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S56.392D vs S56.399D

S56.392D (Other injury of extensor or abductor muscles, fascia and tendons of left thumb at forearm level, subsequent encounter) compared with S56.399D (Other injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level, subsequent encounter), from the official CMS tabular data. S56.392D and S56.399D code the same condition on opposite sides.

Relationship

Review

Laterality relationship

S56.392D
Left
Other injury of extensor or abductor muscles, fascia and tendons of left thumb at forearm level, subsequent encounter
S56.399D
Unspecified
Other injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level, subsequent 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. S56.392D and S56.399D 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

S56.392DOther injury of extensor or abductor muscles, fascia and tendons of left thumb at forearm level, subsequent encounterS56.399DOther injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level, subsequent 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)
DefinitionOther injury of extensor or abductor muscles, fascia and tendons of left thumb at forearm level, subsequent encounter is a billable ICD-10-CM diagnosis code (S56.392D).Other injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level, subsequent encounter is a billable ICD-10-CM diagnosis code (S56.399D).
7th characterThe appropriate 7th character is to be added to each code from category S56The appropriate 7th character is to be added to each code from category S56

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