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T59.821A ✓ Billable

Toxic effect of hexamethylene diisocyanate, accidental (unintentional), initial encounter

ICD-10-CM · FY2026 · Injury, Poisoning and Certain Other Consequences of External Causes

Code
T59.821A
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Injury, Poisoning and Certain Other Consequences of External Causes
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Official coding notes

From CMS's ICD-10-CM Tabular List.

Also known as
  • Toxic effects of hexamethylene diisocyanate NOS
Includes
  • aerosol propellants
Excludes1 — never code together
  • chlorofluorocarbons (T53.5)
7th character
  • The appropriate 7th character is to be added to each code from category T59

Frequently asked questions

What is ICD-10 code T59.821A?
ICD-10-CM code T59.821A represents Toxic effect of hexamethylene diisocyanate, accidental (unintentional), initial encounter. It is a billable diagnosis code in the Injury, Poisoning and Certain Other Consequences of External Causes chapter, effective October 1, 2025 – September 30, 2026.
Is T59.821A billable?
Yes. T59.821A is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is T59.821A in?
T59.821A belongs to the Injury, Poisoning and Certain Other Consequences of External Causes chapter (S00–T88) of ICD-10-CM.

Related codes in the T59 category

T59 Toxic effect of other gases, fumes and vapors Non-billable T59.0 Toxic effect of nitrogen oxides Non-billable T59.1 Toxic effect of sulfur dioxide Non-billable T59.2 Toxic effect of formaldehyde Non-billable T59.0X Toxic effect of nitrogen oxides Non-billable T59.1X Toxic effect of sulfur dioxide Non-billable T59.2X Toxic effect of formaldehyde Non-billable T59.0X1 Toxic effect of nitrogen oxides, accidental (unintentional) Non-billable

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