MCMCB Pro
S21.029A

S21.029ALaceration with foreign body of unspecified breast, initial encounter

Billable / specific codeICD-10-CMunspecified

S21.029A is a billable, specific ICD-10-CM code for laceration with foreign body of unspecified breast, initial encounter. It is valid for submission on a claim.

7th character "A" — initial encounter

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

A
initial encounter
D
subsequent encounter
S
sequela

Risk adjustment

S21.029A 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.

Related codes at this level

Codes that share S21.029. If S21.029A is not quite right, the correct code is usually one of these.

Questions about S21.029A

Is S21.029A a billable ICD-10-CM code?
Yes. S21.029A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does S21.029A 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).
ICD-10-CMFY2026-Apr· effective April 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release — see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.