Is S21.352S a billable ICD-10-CM code?

Yes. S21.352S is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does S21.352S sit in the tabular list?

Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the thorax (S20-S29).

What cannot be coded together with S21.352S?

S21.352S 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 S21.352S (S21.35, S21) and apply to it just the same.

S21.352S

S21.352S — Open bite of left front wall of thorax with penetration into thoracic cavity, sequela

Billable / specific codeICD-10-CMPOA exemptleft

S21.352S is a billable, specific ICD-10-CM code for open bite of left front wall of thorax with penetration into thoracic cavity, sequela. It is valid for submission on a claim.

7th character "S" — sequela

The appropriate 7th character is to be added to each code from category S21

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 inherited from the categories above S21.352S

These are not written on S21.352S, but they bind it: a note on a category applies to every code beneath it. Billing S21.352S with anything listed here is a denial.

Written on S21.35 — Open bite of front wall of thorax with penetration into thoracic cavity

superficial bite of front wall of thorax (S20.37)

Written on S21 — Open wound of thorax

traumatic amputation (partial) of thorax (S28.1)

Risk adjustment

S21.352S 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.

Medicare coverage

S21.352S is named in 11 Medicare coverage policies — 11 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A53057Billing and Coding: Home Health Occupational Therapy
A53058Billing and Coding: Home Health Physical Therapy
A53064Billing and Coding: Outpatient Occupational Therapy
A53065Billing and Coding: Outpatient Physical Therapy

Code history

S21.352S has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share S21.352. If S21.352S is not quite right, the correct code is usually one of these.

Questions about S21.352S

Is S21.352S a billable ICD-10-CM code?: Yes. S21.352S is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does S21.352S sit in the tabular list?: Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the thorax (S20-S29).
What cannot be coded together with S21.352S?: S21.352S 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 S21.352S (S21.35, S21) and apply to it just the same.