Is T56.823 a billable ICD-10-CM code?

No. T56.823 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does T56.823 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 T56.823?

T56.823 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 T56.823 (T56.82, T56) and apply to it just the same.

T56.823

T56.823 — Toxic effect of gadolinium, assault

Non-billable headerICD-10-CM

T56.823 is a non-billable header ICD-10-CM code for toxic effect of gadolinium, assault. 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 T56

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 inherited from the categories above T56.823

These are not written on T56.823, but they bind it: a note on a category applies to every code beneath it. Billing T56.823 with anything listed here is a denial.

Written on T56.82 — Toxic effect of gadolinium

adverse effect of diagnostic agents (T50.8X5-)

Written on T56 — Toxic effect of metals

arsenic and its compounds (T57.0)
manganese and its compounds (T57.2)

Risk adjustment

T56.823 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

T56.823 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 T56.823

3 child codes. Green means billable.

Related codes at this level

Codes that share T56.82. If T56.823 is not quite right, the correct code is usually one of these.

Questions about T56.823

Is T56.823 a billable ICD-10-CM code?: No. T56.823 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does T56.823 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 T56.823?: T56.823 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 T56.823 (T56.82, T56) and apply to it just the same.