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S64.91XA vs S64.91XD

S64.91XA (Injury of unspecified nerve at wrist and hand level of right arm, initial encounter) compared with S64.91XD (Injury of unspecified nerve at wrist and hand level of right arm, subsequent encounter), from the official CMS tabular data. S64.91XA and S64.91XD code the same injury at a different phase of treatment. MedCoder-derived

Relationship

Review

Encounter relationship

S64.91XA
Initial encounter
Injury of unspecified nerve at wrist and hand level of right arm, initial encounter
↔
S64.91XD
Subsequent encounter
Injury of unspecified nerve at wrist and hand level of right arm, 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. S64.91XA and S64.91XD 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

S64.91XAInjury of unspecified nerve at wrist and hand level of right arm, initial encounterS64.91XDInjury of unspecified nerve at wrist and hand level of right arm, 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 unspecified nerve at wrist and hand level of right arm, initial encounter is a billable ICD-10-CM diagnosis code (S64.91A).Injury of unspecified nerve at wrist and hand level of right arm, subsequent encounter is a billable ICD-10-CM diagnosis code (S64.91D).
7th characterThe appropriate 7th character is to be added to each code from category S64The appropriate 7th character is to be added to each code from category S64
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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