ICD-10 T56
Non-Billable HeaderToxic effect of metals
About ICD-10-CM T56
ICD-10-CM code T56 represents Toxic effect of metals. This is a non-billable header code in the Injury, Poisoning, and External Causes chapter (block T56). The 2026 edition of ICD-10-CM T56 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 T56
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 T56. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- arsenic and its compounds (T57.0)
- manganese and its compounds (T57.2)
Includes
- toxic effects of fumes and vapors of metals
- toxic effects of metals from all sources, except medicinal substances
Use Additional Code
When coding T56, also report these additional codes when applicable.
- code to identify any retained metal foreign body, if applicable (Z18.0-, T18.1-)
Coding Notes
Seven Chr Note
- The appropriate 7th character is to be added to each code from category T56
Medicare LCD Coverage for T56
Local Coverage Determinations (LCDs) from CMS MACs that list T56 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 T56.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but T56 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with T56
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 T56
Other codes in section T51-T65 (Toxic effects of substances chiefly nonmedicinal as to source).
ICD-10 T56, Billing FAQ
Is ICD-10 code T56 billable? +
No, T56 is a non-billable header code. Use a more specific child code from block T56 when submitting claims.
What codes are Type 1 Excludes for T56? +
Type 1 Excludes (never code together with T56): arsenic and its compounds (T57.0); manganese and its compounds (T57.2)
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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