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S21.229A vs S21.229S

S21.229A (Laceration with foreign body of unspecified back wall of thorax without penetration into thoracic cavity, initial encounter) compared with S21.229S (Laceration with foreign body of unspecified back wall of thorax without penetration into thoracic cavity, sequela), from the official CMS tabular data. S21.229A and S21.229S code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

S21.229A
Initial encounter
Laceration with foreign body of unspecified back wall of thorax without penetration into thoracic cavity, initial encounter
↔
S21.229S
Sequela
Laceration with foreign body of unspecified back wall of thorax without penetration into thoracic cavity, sequela

Same underlying diagnosis, different encounter phase.

The 7th character records the phase of care for the encounter being coded, so a single encounter takes one of these characters, not several. Review whether both phases belong on the same episode of care.

Source: ICD-10-CM Official Guidelines, Section I.C.19.a

Can these codes be reported together?

Same injury, other encounter phase. S21.229A and S21.229S code the same injury at a different phase of treatment, set by the 7th character.

The 7th character records the type of care given at the encounter being coded (ICD-10-CM Official Guidelines, Section I.C.19.a), so one encounter takes one of these, not both.

Side by side

S21.229ALaceration with foreign body of unspecified back wall of thorax without penetration into thoracic cavity, initial encounterS21.229SLaceration with foreign body of unspecified back wall of thorax without penetration into thoracic cavity, sequela
Billing statusBillableBillable
ClassificationS00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionLaceration with foreign body of unspecified back wall of thorax without penetration into thoracic cavity, initial encounter is a billable ICD-10-CM diagnosis code (S21.229A).Laceration with foreign body of unspecified back wall of thorax without penetration into thoracic cavity, sequela is a billable ICD-10-CM diagnosis code (S21.229S).
7th characterThe appropriate 7th character is to be added to each code from category S21The appropriate 7th character is to be added to each code from category S21
Includes
injuries of breast
injuries of chest (wall)
injuries of interscapular area
injuries of breast
injuries of chest (wall)
injuries of interscapular area
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources