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S56.405 vs S56.406

S56.405 (Unspecified injury of extensor muscle, fascia and tendon of right ring finger at forearm level) compared with S56.406 (Unspecified injury of extensor muscle, fascia and tendon of left ring finger at forearm level), from the official CMS tabular data. S56.405 and S56.406 code the same condition on opposite sides.

Relationship

Review

Laterality relationship

S56.405
Right
Unspecified injury of extensor muscle, fascia and tendon of right ring finger at forearm level
↔
S56.406
Left
Unspecified injury of extensor muscle, fascia and tendon of left ring finger at forearm level

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. S56.405 and S56.406 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

S56.405Unspecified injury of extensor muscle, fascia and tendon of right ring finger at forearm levelS56.406Unspecified injury of extensor muscle, fascia and tendon of left ring finger at forearm level
Billing statusNon-billable header

Report instead: S56.405A, S56.405D, S56.405S

Non-billable header

Report instead: S56.406A, S56.406D, S56.406S

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)
DefinitionUnspecified injury of extensor muscle, fascia and tendon of right ring finger at forearm level is a non-billable ICD-10-CM category code (S56.405).Unspecified injury of extensor muscle, fascia and tendon of left ring finger at forearm level is a non-billable ICD-10-CM category code (S56.406).
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
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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