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S55.992A vs S55.999A

S55.992A (Other specified injury of unspecified blood vessel at forearm level, left arm, initial encounter) compared with S55.999A (Other specified injury of unspecified blood vessel at forearm level, unspecified arm, initial encounter), from the official CMS tabular data. S55.992A and S55.999A code the same condition on opposite sides.

Relationship

Review

Laterality relationship

S55.992A
Left
Other specified injury of unspecified blood vessel at forearm level, left arm, initial encounter
S55.999A
Unspecified
Other specified injury of unspecified blood vessel at forearm level, unspecified arm, initial encounter

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)

Can these codes be reported together?

Same condition, opposite side. S55.992A and S55.999A 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.

Side by side

S55.992AOther specified injury of unspecified blood vessel at forearm level, left arm, initial encounterS55.999AOther specified injury of unspecified blood vessel at forearm level, unspecified arm, initial encounter
Billing statusBillableBillable
ClassificationS00-T88 — Injury, poisoning and certain other consequences of external causesS00-T88 — Injury, poisoning and certain other consequences of external causes
DefinitionOther specified injury of unspecified blood vessel at forearm level, left arm, initial encounter is a billable ICD-10-CM diagnosis code (S55.992A).Other specified injury of unspecified blood vessel at forearm level, unspecified arm, initial encounter is a billable ICD-10-CM diagnosis code (S55.999A).
7th characterThe appropriate 7th character is to be added to each code from category S55The appropriate 7th character is to be added to each code from category S55

Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources