Is T65.0X4A a billable ICD-10-CM code?

Yes. T65.0X4A is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does T65.0X4A 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).

What cannot be coded together with T65.0X4A?

T65.0X4A carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above T65.0X4A (T65.0) and apply to it just the same.

T65.0X4A

T65.0X4A — Toxic effect of cyanides, undetermined, initial encounter

Billable / specific codeICD-10-CM

T65.0X4A is a billable, specific ICD-10-CM code for toxic effect of cyanides, undetermined, 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 T65

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 inherited from the categories above T65.0X4A

These are not written on T65.0X4A, but they bind it: a note on a category applies to every code beneath it. Billing T65.0X4A with anything listed here is a denial.

Written on T65.0 — Toxic effect of cyanides

hydrogen cyanide (T57.3-)

Risk adjustment

T65.0X4A 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

T65.0X4A 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
A57205Billing and Coding: Oximetry Services

Code history

T65.0X4A has not changed since FY2024 — no addition, revision or deletion across the FY2024–FY2027 ICD-10-CM releases.

Related codes at this level

Codes that share T65.0X4. If T65.0X4A is not quite right, the correct code is usually one of these.

Questions about T65.0X4A

Is T65.0X4A a billable ICD-10-CM code?: Yes. T65.0X4A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does T65.0X4A 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).
What cannot be coded together with T65.0X4A?: T65.0X4A carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above T65.0X4A (T65.0) and apply to it just the same.