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T59.6X1A

T59.6X1A: Toxic effect of hydrogen sulfide, accidental (unintentional), initial encounter

Billable / specific codeICD-10-CM

T59.6X1A is a billable, specific ICD-10-CM code for toxic effect of hydrogen sulfide, accidental (unintentional), initial encounter. It is valid for submission on a claim.

Check T59.6X1A with the rest of the claim: free scrubber

7th character "A": initial encounter

The appropriate 7th character is to be added to each code from category T59

A
initial encounter
D
subsequent encounter
S
sequela

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

  • Toxic effect of hydrogen sulfide NOS

Excludes1 inherited from the categories above T59.6X1A

A category’s note binds every code beneath it.

Written on T59: Toxic effect of other gases, fumes and vapors

  • chlorofluorocarbons (T53.5)

Other codes that can never be billed with T59.6X1A

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • T71Asphyxiation

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

T59.6X1A is named in 4 Medicare coverage policies: 4 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

  • A56612Billing and Coding: CT of the Head
  • A56717Billing and Coding: Respiratory Therapy (Respiratory Care)
  • A57205Billing and Coding: Oximetry Services
  • A57224Billing and Coding: Respiratory Care

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under T59.6X1

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.