. A typical case is a patient whose cataract surgery on one eye leaves the two eyes with unequal image sizes. V2118 applies when that patient wears a single-vision lens.

What V2118 covers and what it does not

V2118 reports the aniseikonic design on one single-vision lens. The base lens, the frame and most lens options carry their own codes.

• Covered by V2118: the size-correcting design on one single-vision spectacle lens, for either eye, with RT or LT showing which lens is billed.
• Base lens power: billed with a sphere or spherocylinder code from V2100-V2114, or V2199 when no specific code fits.
• Bifocal or trifocal aniseikonic lenses: bill V2218 for a bifocal and V2318 for a trifocal.
• Lenticular lenses: bill V2115 for a myodisc design and V2121 for other single-vision lenticular lenses.
• Contact lenses: these take codes from the V2500-V2599 range, never V2118.
• Frames and lens options: bill V2020 for a standard frame, and use the matching V27xx code for tints, coatings or material upgrades.

How V2118 differs from its neighboring lens codes

The single-vision range splits by lens type before power. Two codes in the middle of the range, V2116 and V2117, were deleted at the end of 2003. Any reference that still lists them is out of date.

V2218 and V2318 are the closest near misses, because they share the aniseikonic design. Read the segment count on the lab order first. A single-vision order means V2118.

Medicare coverage rules for V2118

Original Medicare covers V2118 only when the lens restores vision after the natural lens is missing. The DME MAC Refractive Lenses LCD (L33793) and its policy article set the rules. Refractive lenses fall under the prosthetic devices benefit, Social Security Act §1861(s)(8).

• Covered diagnoses: pseudophakia, aphakia and congenital aphakia. Lenses provided for other diagnoses are denied as noncovered.
• Pseudophakia limit: coverage is one pair of eyeglasses or contact lenses after each cataract surgery with an intraocular lens (IOL).
• Replacements: replacement lenses are noncovered for pseudophakic patients, but covered for aphakic patients when medically necessary.
• Add-on rule: there is no coverage for lens add-on codes unless there is a covered lens, so V2118 rides on a covered base lens.
• Surgery before Medicare: lenses are still covered when the natural lens was removed before Medicare entitlement.

A V2118 lens for a patient with neither aphakia nor pseudophakia is outside the benefit. Claims go to the DME MAC, not the Part B MAC, and are priced from the DMEPOS fee schedule.

Medicare Advantage plans must offer the same post-cataract benefit, and many add a routine eyewear allowance. Medicaid vision benefits differ by state, and specialty lenses often need prior approval there.

Documentation requirements for V2118

Each V2118 claim needs a complete record before it goes out. Good records also hold up in the medical billing compliance checks payers run after payment.

• Standard Written Order: L33793 requires the supplier to receive a completed order before submitting the claim. Without one, the claim is denied.
• Prescription: sphere, cylinder and axis for each eye, dated and signed by the prescriber.
• Aniseikonia finding: the measured or calculated image-size difference and the symptoms it causes.
• Lab order: confirmation that each lens is an aniseikonic single-vision design.
• Surgical history for Medicare: the cataract surgery date and whether an IOL was implanted.
• Diagnosis on the claim: A52499 requires the diagnosis code that justifies the lens to appear on the claim.
• Proof of delivery: the date the patient received the lenses.

ICD-10 diagnosis codes commonly paired with V2118

The diagnosis on a V2118 claim should explain why the patient needs a size-correcting lens. On a Medicare claim it must also show a covered lens status.

Aniseikonia alone does not meet the Medicare criteria. Pair H52.32 with Z96.1, an aphakia code or Q12.3 where the record supports it.

Modifiers used with V2118

A52499 requires RT or LT on every lens code in the policy, V2118 included. When the same code is billed for both eyes, each lens goes on its own line with one unit.

Never bill RTLT on one line with two units. Medicare rejects that line as incorrect coding. The KX, GA and GZ rules in A52499 apply to coatings, tints, oversized lenses and polycarbonate, not to V2118.

How to bill V2118 correctly

Build the claim from the lab order and the dispensing record. Two checks come first. The record must show a covered lens status, and the lab order must show how many segments the lens has.

Once both checks pass, a Medicare claim for a pair of aniseikonic single-vision lenses in a standard frame looks like this.

1. Base lens, right: the V2100-V2114 code that matches the right lens power, with RT and one unit.
2. V2118-RT, one unit: the aniseikonic design on the right lens.
3. Base lens, left: the matching V2100-V2114 code with LT and one unit.
4. V2118-LT, one unit: the aniseikonic design on the left lens.
5. V2020, one unit: the standard frame, with no RT or LT modifier.
6. Diagnosis pointers: link each line to the covered lens status and to H52.32.

Commercial, Medicaid and vision plans set their own rules for specialty lenses. Some may expect a different claim structure or prior approval, so check the plan before the lab starts work.

Common reasons V2118 claims are denied

Most V2118 denials trace back to a short list of avoidable errors. Tracking them through denial management in healthcare shows which one costs your practice the most.

• V2118 billed alone: Medicare does not cover a lens add-on without a covered base lens on the claim.
• Missing or combined modifiers: no RT or LT, or RTLT with two units, is rejected as incorrect coding.
• Diagnosis outside the benefit: aniseikonia or anisometropia without aphakia or pseudophakia is denied as noncovered.
• Benefit already used: a pseudophakic patient already had the one pair allowed after that surgery.
• No written order: the supplier billed before receiving a completed Standard Written Order.
• Wrong segment code: a bifocal or trifocal aniseikonic lens billed as V2118 instead of V2218 or V2318.
• Contact lens billed as V2118: contact lenses belong in V2500-V2599.

Each of these is cheaper to stop before submission than to appeal. A clean claim review covering the base lens line, laterality and the diagnosis link catches most of them.

Reimbursement for V2118

Medicare pays V2118 from the CMS DMEPOS fee schedule, not the Physician Fee Schedule. Its pricing indicator, 38, places it with prosthetics and vision services, priced within floors and ceilings.

Allowed amounts vary by state and change each January, so check the current-year file before quoting a patient. Once the Part B deductible is met, the patient pays 20% coinsurance on the approved amount. Outside Medicare, the vision plan, Medicaid program or commercial payer sets its own allowance.

How Pabau keeps V2118 lens claims clean

The facts that decide a V2118 claim sit in different places. The image-size finding is in the exam notes, the lens design is on the lab order, and the surgical history is in the chart.

Pabau, the practice management and billing platform we build, keeps the prescription, the exam notes and the claim on one patient record. The biller can confirm the order says aniseikonic and single vision before pairing V2118 with its base lens line.

Before a claim goes out, Pabau’s claims management software checks that details insurers need, such as member IDs and authorization codes, are in place. In the US, claims are sent through Claim.MD, with claim status tracked in one dashboard.

Fewer lens claims come back for a missing base line or modifier. Your team fixes the claim in the queue, which costs far less than working a denial.

Bill vision supply claims without the rework

Pabau keeps the prescription, lens order and claim on one patient record, and tracks every V-code claim from submission to payment.

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Conclusion

Code V2118 from the lab order and the base lens from the prescription. The order has to read aniseikonic and single vision before V2118 goes on the claim.

Settle Medicare coverage before the lab starts work. The patient must be aphakic or pseudophakic, and a pseudophakic patient gets one pair per surgery. Where neither applies, add GY and agree the cost with the patient before the lens is made.

Book a demo to see how Pabau keeps lens orders and V-code claims on one record for your optometry practice.

Continue your research

Want to understand what makes a claim clean before it reaches the payer? Submitting a clean claim explains the field-level requirements that prevent automatic edits and rejections at the clearinghouse.

Coding the frame on the same claim? HCPCS Code V2020 explains the standard frame code that sits beside the lens lines.

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