ICD-10 T23.042
Non-Billable HeaderBurn of unspecified degree of multiple left fingers (nail), including thumb
About ICD-10-CM T23.042
ICD-10-CM code T23.042 represents Burn of unspecified degree of multiple left fingers (nail), including thumb. This is a non-billable header code in the Injury, Poisoning, and External Causes chapter (block T23). The 2026 edition of ICD-10-CM T23.042 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 T23.042
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.
Medicare LCD Coverage for T23.042
Local Coverage Determinations (LCDs) from CMS MACs that list T23.042 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 T23.042.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but T23.042 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with T23.042
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 T23.042
Other codes in section T20-T25 (Burns and corrosions of external body surface, specified by site).
ICD-10 T23.042, Billing FAQ
Is ICD-10 code T23.042 billable? +
No, T23.042 is a non-billable header code. Use a more specific child code from block T23 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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