Is T56 a billable ICD-10-CM code?

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

Where does T56 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?

T56 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

T56

T56 — Toxic effect of metals

Non-billable headerICD-10-CM

T56 is a non-billable header ICD-10-CM code for toxic effect of metals. 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 — never code together

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

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

Use additional code

Add a secondary code to capture the detail described below.

code to identify any retained metal foreign body, if applicable (Z18.0-, T18.1-)

Includes

Conditions this code covers.

toxic effects of fumes and vapors of metals
toxic effects of metals from all sources, except medicinal substances

Other codes that can never be billed with T56

These codes carry an Excludes1 note pointing at T56. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading T56 alone.

R78.71Abnormal lead level in blood
T60.4Toxic effect of rodenticides
T61Toxic effect of noxious substances eaten as seafood
T62Toxic effect of other noxious substances eaten as food

Risk adjustment

T56 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 T56

10 child codes. Green means billable.

Questions about T56

Is T56 a billable ICD-10-CM code?: No. T56 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does T56 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?: T56 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.