Is T59 a billable ICD-10-CM code?

No. T59 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does T59 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 T59?

T59 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

T59

T59 — Toxic effect of other gases, fumes and vapors

Non-billable headerICD-10-CM

T59 is a non-billable header ICD-10-CM code for toxic effect of other gases, fumes and vapors. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.

This code requires a 7th character

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

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

chlorofluorocarbons (T53.5)

Includes

Conditions this code covers.

aerosol propellants

Other codes that can never be billed with T59

These codes carry an Excludes1 note pointing at T59. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading T59 alone.

T71Asphyxiation

Risk adjustment

T59 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.

Code to one of these instead T59

10 child codes. Green means billable.

Questions about T59

Is T59 a billable ICD-10-CM code?: No. T59 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does T59 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 T59?: T59 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.