S34.121A (Incomplete lesion of L1 level of lumbar spinal cord, initial encounter) compared with S34.121S (Incomplete lesion of L1 level of lumbar spinal cord, sequela), from the official CMS tabular data. S34.121A and S34.121S 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. S34.121A and S34.121S 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.
| S34.121AIncomplete lesion of L1 level of lumbar spinal cord, initial encounter | S34.121SIncomplete lesion of L1 level of lumbar spinal cord, 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 | Incomplete lesion of L1 level of lumbar spinal cord, initial encounter is a billable ICD-10-CM diagnosis code (S34.121A). | Incomplete lesion of L1 level of lumbar spinal cord, sequela is a billable ICD-10-CM diagnosis code (S34.121S). |
| 7th character | The appropriate 7th character is to be added to each code from category S34 | The appropriate 7th character is to be added to each code from category S34 |
| Includes | injuries to the abdominal wall injuries to the anus injuries to the buttock injuries to the external genitalia | injuries to the abdominal wall injuries to the anus injuries to the buttock injuries to the external genitalia |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources