OCT billing guidelines 92134 and 92133 come down to one choice per visit: image the optic nerve (92133) or the retina (92134), never both on the same day. Either code is billed once, with one unit, whether one eye or both are scanned.
Visual fields (92083) can join either OCT code on the same day when each test answers its own clinical question. Fundus photography (92250) is different, because NCCI treats it as mutually exclusive with posterior segment OCT.
Frequency then decides whether the scan pays. Medicare contractors generally allow optic nerve OCT up to twice a year, while retinal OCT can run every two months, or monthly during active treatment.
Optic Nerve or Retina: Picking the OCT Code
Medicare groups OCT under SCODI, or scanning computerized ophthalmic diagnostic imaging, and the structure scanned decides the code. Use CPT 92133 for the optic nerve, as in glaucoma, and CPT 92134 for the retina, as in macular degeneration or diabetic macular edema.
Anterior segment imaging, such as an angle check, has its own code, 92132. With both glaucoma and retinal disease, code the main reason for that day’s scan.
OCT angiography (92137) is not billed with 92133 or 92134. Our broader ophthalmology billing guide shows where these codes fit among other eye services.
One Line, One Unit, Either Eye
Under OCT billing guidelines 92134 and 92133 are both described as unilateral or bilateral. The payment is the same whether one eye or both are scanned.
That means no modifier 50, RT, LT or 52. The AAO Savvy Coder guidance is clear that OCT is billed as a single line with one unit.
Splitting one scan into two lines, one per eye, is a common source of duplicate-line denials. Visual fields (92083) follow the same one-unit approach. Even so, the note should explain why each eye was scanned. LCDs expect medical need documented for every eye included in a bilateral study.
Structure and Function on the Same Visit
Glaucoma care often pairs a 92083 visual field with optic nerve OCT to track both function and structure.
NCCI lists no edit between 92083 and 92133, so both can be billed on the same date without modifier 59, as AAPC’s coding alert confirms. Each still needs its own necessity and interpretation.
A typical glaucoma follow-up claim looks like this:
- A 92083 field checks for functional loss.
- A 92133 scan measures the nerve fiber layer.
- Each test gets its own interpretation and H40 diagnosis link.
- Both lines go out with no modifier.
The same applies to a field plus a 92134 scan for hydroxychloroquine monitoring.
Some payers discourage every test at every visit, so space tests by disease severity, as covered in our cataract and glaucoma coding guide.
Under OCT billing guidelines 92134 and 92133 each count toward their own frequency limit, separate from the visual field.
Imaging Pairs That Trigger NCCI Denials
A few same-day combinations account for most OCT edit denials. Here is how the common pairs work:
| Same-day pair | Billable? | Note |
|---|---|---|
| 92133 + 92134 | No | Mutually exclusive |
| 92133 or 92134 + 92250 | Rarely | Both must be necessary |
| 92137 + 92133 or 92134 | No | OCTA replaces OCT |
| 92133 or 92134 + 92083 | Yes | Separate necessity |
92250 fundus photography bundling is the pair that trips up most practices. The First Coast SCODI LCD says posterior OCT and fundus photos of the same eye on the same day are generally mutually exclusive.
Both can be billed only when each was needed, and the record must say why. Frequent pairing may lead to focused medical review. When a modifier is justified, it goes on 92250, not the OCT line. Use it sparingly, since routine overrides attract audits.
Diagnoses That Carry Medical Necessity
MACs list the covered ICD-10 codes in their SCODI billing articles. These five indications cover most OCT claims.
Glaucoma and Glaucoma Suspects
Optic nerve OCT pairs with H40.0- for suspects and H40.1- for open-angle glaucoma. Primary open-angle glaucoma codes need a seventh character for stage, and missing it can stall the claim.
Wet AMD and Diabetic Macular Edema
Retinal OCT supports exudative AMD (H35.32-) and diabetic retinopathy with macular edema, such as E11.311. These patients often need scans during active injection treatment.
Vein Occlusions and Detachments
Retinal vein occlusions (H34.8-) and retinal detachments also support 92134. Laterality matters here, as our post on retinal detachment ICD-10 codes explains.
Patients on Hydroxychloroquine
Hydroxychloroquine screening for retinal toxicity is a covered use, unlike general screening. Document the drug and the condition it treats, often with Z79.899 for long-term drug therapy, and check your MAC’s required pairing.
Optic Nerve Disease Beyond Glaucoma
Optic neuritis (H46-) and papilledema (H47.1-) can support 92133. The note should tie the scan to the suspected or known optic nerve condition, not a routine exam.
How Often Payers Will Pay for a Scan
OCT frequency limits come from each contractor’s SCODI LCD (e.g. FCSO L33751; IDs vary by MAC) and its billing article. The First Coast limits below are typical:
| Indication | Code | Usual limit |
|---|---|---|
| Glaucoma or suspect | 92133 | 2 per year |
| Stable retinal disease | 92134 | 1 every 2 months |
| Active retinal treatment | 92134 | 1 per month |
| HCQ or CQ monitoring | 92134 | 1 per year |
| Anterior segment | 92132 | 2 per year |
The CGS SCODI article A56692 uses similar language, adding that optic nerve OCT is rarely needed once damage is advanced. With OCT billing guidelines 92134 limits apply per eye in some articles, so a monthly scan of one eye does not use up the other eye’s allowance.
Commercial plans may mirror these limits or set their own. Confirm the current LCD revision in the CMS coverage database and each plan’s policy before scheduling repeat scans.
What Auditors Look for in the OCT Report
Both OCT codes include interpretation and report. Without a written interpretation, the code is not supported, even if the scan was taken.
Why Was the Scan Ordered?
The report should open with why the scan was needed, such as monitoring glaucoma or checking for fluid during treatment. This links the test to a covered diagnosis.
What Did Each Eye Show?
Record findings separately for each eye, such as nerve fiber layer thinning or central thickness. LCDs expect medical need for every eye imaged.
Has Anything Changed Since the Last Scan?
Auditors look for change over time. A line noting whether results are stable, improved or worse shows the scan served a monitoring purpose.
What Happens Next for the Patient?
State how the result shaped the next step, such as continuing drops or giving another injection. This is what turns an image into a medically necessary test.
Is the Report Signed and Saved?
The interpreting provider must sign and date the report, and the scan data should be stored for later comparison. Our optometry coding cheat sheet lists other testing codes that follow the same report rules.
OCT Scans That Support Both Patient Care and Payment
For patients with glaucoma or retinal disease, regular OCT is how vision loss gets caught early. Every denied scan puts pressure on that schedule. Three questions keep each claim on track: Which structure was imaged? Does the diagnosis and timing fit the payer’s limit? Does the report show how the result guided care?
Answering them at every visit turns OCT billing guidelines 92134 and 92133 into a routine rather than a risk. Build that habit into every imaging day, and lean on MBW RCM for ophthalmology billing support as volume grows.
OCT Billing Guidelines 92134 FAQs
Can 92133 and 92134 be billed on the same day?
No. The codes are mutually exclusive, so choose the one that matches the main reason for that day’s scan.
Should OCT be billed with RT, LT or modifier 50?
No. Both codes are unilateral or bilateral, so bill one line with one unit for one or both eyes.
Can visual fields and OCT be billed together?
Yes, when each test is medically necessary and has its own interpretation. This is common in glaucoma management.
How often can retinal OCT be billed during injections?
Many MACs allow up to one 92134 scan per month per eye during active treatment for conditions such as wet AMD or macular edema.
Is OCT covered for hydroxychloroquine patients?
Yes, as toxicity monitoring. Under OCT billing guidelines 92134 for hydroxychloroquine is usually limited to once a year, with the drug and condition documented.