S04.42XA (Injury of abducent nerve, left side, initial encounter) compared with S04.42XD (Injury of abducent nerve, left side, subsequent encounter), from the official CMS tabular data. S04.42XA and S04.42XD 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. S04.42XA and S04.42XD 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.
| S04.42XAInjury of abducent nerve, left side, initial encounter | S04.42XDInjury of abducent nerve, left side, subsequent encounter | |
|---|---|---|
| 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 abducent nerve, left side, initial encounter is a billable ICD-10-CM diagnosis code (S04.42A). | Injury of abducent nerve, left side, subsequent encounter is a billable ICD-10-CM diagnosis code (S04.42D). |
| 7th character | The appropriate 7th character is to be added to each code from category S04 | The appropriate 7th character is to be added to each code from category S04 |
| Includes | injuries of ear injuries of eye injuries of face [any part] injuries of gum | injuries of ear injuries of eye injuries of face [any part] injuries of gum |
| Code first | any associated intracranial injury (S06.-) | any associated intracranial injury (S06.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources