S79.922A (Unspecified injury of left thigh, initial encounter) compared with S79.922S (Unspecified injury of left thigh, sequela), from the official CMS tabular data. S79.922A and S79.922S 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. S79.922A and S79.922S 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.
| S79.922AUnspecified injury of left thigh, initial encounter | S79.922SUnspecified injury of left thigh, 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 | Unspecified injury of left thigh, initial encounter is a billable ICD-10-CM diagnosis code (S79.922A). | Unspecified injury of left thigh, sequela is a billable ICD-10-CM diagnosis code (S79.922S). |
| 7th character | The appropriate 7th character is to be added to each code in subcategory S79.9 | The appropriate 7th character is to be added to each code in subcategory S79.9 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources