T58.91XD — Toxic effect of carbon monoxide from unspecified source, accidental (unintentional), subsequent encounter
T58.91XD is a billable, specific ICD-10-CM code for toxic effect of carbon monoxide from unspecified source, accidental (unintentional), subsequent encounter. It is valid for submission on a claim.
7th character "D" — subsequent 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
T58.91XD does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
T58.91XD is named in 2 Medicare coverage policies — 2 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
Related codes at this level
Codes that share T58.91. If T58.91XD is not quite right, the correct code is usually one of these.
Questions about T58.91XD
- Is T58.91XD a billable ICD-10-CM code?
- Yes. T58.91XD is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T58.91XD 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).