T26.6 Corrosion of cornea and conjunctival sac

ICD-10-CM Code T26.6: Corrosion of cornea and conjunctival sac

ICD-10-CM code T26.6 designates a diagnosis of corrosion of the cornea and conjunctival sac. It is categorized under burns and corrosions confined to the eye and adnexa. The code has more specific child codes that specify the affected eye, such as the right eye, left eye, or unspecified eye. A related billing article references this code family during external ocular photography guidance. 4 5 3

Plain-language overview

ICD-10-CM code T26.6 represents the diagnosis of corrosion of the cornea and conjunctival sac. This code is listed within Chapter 19, which covers injury, poisoning, and certain other consequences of external causes. 5

What this code represents

Code T26.6 is a parent concept with more specific child codes. These child codes identify the affected eye as the right eye, the left eye, or an unspecified eye. 4 5

Coding details

Within the ICD-10-CM hierarchy, T26.6 falls under category T26 for burn and corrosion confined to eye and adnexa. This category is part of the T26-T28 range for burns and corrosions confined to eye and internal organs. 5

The reference record for T26.6 lists no inclusion terms. Additionally, no "code first" instruction and no "use additional code" instruction are listed for T26.6. 5

Documentation considerations

A Centers for Medicare and Medicaid Services billing and coding article for external ocular photography references a specific child code. The referenced code denotes corrosion of the cornea and conjunctival sac of the right eye resulting in rupture and destruction. 3 5

What the sources add

The CMS article provides billing and coding guidance for external ocular photography and mentions the T26.6 code family. The Vero source provides the structural hierarchy and instructional notes for the T26.6 code. 3 5

Clinical context

Research literature describes ocular corrosion testing methods that apply substances to the cornea and conjunctival sac. These tests evaluate and score injuries to the cornea, conjunctiva, and iris. 2

One animal study evaluated eye irritation and corrosion by applying a test substance to the conjunctival sac. The study macroscopically observed eye reactions at specific intervals up to 72 hours after treatment. 1

Sources

1. Evaluation of potential eye or skin irritation/corrosion in rabbit exposed to TiO2 photocatalyst (GST) — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
2. Alternatives to In Vivo Draize Rabbit Eye and Skin Irritation Tests with a Focus on 3D Reconstructed Human Cornea-Like Epithelium and Epidermis Models — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
3. Article - Billing and Coding: Ocular Photography - External (A57068) — cms.gov; accessed 2026-07-25.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-25.
5. ICD-10-CM Code T26.6 | Vero — veroscribe.com; accessed 2026-07-25.