CPT® Code 92134

Quick Reference

• Code definition: Reports computerized ophthalmic diagnostic imaging (OCT) of the posterior segment focused on the retina, including image acquisition, physician interpretation, and a written report, for one or both eyes in a single unit of service.
• Key billing rule: One unit of service covers both eyes. The descriptor reads "unilateral or bilateral" and the bilateral surgery indicator confirms the 150% payment adjustment does not apply. Never append modifier -50 or bill two units [1].
• Modifier essentials: Modifiers -26 and -TC apply (PC/TC indicator = 1). In a physician office, bill the global code with no modifier. In a hospital outpatient department, the physician bills -26 and the facility bills -TC. Append -RT or -LT when only one eye is imaged. Use -59 when billing 92133 and 92134 on the same date to bypass the NCCI edit [3].
• Documentation must-have: A signed, dated written interpretation by the interpreting physician, separate from the device-generated scan printout, with quantitative retinal measurements, comparison to prior study, clinical impression, and a statement of management impact.
• Top confusion point: Do not use 92134 when OCT angiography (OCT-A) is performed. CPT 92137, added January 1, 2025, is the correct code for retinal OCT with angiography. Reporting 92134 when angiography was performed is undercoding; billing 92134 and 92137 together for the same eye is unbundling [1].
• 2025 descriptor change: The phrase "retinal thickness analysis" was removed from the descriptor effective January 1, 2025. The code now reads simply "posterior segment...retina." Update documentation templates, superbills, and coding policies accordingly [1].
• Payer alert: No National Coverage Determination (NCD) exists for 92134. Coverage is governed by MAC-level Local Coverage Determinations (LCDs). Frequency limits and covered diagnoses vary by jurisdiction; verify the applicable LCD before coding.

When to Use This Code

92134 reports retinal OCT of the posterior segment when the clinical focus is the retina rather than the optic nerve. Use it when the study generates retinal layer morphology and thickness data for any of the following conditions: diabetic macular edema (DME) including baseline and serial surveillance during anti-VEGF therapy; age-related macular degeneration (AMD), both nonexudative and exudative, including pre- and post-treatment monitoring; macular hole and epiretinal membrane evaluation; vitreomacular traction; central serous chorioretinopathy; retinal vein or artery occlusion with macular involvement; choroidal neovascularization; retinal detachment and breaks; and inherited retinal dystrophies such as Stargardt disease and retinitis pigmentosa.

The study may be performed on one or both eyes in a single encounter; one unit of service covers both. Spectral-domain OCT (SD-OCT) and swept-source OCT (SS-OCT) both qualify. The code does not restrict by device type or manufacturer.

Scope boundaries: 92134 covers the retina. Optic nerve head and retinal nerve fiber layer (RNFL) analysis for glaucoma monitoring is 92133. Anterior segment imaging (cornea, iris, lens, anterior chamber angle) is 92132. OCT combined with angiographic flow mapping is 92137, a code that replaced the unlisted-code workaround for OCT-A as of January 1, 2025 [1].

Setting: 92134 is billable in any setting where the study is performed, including private ophthalmology offices, hospital outpatient departments, and ambulatory surgery centers. The applicable modifier and payment rate differ by setting, and the APC packaging rules affect hospital outpatient facility payment.

Code Differentiation Table

The critical differentiator between 92134 and 92137 is the presence of angiographic flow mapping. If the OCT device generates images documenting retinal vasculature perfusion patterns, report 92137 exclusively [1]. Billing 92134 in that scenario is undercoding; billing both codes for the same eye is unbundling.

Billing & Modifier Rules

Modifiers -26 and -TC

92134 carries PC/TC indicator 1 ("Diagnostic Tests for Radiology Services"), making the professional and technical components separately reportable [2]. Apply as follows:

• Private physician office: Bill the global code with no modifier. The practice owns the equipment and the physician performs the interpretation.
• Hospital outpatient department: The physician bills 92134-26 (interpretation only). The facility bills 92134-TC. The TC carries APC status of STV-Packaged, meaning it may be bundled into the facility APC payment when performed alongside a significant procedure. The physician's -26 is always payable separately.
• Purchased interpretation: If a physician reads images generated at another facility, bill 92134-26 only.

Modifier -50 (Bilateral): Do not use

The descriptor specifies "unilateral or bilateral" and the bilateral surgery indicator is coded 2, confirming no additional payment for the second eye [1]. Appending -50 or billing two units on the same date triggers an overpayment demand or denial.

Modifiers -RT and -LT

Append -RT or -LT when only one eye is imaged, to document laterality. Payment remains identical to bilateral. Some MACs require laterality modifiers for claims processing; verify with the applicable contractor.

Modifier -59 with 92133

An NCCI column 1/column 2 edit exists between 92133 and 92134 [3]. When both codes are billed on the same date, append -59 (or -XS for separate anatomic structure) to the lower-valued code. Both services must be clinically distinct, with separate written reports supporting each study. Modifier -59 without the dual-report documentation will not survive a post-payment audit.

Multiple Procedure TC Reduction (Multiple Procedures Indicator 7)

When multiple ophthalmic diagnostic imaging codes are billed on the same date (such as 92133 + 92134, or 92134 + 92250), CMS applies a payment reduction to the technical component of the lower-valued code. This is a specialty-specific reduction distinct from the standard 50% multiple procedure adjustment [2].

MUE = 1

The medically unlikely edit for 92134 is 1 unit per date of service [4]. One unit is the maximum payable, covering one or both eyes in a single encounter.

Documentation Essentials

The medical record must support both the technical acquisition and the physician interpretation as distinct, documented acts. An OCT device printout or a technician's scan acquisition note does not satisfy the interpretation requirement. This distinction is the most common trigger for post-payment audit recoupment in ophthalmic imaging.

Required elements:

• Physician order with clinical indication linked to a covered diagnosis
• ICD-10-CM code(s) from the applicable MAC LCD covered diagnosis list, establishing medical necessity for the specific encounter
• Laterality (which eye or both eyes imaged, documented within the interpretation)
• Written interpretation and report, signed and dated by the interpreting physician, containing: retinal layer morphology findings with quantitative thickness measurements; comparison to prior study or normative database; clinical impression correlated to the patient's diagnosis; and a statement of management impact (treatment modification, continued surveillance, or referral decision)
• OCT device type and scan protocol used
• Separate written report for each code when 92133 and 92134 are both billed on the same date

Audit red flags specific to 92134:

• Device-generated scan report submitted as the physician interpretation. OIG audits of ophthalmic imaging practices have specifically identified substitution of automated device reports for physician interpretation as a basis for recoupment [5].
• Documentation templates referencing "retinal thickness analysis." The 2025 descriptor revision removed this language; outdated templates may create inconsistency that auditors flag [1].
• Bilateral billing when only one eye has a documented covered diagnosis.
• OCT frequency exceeding LCD limits without contemporaneous chart documentation of clinical justification.
• Screening language in the order or report (such as "routine baseline OCT") without a covered ICD-10-CM diagnosis in the record.

Medicare, Commercial & Medicaid Payer Rules

Medicare

No NCD governs CPT 92134. Coverage is determined by MAC-level LCDs. Representative covered conditions include diabetic retinopathy with macular involvement (E08 to E13 series with .3x complications), AMD (H35.31x, H35.32x), macular edema (H35.81x), central serous chorioretinopathy (H35.71x), epiretinal membrane (H35.37x), macular hole (H35.34x), retinal vein occlusion with macular involvement (H34.8x), choroidal neovascularization (H35.33x), and retinal detachment (H33.x). Verify the active LCD for your MAC jurisdiction at the CMS Medicare Coverage Database before coding [6].

Most MACs allow up to 2 studies per eye per year for stable monitored conditions and up to 4 per eye per year for actively treated conditions (such as anti-VEGF therapy for wet AMD or DME). Studies beyond these thresholds require documented clinical justification in the chart; unsupported frequency is a primary audit target.

CY 2025 Medicare non-facility (office) payment for 92134 is approximately $67 to $80, based on total RVUs of approximately 2.09 (work RVU approximately 0.89, non-facility PE approximately 1.14, malpractice approximately 0.06). Verify the exact rate at the CMS Physician Fee Schedule lookup tool [2].

OIG Work Plan priorities have included ophthalmic imaging services. Documented audit focus areas include medically unnecessary OCT, bilateral billing without dual-eye documentation, frequency abuse, and absence of physician interpretation. Practices with high OCT volume should conduct periodic internal audits aligned with OIG compliance guidance [5].

Commercial Payers

Most commercial payers follow Medicare's medical necessity framework for 92134, but prior authorization requirements vary by plan and frequency threshold. Some payers require authorization for OCT billed beyond a set number of services per year or when billed same-day with other imaging codes. Verify payer-specific policies at the point of scheduling for high-frequency retinal monitoring patients.

Commercial payers may not have updated their claim editing systems to reflect the 2025 descriptor revision. If a claim denies citing a descriptor mismatch, submit the updated AMA CPT 2025 descriptor with the appeal documentation.

Medicaid

Medicaid coverage for 92134 varies significantly by state and managed Medicaid plan. Some state programs restrict coverage to specific diagnoses or require prior authorization for retinal imaging beyond a defined annual frequency. Confirm state-specific rules and any applicable treatment authorization request requirements before coding retinal OCT for Medicaid beneficiaries.

Common Denials & Prevention

Bundled/Denied: Missing modifier when billed with 92133

The NCCI PTP edit between 92133 and 92134 causes the second code to bundle and deny without modifier -59 [3]. The fix is appending -59 to the lower-valued code at the time of billing. Prevention requires both a modifier on the claim and two separate written reports in the chart; the modifier alone will not withstand audit scrutiny without the dual-report documentation.

Medically Unnecessary: No covered diagnosis

The claim lacks an ICD-10-CM code from the applicable MAC LCD covered diagnosis list, or the order references screening without a documented pathology. Every 92134 claim requires a diagnosis code that maps to a covered indication. Build order-entry workflows that require selection of a covered diagnosis before an OCT is scheduled. For practices billing across multiple MAC jurisdictions, maintain current LCD references for each contractor.

Frequency Exceeded

The number of 92134 services billed exceeds the LCD frequency limit for the documented condition. Resolution requires chart documentation of clinical justification for the additional study, submitted with the appeal. Prevention requires tracking OCT frequency per eye per patient during scheduling and flagging encounters approaching LCD limits for physician review before the order is placed.

Insufficient Documentation: Missing physician interpretation

The claim denies or is recouped because the physician interpretation is absent or relies solely on the device-generated report. Implement a pre-billing checklist that requires confirmation of a signed, dated physician interpretation note before 92134 is billed. The interpretation must be separate from the technician's acquisition note and must address findings, measurements, comparison to prior, and management plan.

Incorrect Bilateral Billing: Modifier -50 or two units

Claims submitted with -50 or two units of 92134 on the same date deny or generate an overpayment demand. Remove modifier -50 from claim templates and coding workflows. If a claim was submitted incorrectly, file a corrected claim with a single unit and no -50, and submit a voluntary refund for any overpayment.

Coding Scenarios

Scenario 1 (AMD monitoring, bilateral, office setting): A retinal specialist sees a 74-year-old Medicare patient with nonexudative AMD in both eyes at a 6-month surveillance visit. Retinal OCT of both eyes is performed. The physician dictates a signed written interpretation documenting stable macular architecture bilaterally, no drusenoid progression, and no conversion to exudative AMD. The report references prior measurements.

Correct coding: 92134 (one unit, no modifier) + H35.31 (nonexudative AMD, right eye) and applicable left-eye code

Why: One unit covers bilateral imaging. Modifier -50 is not used; the descriptor already includes bilateral. A distinct physician interpretation, not the device printout, is required for payment.

Scenario 2 (Retinal OCT and optic nerve OCT same day, DME and glaucoma): An ophthalmologist sees a patient with both confirmed diabetic macular edema and primary open-angle glaucoma at a comprehensive follow-up. The physician performs retinal OCT for DME monitoring and optic nerve OCT for RNFL glaucoma monitoring, generating two separate written reports addressing each study independently.

Correct coding: 92133 + 92134-59 with E11.311 (type 2 diabetes with mild nonproliferative diabetic retinopathy with macular edema, right eye) and H40.1130 (primary open-angle glaucoma, bilateral, stage unspecified)

Why: Modifier -59 on 92134 bypasses the NCCI PTP edit. The two studies serve clinically distinct purposes and each requires a separate, independently documented written report. Without both the modifier and the dual reports, one code will bundle and deny.

Scenario 3 (OCT-A performed, code selection is 92137, not 92134): A patient with choroidal neovascularization secondary to wet AMD undergoes retinal OCT combined with OCT angiography to map neovascular flow and assess lesion boundaries.

Correct coding: 92137 + H35.3210 (exudative AMD, right eye, stage unspecified)

Why: When OCT angiography is performed, 92137 (added January 1, 2025) is the correct and only code. Reporting 92134 alone when angiography was performed is undercoding; billing 92134 and 92137 together for the same eye is unbundling [1].

Scenario 4 (Hospital outpatient department, retinal OCT before intravitreal injection): A retinal specialist at a hospital-based outpatient clinic performs retinal OCT to evaluate subretinal fluid immediately before administering an intravitreal anti-VEGF injection (67028) for wet AMD. The hospital provides the equipment and imaging staff.

Correct coding (physician): 92134-26 + H35.3210; 67028-26 + H35.3210

Why: In the hospital outpatient setting, the physician bills the professional component (-26) for both services. The OCT is not bundled into the injection. The facility bills the TC for both, noting that 92134-TC carries APC STV-Packaged status, which may result in the TC being packaged into the facility APC for the injection. Confirm current packaging rules with the facility compliance team.

Related Codes

• 92133 — OCT, posterior segment, optic nerve; companion code for glaucoma and RNFL monitoring; NCCI edit applies when billed same-day with 92134; modifier -59 and dual reports required
• 92132 — OCT, anterior segment; use for cornea, iris, and anterior chamber imaging; not interchangeable with 92134
• 92137 — OCT, posterior segment, retina with OCT angiography; new January 1, 2025; supersedes 92134 when OCT-A flow mapping is performed
• 92250 — Fundus photography with interpretation and report; commonly billed same-day with 92134; no mandatory NCCI bundle; TC multiple procedure reduction applies
• 92235 — Fluorescein angiography with interpretation and report; distinct modality from OCT; billable same-day as 92134 with independent medical necessity
• 67028 — Intravitreal injection of pharmacological agent; frequently billed same-day as 92134 for wet AMD and DME anti-VEGF therapy; no bundling edit with 92134

Sources

1. AMA CPT 2025 Code Set — AMA, 2025. CPT descriptors, 2025 descriptor revision history, bilateral indicator, and MUE values for 92132 to 92137.
2. CMS Physician Fee Schedule Lookup Tool — CMS, 2025. RVU values, PC/TC indicator, multiple procedures indicator, and CY 2025 payment rates for 92134.
3. CMS NCCI Policy Manual for Medicare Services — CMS (updated quarterly). NCCI PTP edits and modifier -59 guidance applicable to diagnostic ophthalmology imaging codes.
4. CMS NCCI Medically Unlikely Edits — CMS, 2025. MUE = 1 for CPT 92134, Practitioner Services MUE Table.
5. HHS OIG Work Plan — HHS OIG, 2025. Active and completed work plan items for ophthalmic imaging and Medicare ophthalmology billing compliance.
6. CMS Medicare Coverage Database — CMS, 2025. Active LCD search for CPT 92134; verify L33634 (Novitas Solutions) and L38468 (CGS Administrators) status and covered diagnosis lists.
7. Federal Register — CY 2025 Medicare Physician Fee Schedule Final Rule — Federal Register, November 2024. CY 2025 MPFS final rule; RVU values and payment policy for diagnostic ophthalmology imaging codes.