T59.2X1 Toxic effect of formaldehyde, accidental (unintentional)

The ICD-10-CM code for Toxic effect of formaldehyde, accidental (unintentional) is T59.2X1 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

19: Injury, poisoning and certain other consequences of external causes (S00-T88)

Section

T51-T65: Toxic effects of substances chiefly nonmedicinal as to source (T51-T65)

Category T59

65 codes (44 billable)

FY2026 Status

Stable since FY2024

Inclusion Terms

• Toxic effect of formaldehyde NOS

Official Coding Guidelines

Sequence blood vessel/nerve injury first (fragment)

injury is to the blood vessels or nerves, that injury should be sequenced first.

Do not assign injury codes for iatrogenic injuries; code complication

3) Iatrogenic injuries Injury codes from Chapter 19 should not be assigned for injuries that occur during, or as a result of, a medical intervention. Assign the appropriate complication code(s).

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool

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T59.2X1 — Toxic effect of formaldehyde, accidental (unintentional). ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/T59.2X1

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