Summary & Overview
CPT 0402T: Corneal Collagen Crosslinking with Riboflavin and UV-A
CPT code 0402T describes corneal collagen crosslinking using riboflavin (vitamin B2) eyedrops activated by ultraviolet light to strengthen corneal fibers. This outpatient ophthalmic procedure, sometimes performed with epithelial removal and pachymetry to confirm corneal thickness, is an increasingly relevant treatment for progressive corneal ectatic disorders such as keratoconus. Nationally, the code matters for coverage policy, access to sight-preserving interventions, and setting appropriate reimbursement for ambulatory ophthalmology services. Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will learn clinical context for the procedure, typical sites of service, and the policy and coverage landscape across major national payers. The publication summarizes benchmarks where available, highlights recent policy updates affecting utilization and prior authorization, and outlines billing considerations that influence facility and professional payments. When specific data elements are not provided in the source, the text indicates "Data not available in the input." The goal is to equip ophthalmology providers, billing specialists, and policy analysts with a concise briefing on CPT code 0402T, its clinical use, and the payer context that shapes adoption and reimbursement nationally.
Billing Code Overview
CPT code 0402T describes a procedure that applies vitamin B2 (riboflavin) eyedrops activated by ultraviolet (UV) light to strengthen corneal collagen crosslinking, producing a stiffer, stronger cornea. The procedure may include removal of the corneal epithelium (epi-off technique) and intraoperative pachymetry to measure corneal thickness to guide treatment.
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Service type: Corneal collagen crosslinking procedure using riboflavin and UV-A activation
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Typical site of service: Ophthalmology outpatient clinic or ambulatory surgical center where corneal procedures and UV-based treatments are performed
Clinical & Coding Specifications
Clinical Context
A typical patient is an adolescent or young adult presenting to an ophthalmology clinic with progressive keratoconus or post-refractive ectasia causing visual distortion and decreasing contact lens tolerance. The clinical workflow begins with diagnostic evaluation including manifest refraction, slit-lamp examination, corneal topography/tomography and pachymetry to document corneal thinning and irregular astigmatism. After conservative measures (rigid gas permeable lenses or scleral lenses) are considered, the surgeon discusses corneal collagen cross-linking using riboflavin (vitamin B2) with ultraviolet-A activation to stiffen the cornea.
On the procedure day the patient arrives to an ambulatory surgery center or ophthalmology clinic procedure room. Topical anesthesia is applied; the surgeon may remove the central corneal epithelium (epithelium-off technique) or leave it intact (epithelium-on) per protocol. Pachymetry is used intraoperatively to confirm safe corneal thickness; supplemental riboflavin drops are instilled to saturate the stroma. Ultraviolet-A light is applied to activate the riboflavin, inducing crosslinking. Post-procedure care includes topical antibiotics, cycloplegia as needed, and a bandage contact lens if epithelium was removed. Follow-up visits include recheck of pain, epithelial healing, corneal clarity, and serial topography to document stabilization of ectatic progression.
Typical site of service: ambulatory surgery center or ophthalmology clinic procedure room. Service type: ophthalmic therapeutic procedure (corneal collagen cross-linking) with intraoperative pachymetry and possible epithelial removal.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
23 | Unusual anesthesia | Use when general anesthesia is required and not normally used for this minor ophthalmic procedure. |
25 | Significant, separately identifiable E/M service on same day | Use when a distinct evaluation and management visit is provided the same day as the procedure. |
52 | Reduced services | Use when the procedure is partially reduced or not completed as planned. |
53 | Discontinued procedure | Use when the procedure is started but terminated due to unforeseen circumstances. |
62 | Two surgeons | Use when two surgeons work together as primary surgeons for complex cases. |
66 | Surgical team | Use when a surgical team performs the procedure per institutional policy. |
73 | Discontinued outpatient surgery prior to anesthesia induction | Use when the scheduled cross-linking is cancelled after the patient arrives but before anesthesia. |
78 | Unplanned return to OR for related procedure during postoperative period | Use when a return procedure is required for a complication of the cross-linking. |
79 | Unrelated procedure or service during postoperative period | Use when an unrelated procedure is performed during the global period. |
AS | Physician assistant, nurse practitioner, or clinical nurse specialist service | Use when the service is billed under an eligible nonphysician practitioner where applicable. |
LT | Left side | Use to designate the left eye when laterality reporting is required. |
RT | Right side | Use to designate the right eye when laterality reporting is required. |
TC | Technical component | Use when billing only the technical component of the procedure (facility equipment/staff). |
26 | Professional component | Use when billing only the physician’s professional component (interpretation/technical supervision). |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 207W00000X | Ophthalmology | Corneal surgeons and general ophthalmologists perform corneal cross-linking. |
| 207WP0800X | Corneal and External Disease | Subspecialists who commonly perform complex corneal procedures including cross-linking. |
| 363LA2200X | Optometrist | Optometrists may perform pre- and post-procedure care and co-manage in some jurisdictions. |
| 208D00000X | Optometry (Ophthalmic Technician role) | Allied eye care providers support diagnostics, pachymetry, and perioperative care. |
| 207K00000X | Ophthalmic Plastic and Reconstructive Surgery | Occasionally involved when anterior segment reconstruction or complexity overlaps. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
H18.60 | Corneal ectasia, unspecified | Represents keratoconic or post-refractive ectatic disease treated with corneal cross-linking. |
H18.61 | Keratoconus | Primary indication for corneal collagen cross-linking to halt progression. |
H18.62 | Pellucid marginal degeneration | Another ectatic corneal disorder where cross-linking may be considered. |
H18.49 | Other corneal dystrophies | Some dystrophies associated with stromal weakness considered for cross-linking in select cases. |
H16.9 | Keratitis, unspecified | Active infection is a contraindication; code used when evaluating corneal inflammation during decision-making. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
92250 | Fundus photography with interpretation and report | Baseline and follow-up imaging for documentation of ocular status; not specific to cornea but part of comprehensive records. |
92132 | Scanning computerized ophthalmic diagnostic imaging, posterior segment, with interpretation | Used for baseline retinal assessment when comprehensive ocular evaluation is performed prior to cross-linking. |
92083 | Visual field examination, extended | Performed when broader functional assessment of vision is needed in preoperative evaluation. |
92100 | Serial tonometry and tonography | Intraocular pressure checks may be performed pre- and post-procedure to monitor ocular health. |
99173 | Screening test of visual acuity, quantitative, bilateral | Basic visual acuity assessment used in pre- and postoperative visits. |
76514 | Corneal topography, videokeratography, unilateral or bilateral | Essential diagnostic test to document keratoconus extent and to monitor response to cross-linking. |