Is T82.21 a billable ICD-10-CM code?

No. T82.21 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does T82.21 sit in the tabular list?

Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Complications of surgical and medical care, not elsewhere classified (T80-T88).

What cannot be coded together with T82.21?

T82.21 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 T82.21 (T82.2) and apply to it just the same.

T82.21

T82.21 — Mechanical complication of coronary artery bypass graft

Non-billable headerICD-10-CM

T82.21 is a non-billable header ICD-10-CM code for mechanical complication of coronary artery bypass graft. 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 T82

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 inherited from the categories above T82.21

These are not written on T82.21, but they bind it: a note on a category applies to every code beneath it. Billing T82.21 with anything listed here is a denial.

Written on T82.2 — Mechanical complication of coronary artery bypass graft and biological heart valve graft

mechanical complication of artificial heart valve prosthesis (T82.0-)

Excludes2 inherited from the categories above T82.21

Also inherited, and the opposite of Excludes1: these conditions are not part of T82.21, but a patient can have both, so you may code both.

Written on T82 — Complications of cardiac and vascular prosthetic devices, implants and grafts

failure and rejection of transplanted organs and tissue (T86.-)

Risk adjustment

T82.21 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

T82.21 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 T82.21

4 child codes. Green means billable.

Related codes at this level

Codes that share T82.2. If T82.21 is not quite right, the correct code is usually one of these.

T82.22Mechanical complication of biological heart valve graft

Questions about T82.21

Is T82.21 a billable ICD-10-CM code?: No. T82.21 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does T82.21 sit in the tabular list?: Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Complications of surgical and medical care, not elsewhere classified (T80-T88).
What cannot be coded together with T82.21?: T82.21 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 T82.21 (T82.2) and apply to it just the same.