Is T56.1 a billable ICD-10-CM code?

No. T56.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does T56.1 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).

T56.1

T56.1 — Toxic effects of mercury and its compounds

Non-billable headerICD-10-CM

T56.1 is a non-billable header ICD-10-CM code for toxic effects of mercury and its compounds. 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

Other codes that can never be billed with T56.1

These codes carry an Excludes1 note pointing at T56.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading T56.1 alone.

T61Toxic effect of noxious substances eaten as seafood
T62Toxic effect of other noxious substances eaten as food

Risk adjustment

T56.1 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 T56.1 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 T56.1.

Minamata disease

Code to one of these instead T56.1

1 child code. Green means billable.

T56.1XToxic effects of mercury and its compounds

Related codes at this level

Codes that share T56. If T56.1 is not quite right, the correct code is usually one of these.

Questions about T56.1

Is T56.1 a billable ICD-10-CM code?: No. T56.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does T56.1 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).