Corneal Collagen Cross-Linking
DESCRIPTION
Corneal collagen cross-linking (CXL) is a photochemical procedure used in the treatment of progressive keratoconus and corneal ectasia. Keratoconus is a naturally occurring dystrophy of the cornea characterized by progressive deformation (steepening) of the cornea while corneal ectasia is keratoconus that occurs after refractive surgery. Both lead to functional loss of vision and need for corneal transplantation. The goal of keratoconus treatment is to reshape the abnormal cornea into a normal dome-like shape, which allows light entering the eye to focus on the retina, improving current visual function and preventing additional vision loss.
CXL is performed with the photosensitizer riboflavin (vitamin B2) and ultraviolet-A (UVA) irradiation. Currently the only CXL method approved by the Food and Drug Administration (FDA) is the epithelium-off method. Using this method, about 8 mm of the central corneal epithelium is removed under topical anesthesia to allow better diffusion of the photosensitizer riboflavin into the stroma. Following de-epithelialization, a solution with riboflavin is applied to the cornea (every 1-3 minutes for 30 minutes) until the stroma is completely penetrated. The cornea is then irradiated with UVA at a maximal wavelength to allow for absorption by riboflavin. The interaction of riboflavin and UVA causes the formation of reactive oxygen species, leading to additional covalent bonds (cross-linking) between collagen molecules that results in stiffening of the cornea.
Another method being evaluated is the epithelium-on method (also known as epi-on or transepithelial). With this method, the corneal epithelial surface is left intact or is partially disrupted and a longer riboflavin loading time is required. This method is still under investigation.
POLICY
Corneal collagen cross-linking may be considered medically necessary if the medical appropriateness criteria are met. (See Medical Appropriateness below.)
Corneal collagen cross-linking for the treatment of other conditions/diseases, including use of the epithelium-on (epi-on or transepithelial) method, is considered investigational.
MEDICAL APPROPRIATENESS
Corneal collagen cross-linking is considered medically appropriate if ALL the following are met:
Treatment is indicated for ANY ONE of the following conditions:
Progressive keratoconus
Corneal ectasia after refractive surgery
Failure of conservative treatment (e.g., spectacle correction, rigid contact lens)
IMPORTANT REMINDERS
Any specific products referenced in this policy are just examples and are intended for illustrative purposes only. It is not intended to be a recommendation of one product over another, and is not intended to represent a complete listing of all products available. These examples are contained in the parenthetical e.g. statement.
We develop Medical Policies to provide guidance to Members and Providers. This Medical Policy relates only to the services or supplies described in it. The existence of a Medical Policy is not an authorization, certification, explanation of benefits or a contract for the service (or supply) that is referenced in the Medical Policy. For a determination of the benefits that a Member is entitled to receive under his or her health plan, the Member's health plan must be reviewed. If there is a conflict between the medical policy and a health plan or government program (e.g., TennCare), the express terms of the health plan or government program will govern.
ADDITIONAL INFORMATION
In 2016, riboflavin 5’-phospate in 20% dextran ophthalmic solution (Photrexa Viscous®; Avedro) and riboflavin 5’-phosphate ophthalmic solution (Photrexa®; Avedro) were approved by the U.S. Food and Drug Administration for use with KXL System in corneal collagen cross-linking for the treatment of progressive keratoconus and corneal ectasia after refractive surgery.
SOURCES
American Academy of Ophthalmology (AAO). Preferred Practice Pattern. (2023). Corneal ectasia. Retrieved April 24, 2024 from https://www.aao.org.
BlueCross BlueShield Association. Evidence Positioning System. (4:2024). Corneal collagen cross-linking (9.03.28). Retrieved April 24, 2024 from https://www.bcbsaoca.com/eps/. (20 articles and/or guidelines reviewed)
Henriquez, M.A., Villegas, S., Rincon, M., Maldonado, C., & Izquierdo, L. (2018). Long-term efficacy and safety after corneal collagen crosslinking in pediatric patients: three-year follow-up. European Journal of Ophthalmology, 28 (4), 415-418. (Level 2 evidence)
Khattak, A., Nakhli, F., & Cheema, H. (2015). Corneal collagen crosslinking for progressive keratoconus in Saudi Arabia: one-year controlled clinical trial analysis. Saudi Journal of Ophthalmology, 29, 249-254. (Level 2 evidence)
Kobashi, H., Hieda, O., Itoi, M., Kamiya, K., Kato, N., et al. (2021). Corneal cross-linking for paediatric keratoconus: a systematic review and meta-Analysis. Journal of Clinical Medicine, 10 (12), 2626. (Level 1 evidence)
Lang, S., Messmer, E., Geerling, G., Mackert, M., Brunner, T., et al. (2015). Prospective, randomized, double-blind trial to investigate the efficacy and safety of corneal cross-linking to halt the progression of keratoconus. BMC Ophthalmology, 15, 78. (Level 2 evidence)
Margines, J. B., Rabinowitz, Y. S., Li, X., & Gaster, R. N. (2023). Results of corneal collagen cross-linking in patients with corneal ectasia after laser refractive surgery-A prospective study. Photodiagnosis and pPhotodynamic Therapy, 42, 103521, doi: 10.1016/j.pdpdt.2023.103521. Abstract retrieved April 24, 2024 from PubMed database.
National Institute for Health and Clinical Excellence. (2013, September). Photochemical corneal collagen cross-linkage using riboflavin and ultraviolet A for keratoconus and keratectasia. Retrieved July 21, 2016 from www.nice.org.uk.
O’Brart, D.P. (2017). Corneal collagen crosslinking for corneal ectasias: a review. European Journal of Ophthalmology, 27 (3), 253-269. Abstract retrieved March 10, 2017 from PubMed database.
Padmanabhan, P, Reddi, S.R., Rajagopal, R., Natarajan, R., Iyer, G., Srinivasan, B., et al. (2016). Corneal collagen cross-linking for keratoconus in pediatric patients- long term results. Cornea, 36 (2), 138-143. Abstract retrieved March 10, 2017 from PubMed database.
Papaioannou, L., Miligkos, M., & Papathanassiou, M. (2016). Corneal collagen cross-linking for infectious keratitis: a systematic review and meta-analysis. Cornea, 35 (1), 62-71. Abstract retrieved March 10, 2017 from PubMed database.
Poli, M., Lefevre, A., Auxenfans, C., & Burillon, C. (2015). Corneal collagen cross-linking for the treatment of progressive corneal ectasia: 6-year prospective outcome in a french population. American Journal of Ophthalmology, 160 (4), 654-662. Abstract retrieved November 4, 2016 from PubMed database.
Rush, W.W., & Rush, R.B. (2016). Epithelium-off versus transepithelial corneal collagen crosslinking for progressive corneal ectasia: a randomized and controlled trial. The British Journal of Ophthalmology, 101 (4), 503-508. Abstract retrieved March 10, 2017 from PubMed database.
Sorkine, N., & Varssanoe, D. (2014). Corneal collagen crosslinking: A systematic review. Ophthalmologica, 232 (1), 1-60. (Level 1 evidence)
U.S. Food and Drug Administration. Center for Drug Evaluation and Research. Summary review, application number 203324Orig2s000. Retrieved March 10, 2017 from http://www.accessdata.fda.gov.
Winifred S. Hayes, Inc. Medical Technology Directory. (2018, December; last update search March 2023). Conventional corneal collagen cross-linking for treatment of LASIK-related ectasia. Retrieved April 24, 2024 from www.Hayesinc.com/subscribers. (42 articles and/or guidelines reviewed)
Winifred S. Hayes, Inc. Medical Technology Directory. (2018, February; last update search January 2022). Corneal cross-linking for treatment of keratoconus. Retrieved December 19, 2022 from www.Hayesinc.com/subscribers. (66 articles and/or guidelines reviewed)
ORIGINAL EFFECTIVE DATE: 11/10/2012
MOST RECENT REVIEW DATE: 6/13/2024
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Policies included in the Medical Policy Manual are not intended to certify coverage availability. They are medical determinations about a particular technology, service, drug, etc. While a policy or technology may be medically necessary, it could be excluded in a member's benefit plan. Please check with the appropriate claims department to determine if the service in question is a covered service under a particular benefit plan. Use of the Medical Policy Manual is not intended to replace independent medical judgment for treatment of individuals. The content on this Web site is not intended to be a substitute for professional medical advice in any way. Always seek the advice of your physician or other qualified health care provider if you have questions regarding a medical condition or treatment.
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