S98.121A (Partial traumatic amputation of right great toe, initial encounter) compared with S98.121S (Partial traumatic amputation of right great toe, sequela), from the official CMS tabular data. S98.121A and S98.121S 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. S98.121A and S98.121S 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.
| S98.121APartial traumatic amputation of right great toe, initial encounter | S98.121SPartial traumatic amputation of right great toe, 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 | Partial traumatic amputation of right great toe, initial encounter is a billable ICD-10-CM diagnosis code (S98.121A). | Partial traumatic amputation of right great toe, sequela is a billable ICD-10-CM diagnosis code (S98.121S). |
| 7th character | The appropriate 7th character is to be added to each code from category S98 | The appropriate 7th character is to be added to each code from category S98 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources