S71.121A (Laceration with foreign body, right thigh, initial encounter) compared with S71.121S (Laceration with foreign body, right thigh, sequela), from the official CMS tabular data. S71.121A and S71.121S code the same injury at a different phase of treatment. MedCoder-derived
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. S71.121A and S71.121S 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.
| S71.121ALaceration with foreign body, right thigh, initial encounter | S71.121SLaceration with foreign body, right thigh, sequela | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | S00-T88 — Injury, poisoning and certain other consequences of external causes | S00-T88 — Injury, poisoning and certain other consequences of external causes |
| Definition | Laceration with foreign body, right thigh, initial encounter is a billable ICD-10-CM diagnosis code (S71.121A). | Laceration with foreign body, right thigh, sequela is a billable ICD-10-CM diagnosis code (S71.121S). |
| 7th character | The appropriate 7th character is to be added to each code from category S71 | The appropriate 7th character is to be added to each code from category S71 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources