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S88.122A vs S88.122S

S88.122A (Partial traumatic amputation at level between knee and ankle, left lower leg, initial encounter) compared with S88.122S (Partial traumatic amputation at level between knee and ankle, left lower leg, sequela), from the official CMS tabular data. S88.122A and S88.122S code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

S88.122A
Initial encounter
Partial traumatic amputation at level between knee and ankle, left lower leg, initial encounter
↔
S88.122S
Sequela
Partial traumatic amputation at level between knee and ankle, left lower leg, sequela

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

Can these codes be reported together?

Same injury, other encounter phase. S88.122A and S88.122S 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.

Side by side

S88.122APartial traumatic amputation at level between knee and ankle, left lower leg, initial encounterS88.122SPartial traumatic amputation at level between knee and ankle, left lower leg, sequela
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, left lower leg, initial encounter is a billable ICD-10-CM diagnosis code (S88.122A).Partial traumatic amputation at level between knee and ankle, left lower leg, sequela is a billable ICD-10-CM diagnosis code (S88.122S).
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
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources