S54.8X2A (Injury of other nerves at forearm level, left arm, initial encounter) compared with S54.8X2S (Injury of other nerves at forearm level, left arm, sequela), from the official CMS tabular data. S54.8X2A and S54.8X2S 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. S54.8X2A and S54.8X2S 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.
| S54.8X2AInjury of other nerves at forearm level, left arm, initial encounter | S54.8X2SInjury of other nerves at forearm level, left arm, 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 other nerves at forearm level, left arm, initial encounter is a billable ICD-10-CM diagnosis code (S54.8X2A). | Injury of other nerves at forearm level, left arm, sequela is a billable ICD-10-CM diagnosis code (S54.8X2S). |
| 7th character | The appropriate 7th character is to be added to each code from category S54 | The appropriate 7th character is to be added to each code from category S54 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources