Is T59.9 a billable ICD-10-CM code?

No. T59.9 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does T59.9 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).

T59.9

T59.9 — Toxic effect of unspecified gases, fumes and vapors

Non-billable headerICD-10-CM

T59.9 is a non-billable header ICD-10-CM code for toxic effect of unspecified 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

Risk adjustment

T59.9 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.

How T59.9 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to T59.9.

Vapor asphyxia or suffocation

Code to one of these instead T59.9

4 child codes. Green means billable.

Related codes at this level

Codes that share T59. If T59.9 is not quite right, the correct code is usually one of these.

Questions about T59.9

Is T59.9 a billable ICD-10-CM code?: No. T59.9 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does T59.9 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).