S94.91XA (Injury of unspecified nerve at ankle and foot level, right leg, initial encounter) compared with S94.91XS (Injury of unspecified nerve at ankle and foot level, right leg, sequela), from the official CMS tabular data. S94.91XA and S94.91XS 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. S94.91XA and S94.91XS 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.
| S94.91XAInjury of unspecified nerve at ankle and foot level, right leg, initial encounter | S94.91XSInjury of unspecified nerve at ankle and foot level, right leg, 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 | Injury of unspecified nerve at ankle and foot level, right leg, initial encounter is a billable ICD-10-CM diagnosis code (S94.91A). | Injury of unspecified nerve at ankle and foot level, right leg, sequela is a billable ICD-10-CM diagnosis code (S94.91S). |
| 7th character | The appropriate 7th character is to be added to each code from category S94 | The appropriate 7th character is to be added to each code from category S94 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources