Is T52.4 a billable ICD-10-CM code?

No. T52.4 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does T52.4 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 T52.4?

T52.4 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 T52.4 (T52) and apply to it just the same.

T52.4

T52.4 — Toxic effects of ketones

Non-billable headerICD-10-CM

T52.4 is a non-billable header ICD-10-CM code for toxic effects of ketones. 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 T52

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 inherited from the categories above T52.4

These are not written on T52.4, but they bind it: a note on a category applies to every code beneath it. Billing T52.4 with anything listed here is a denial.

Written on T52 — Toxic effect of organic solvents

halogen derivatives of aliphatic and aromatic hydrocarbons (T53.-)

Risk adjustment

T52.4 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 history

T52.4 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead T52.4

1 child code. Green means billable.

T52.4XToxic effects of ketones

Related codes at this level

Codes that share T52. If T52.4 is not quite right, the correct code is usually one of these.

Questions about T52.4

Is T52.4 a billable ICD-10-CM code?: No. T52.4 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does T52.4 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 T52.4?: T52.4 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 T52.4 (T52) and apply to it just the same.