ICD-10 T59
Non-Billable HeaderToxic effect of other gases, fumes and vapors
About ICD-10-CM T59
ICD-10-CM code T59 represents Toxic effect of other gases, fumes and vapors. This is a non-billable header code in the Injury, Poisoning, and External Causes chapter (block T59). The 2026 edition of ICD-10-CM T59 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 T59
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.
Type 1 Excludes
Pure excludes, these codes can never be coded together with T59. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- chlorofluorocarbons (T53.5)
Includes
- aerosol propellants
Coding Notes
Seven Chr Note
- The appropriate 7th character is to be added to each code from category T59
Medicare LCD Coverage for T59
Local Coverage Determinations (LCDs) from CMS MACs that list T59 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 T59.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but T59 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with T59
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 T59
Other codes in section T51-T65 (Toxic effects of substances chiefly nonmedicinal as to source).
ICD-10 T59, Billing FAQ
Is ICD-10 code T59 billable? +
No, T59 is a non-billable header code. Use a more specific child code from block T59 when submitting claims.
What codes are Type 1 Excludes for T59? +
Type 1 Excludes (never code together with T59): chlorofluorocarbons (T53.5)
Get the full PayerReady toolkit
Free access to CPT/ICD-10 lookup, denial appeals, fee comparator, and claim auditing with credentialing enrollment.
Start free →Run this code through our claim audit tool
Check NCCI bundling, MUE limits, and modifier logic before submission.
Try the auditor →Did this page help?
Quick signal so we know what to improve.
If you want a code reference page that doesn't exist yet, email coding@payerready.com.
Tell us what's missing or wrong: coding@payerready.com. We respond within 5 business days.
Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
Powered by 11K CPT · 98K ICD-10 · 860K MPFS rates · 4.5M NCCI edits · 9.5M NPIs. Our data methodology · About our coding team