OCT and visual field frequency limits: what SCODI and visual field LCDs actually allow.
Ophthalmic imaging denies overwhelmingly on frequency, not on medical necessity in the abstract — a scheduling habit routinely outruns what the payer's coverage article actually allows. This guide goes deeper than our pillar page on exactly how often OCT (92133/92134) and visual field testing (92081–92083) are separately payable, by clinical picture and by MAC, and what to do before a scan that will exceed the documented interval.
Key takeaways
- 92133 and 92134 can't be reported together, and the frequency cap sits on top of that. Two separate constraints stack on this code pair — a CPT-level "don't report both" instruction and a MAC-level interval limit — and mixing them up is the most common way this denies.
- Six MACs publish six independently-dated SCODI LCDs, and four publish separate visual field LCDs. There is no single national frequency number for either test — this guide names the actual document IDs by contractor.
- Retinal OCT under active anti-VEGF treatment and optic-nerve OCT for stable glaucoma run on entirely different clocks. Scheduling both off the same interval is a routine, avoidable source of CO-151.
- A signed ABN before the scan, not an appeal after the denial, is the only thing that shifts the cost to the patient. Backdating one, or drafting a generic waiver, doesn't hold up.
Why frequency, not medical necessity, drives most imaging denials here
A diagnosis that clearly supports OCT or visual field testing in the abstract still denies if the claim lands before the payer's documented interval has elapsed for that clinical picture. CO-151 (payment adjusted because the payer deems the information submitted does not support this many services) is the CARC that fires, and it fires whether or not the repeat scan was clinically reasonable, because the adjudication system checks the calendar against the LCD before it checks anything else.
The failure mode is structural, not clinical: practices build imaging into a fixed recall schedule — every visit, every three months, whatever the EHR template defaults to — instead of tracking the specific interval tied to the specific diagnosis and treatment status. A retina practice running monthly anti-VEGF visits and scanning at every one of them is usually fine on 92134; a glaucoma practice doing the same thing with 92133 on a stable patient is very often not.
SCODI (92133/92134): the coding rule underneath the frequency cap
92133 reports scanning computerized ophthalmic diagnostic imaging of the posterior segment, optic nerve; 92134 reports the same SCODI technology applied to the retina. CPT's own coding guidance instructs against reporting both codes together for the same patient on the same date — this is not a payer-configurable bundling edit with a modifier override, it's an instructional restriction because the two codes represent alternative uses of one imaging technology for different clinical targets, not two separately performed studies. Choose the code that matches what was actually clinically indicated: 92133 for glaucoma and optic neuropathy management, 92134 for retinal disease — AMD, diabetic macular edema, retinal vein occlusion, and anything under active anti-VEGF treatment.
On top of that CPT-level restriction sits a second, independent constraint: the MAC's own frequency limit on how often either code is separately payable at all, regardless of which one is billed. Both constraints have to be satisfied — picking the right code doesn't help if the interval hasn't elapsed, and waiting out the interval doesn't help if the wrong code was picked.
| MAC | Document | Effective date | Last updated |
|---|---|---|---|
| CGS Administrators | L34061 | 08/06/2026 | 07/27/2026 |
| Wellpoint Federal | L34380 | 04/01/2026 | 07/14/2026 |
| WPS Insurance Corporation | L34760 | 06/26/2025 | 06/17/2025 |
| First Coast Service Options | L33751 | 11/28/2019 | 01/28/2022 |
| Novitas Solutions | L35038 | 10/31/2019 | 12/10/2021 |
| Palmetto GBA | L34431 | 08/12/2021 | 08/02/2021 |
Document IDs, contractor names, and effective/updated dates above were confirmed live against the CMS Coverage Database for this build. Find your practice's specific MAC jurisdiction, then pull that MAC's article for the exact interval-in-days language and covered-diagnosis list — don't schedule off a competitor's summary or a different jurisdiction's number.
How often OCT is actually payable, by clinical picture
The interval that matters is tied to disease activity and treatment status, not to the code alone. Retinal OCT (92134) under active anti-VEGF therapy for wet AMD, diabetic macular edema, or retinal vein occlusion runs on the shortest clock; optic-nerve OCT (92133) for glaucoma management runs on a materially longer one, and more frequent testing there is supportable only where the record documents a specific reason — a medication change, a new exam finding, or documented progression risk the note ties directly to the decision to repeat the scan sooner. A stable, longstanding mild glaucoma patient scanned every visit on the standard three-month recall schedule is the single most common OCT frequency denial pattern in a general ophthalmology practice, because the chart doesn't support a repeat that often.
| Clinical picture | SCODI code | Typical interval reported in current sourcing |
|---|---|---|
| Active anti-VEGF treatment (wet AMD, DME, RVO) | 92134 | Up to about monthly |
| Stable retinal disease, injections spaced out | 92134 | About every two months or less often |
| Stable, low-risk glaucoma or optic neuropathy | 92133 | About one to two times a year |
| Glaucoma with a documented new finding or progression risk | 92133 | Shorter interval, only with a specific reason stated in the note |
⚠️ These intervals reflect current billing-industry and coding-newsletter sourcing rather than the exact day-count language of any single MAC's LCD, because CMS's own coverage-database article pages returned access errors to automated retrieval during this build. Pull the specific interval language from your MAC's SCODI LCD before coding a scrubber rule or a recall-schedule default against it — the numbers above are directionally reliable, not a substitute for the primary document.
Visual field frequency (92081–92083)
92081 (limited exam — a screening test of a few isopters or spot-check points), 92082 (intermediate exam — at least two isopters on Goldmann perimetry or an equivalent semiquantitative automated program), and 92083 (extended exam — full threshold perimetry such as Humphrey 24-2 or 30-2, or Goldmann with three or more isopters) are billed by the test actually performed, not stacked within the same encounter. Frequency for all three follows the underlying disease's stability and progression risk, most often glaucoma staging: early, stable disease supports the widest interval, and each step up in severity or documented progression risk supports testing sooner, provided the note states the specific reason.
| MAC | Document | Effective date | Last updated |
|---|---|---|---|
| CGS Administrators | L34394 | 10/02/2025 | 09/26/2025 |
| Wellpoint Federal | L33574 | 04/01/2026 | 07/14/2026 |
| WPS Insurance Corporation | L34615 | 05/29/2025 | 05/20/2025 |
| First Coast Service Options | L33766 | 01/08/2019 | 11/21/2019 |
⚠️ Document IDs, contractor names, and effective/updated dates above were confirmed live against the CMS Coverage Database. The specific frequency-by-stage table inside each article — how many visual fields a year a mild-, moderate-, or severe-stage glaucoma diagnosis supports — was not independently re-verified line by line against the primary article text during this build (CMS's article detail pages returned access errors to automated retrieval), so pull the specific table for your MAC before finalizing a recall protocol against it.
Diagnosis specificity does real work here. H40.9 (unspecified glaucoma) gives an adjudicator nothing to check a frequency claim against; the specific laterality-and-stage code — H40.1111, primary open-angle glaucoma, right eye, mild stage (ICD-10-CM FY2026, verified billable) — ties the repeat test to a documented severity level the LCD's frequency table is actually written against. Same logic on the retinal side: H35.9 (unspecified retinal disorder) versus H35.3211, exudative AMD, right eye, with active choroidal neovascularization, or E11.3211, type 2 diabetes with mild nonproliferative retinopathy and macular edema, right eye (both ICD-10-CM FY2026, verified billable). An unspecified code frequently fails a frequency review where the specific one would pass.
Get the ABN signed before a scan you expect to exceed the documented interval, not after the claim denies. Name the actual reason in the reason box — "OCT performed sooner than the payer's documented frequency interval allows" — rather than a generic waiver. A blanket ABN on file, or one signed retroactively once a denial arrives, doesn't shift financial responsibility to the patient; it just documents that the practice knew the claim wouldn't pay and billed the patient anyway without proper notice.
Do and don't
- Choose 92133 or 92134 based on the clinical target (optic nerve versus retina), never both for the same date.
- Confirm your specific MAC's SCODI and visual field LCD before scheduling a repeat scan.
- Code to the specific, staged, laterality-coded diagnosis so the claim matches what the LCD's frequency table is written against.
- Get a signed ABN, with the frequency reason named, before performing a scan expected to exceed the documented interval.
- Don't bill 92133 and 92134 together — it's a CPT instruction, not a modifier-bypassable edit.
- Don't schedule optic-nerve OCT for stable glaucoma on the same interval as retinal OCT for active anti-VEGF treatment.
- Don't code an unspecified diagnosis when the chart supports a specific, staged, laterality-coded one.
- Don't sign or backdate an ABN after the claim has already denied.
Writing off OCT or visual field CO-151 denials in your ophthalmology practice?
We'll audit a sample of your recent imaging claims against your specific MAC's SCODI and visual field intervals, and show what's genuinely recoverable versus what needed an ABN that wasn't there.
Frequently asked questions
How often will Medicare pay for OCT (92133) on a patient getting monthly anti-VEGF injections?
Most SCODI LCDs treat active anti-VEGF treatment as the scenario justifying the shortest interval — commonly described in current billing-industry sourcing as up to once a month, stepping down to roughly every two months once the retina stabilizes and injections space out. That interval applies to 92134 (retina), not 92133 (optic nerve) — the two codes are scored against different disease pictures, and pulling 92133 into a monthly anti-VEGF schedule instead of 92134 is a frequency-and-medical-necessity mismatch on top of the wrong code. Confirm the exact interval in your MAC's specific SCODI LCD before building the monthly scan into a standing order.
Can we bill 92133 and 92134 on the same date if we're checking both the optic nerve and the retina?
No — this isn't a frequency limit, it's a CPT coding instruction that sits above any payer edit. 92133 and 92134 represent alternative applications of the same SCODI technology, and CPT guidance is not to report both for the same patient on the same date regardless of how many structures were imaged or how well documented the medical necessity is for each. If a patient genuinely needs both, prioritize clinically to one code per date, or perform them on different dates — no modifier overrides this restriction.
What happens if we scan before the LCD's frequency interval has elapsed — do we just eat the cost, or can we bill the patient?
You can shift the cost to the patient, but only if the paperwork happened first. Get a signed Advance Beneficiary Notice before performing a study you expect to fall outside the documented interval without new clinical justification — that converts a scan Medicare won't pay into a patient-responsibility charge instead of a write-off after the fact. An ABN signed after the claim already denied, or backdated, doesn't protect the practice; the notice has to precede the service, with the reason box naming the actual frequency issue, not a generic waiver statement.
Verify before billing. CPT is a registered trademark of the American Medical Association; codes here are paraphrased, not reproduced from the CPT Professional edition. CPT, HCPCS and ICD-10 codes, coverage policy, and bundling edits change, including annual code-set updates. This page reflects standard industry practice and is provided for general education — it is not a substitute for your own compliance review, your current payer contracts, or the current-year code sets. Confirm requirements against your specific payer mix before submitting claims.