ICD-10 T26.9
Non-Billable HeaderCorrosion of eye and adnexa, part unspecified
About ICD-10-CM T26.9
ICD-10-CM code T26.9 represents Corrosion of eye and adnexa, part unspecified. This is a non-billable header code in the Injury, Poisoning, and External Causes chapter (block T26). The 2026 edition of ICD-10-CM T26.9 became effective on October 1, 2025. Non-billable codes cannot be used as a primary or secondary diagnosis on a claim, use a more specific child code instead.
Coding Tips for T26.9
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
Injury codes require a 7th character: A (initial encounter, active treatment), D (subsequent, healing/recovery), S (sequela, late effect of original injury). Codes with fewer than 6 characters need the placeholder X to bring them to 6 characters before adding the 7th. Wrong or missing 7th character is the #1 cause of injury claim denials.
Use Additional Code
When coding T26.9, also report these additional codes when applicable.
- external cause code to identify place (Y92)
Coding Notes
Code First
- (T51-T65) to identify chemical and intent
Medicare LCD Coverage for T26.9
Local Coverage Determinations (LCDs) from CMS MACs that list T26.9 as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing T26.9.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but T26.9 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with T26.9
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Codes Adjacent To T26.9
Other codes in section T26-T28 (Burns and corrosions confined to eye and internal organs).
ICD-10 T26.9, Billing FAQ
Is ICD-10 code T26.9 billable? +
No, T26.9 is a non-billable header code. Use a more specific child code from block T26 when submitting claims.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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