Skip to main content

S88.121A vs S88.129A

S88.121A (Partial traumatic amputation at level between knee and ankle, right lower leg, initial encounter) compared with S88.129A (Partial traumatic amputation at level between knee and ankle, unspecified lower leg, initial encounter), from the official CMS tabular data. S88.121A and S88.129A code the same condition on opposite sides.

Relationship

Review

Laterality relationship

S88.121A
Right
Partial traumatic amputation at level between knee and ankle, right lower leg, initial encounter
S88.129A
Unspecified
Partial traumatic amputation at level between knee and ankle, unspecified lower leg, 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. S88.121A and S88.129A 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

S88.121APartial traumatic amputation at level between knee and ankle, right lower leg, initial encounterS88.129APartial traumatic amputation at level between knee and ankle, unspecified lower leg, initial encounter
Billing statusBillableBillable
ClassificationS00-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)
DefinitionPartial traumatic amputation at level between knee and ankle, right lower leg, initial encounter is a billable ICD-10-CM diagnosis code (S88.121A).Partial traumatic amputation at level between knee and ankle, unspecified lower leg, initial encounter is a billable ICD-10-CM diagnosis code (S88.129A).
7th characterThe appropriate 7th character is to be added to each code from category S88The appropriate 7th character is to be added to each code from category S88

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