Is T21 a billable ICD-10-CM code?

No. T21 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does T21 sit in the tabular list?

Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Burns and corrosions of external body surface, specified by site (T20-T25).

T21

T21 — Burn and corrosion of trunk

Non-billable headerICD-10-CM

T21 is a non-billable header ICD-10-CM code for burn and corrosion of trunk. 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 T21

A: initial encounter
D: subsequent encounter
S: sequela

Excludes2 — not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

burns and corrosion of axilla (T22.- with fifth character 4)
burns and corrosion of scapular region (T22.- with fifth character 6)
burns and corrosion of shoulder (T22.- with fifth character 5)

Includes

Conditions this code covers.

burns and corrosion of hip region

Risk adjustment

T21 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 T21

8 child codes. Green means billable.

Questions about T21

Is T21 a billable ICD-10-CM code?: No. T21 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does T21 sit in the tabular list?: Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Burns and corrosions of external body surface, specified by site (T20-T25).