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S94.21XA vs S94.21XD

S94.21XA (Injury of deep peroneal nerve at ankle and foot level, right leg, initial encounter) compared with S94.21XD (Injury of deep peroneal nerve at ankle and foot level, right leg, subsequent encounter), from the official CMS tabular data. S94.21XA and S94.21XD code the same injury at a different phase of treatment. MedCoder-derived

Relationship

Review

Encounter relationship

S94.21XA
Initial encounter
Injury of deep peroneal nerve at ankle and foot level, right leg, initial encounter
↔
S94.21XD
Subsequent encounter
Injury of deep peroneal nerve at ankle and foot level, right leg, subsequent encounter

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. S94.21XA and S94.21XD 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

S94.21XAInjury of deep peroneal nerve at ankle and foot level, right leg, initial encounterS94.21XDInjury of deep peroneal nerve at ankle and foot level, right leg, subsequent encounter
Billing statusBillableBillable
ClassificationS00-T88 — Injury, poisoning and certain other consequences of external causesS00-T88 — Injury, poisoning and certain other consequences of external causes
DefinitionInjury of deep peroneal nerve at ankle and foot level, right leg, initial encounter is a billable ICD-10-CM diagnosis code (S94.21A).Injury of deep peroneal nerve at ankle and foot level, right leg, subsequent encounter is a billable ICD-10-CM diagnosis code (S94.21D).
7th characterThe appropriate 7th character is to be added to each code from category S94The appropriate 7th character is to be added to each code from category S94
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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