S44.40XA (Injury of musculocutaneous nerve, unspecified arm, initial encounter) compared with S44.41XA (Injury of musculocutaneous nerve, right arm, initial encounter), from the official CMS tabular data. S44.40XA and S44.41XA code the same condition on opposite sides.
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. S44.40XA and S44.41XA name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| S44.40XAInjury of musculocutaneous nerve, unspecified arm, initial encounter | S44.41XAInjury of musculocutaneous nerve, right arm, initial encounter | |
|---|---|---|
| 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 | Injury of musculocutaneous nerve, unspecified arm, initial encounter is a billable ICD-10-CM diagnosis code (S44.40A). | Injury of musculocutaneous nerve, right arm, initial encounter is a billable ICD-10-CM diagnosis code (S44.41A). |
| 7th character | The appropriate 7th character is to be added to each code from category S44 | The appropriate 7th character is to be added to each code from category S44 |
| Includes | injuries of axilla injuries of scapular region | injuries of axilla injuries of scapular region |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources