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T58.12XA

T58.12XAToxic effect of carbon monoxide from utility gas, intentional self-harm, initial encounter

Billable / specific codeICD-10-CM

T58.12XA is a billable, specific ICD-10-CM code for toxic effect of carbon monoxide from utility gas, intentional self-harm, initial encounter. It is valid for submission on a claim.

7th character "A" — initial encounter

The appropriate 7th character is to be added to each code from category T58

A
initial encounter
D
subsequent encounter
S
sequela

Risk adjustment

T58.12XA risk-adjusts. Under the CMS-HCC V28 model it maps to these categories:

  • HCC 155 Major Depression, Moderate or Severe, without Psychosis0.299 RAF
  • HCC 155 Major Depression, Moderate or Severe, without Psychosis0.299 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.

Medicare coverage

T58.12XA is named in 5 Medicare coverage policies 5 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

  • A56612Billing and Coding: CT of the Head
  • A56625Billing and Coding: Echocardiography
  • A57205Billing and Coding: Oximetry Services
  • A57306Billing and Coding: Transthoracic Echocardiography (TTE)

Related codes at this level

Codes that share T58.12. If T58.12XA is not quite right, the correct code is usually one of these.

Questions about T58.12XA

Is T58.12XA a billable ICD-10-CM code?
Yes. T58.12XA is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does T58.12XA sit in the tabular list?
Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Toxic effects of substances chiefly nonmedicinal as to source (T51-T65).
ICD-10-CMFY2026-Apr· effective April 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.