S58.921A (Partial traumatic amputation of right forearm, level unspecified, initial encounter) compared with S58.921S (Partial traumatic amputation of right forearm, level unspecified, sequela), from the official CMS tabular data. S58.921A and S58.921S 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. S58.921A and S58.921S 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.
| S58.921APartial traumatic amputation of right forearm, level unspecified, initial encounter | S58.921SPartial traumatic amputation of right forearm, level unspecified, 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 forearm, level unspecified, initial encounter is a billable ICD-10-CM diagnosis code (S58.921A). | Partial traumatic amputation of right forearm, level unspecified, sequela is a billable ICD-10-CM diagnosis code (S58.921S). |
| 7th character | The appropriate 7th character is to be added to each code from category S58 | The appropriate 7th character is to be added to each code from category S58 |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources