S27.59XA (Other injury of thoracic trachea, initial encounter) compared with S27.59XS (Other injury of thoracic trachea, sequela), from the official CMS tabular data. S27.59XA and S27.59XS code the same injury at a different phase of treatment.
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
Same injury, other encounter phase. S27.59XA and S27.59XS 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.
| S27.59XAOther injury of thoracic trachea, initial encounter | S27.59XSOther injury of thoracic trachea, sequela | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | S00-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) |
| Definition | Other injury of thoracic trachea, initial encounter is a billable ICD-10-CM diagnosis code (S27.59A). | Other injury of thoracic trachea, sequela is a billable ICD-10-CM diagnosis code (S27.59S). |
| 7th character | The appropriate 7th character is to be added to each code from category S27 | The appropriate 7th character is to be added to each code from category S27 |
| Includes | injuries of breast injuries of chest (wall) injuries of interscapular area Secondary blast injury of thoracic trachea | injuries of breast injuries of chest (wall) injuries of interscapular area Secondary blast injury of thoracic trachea |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources