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S56.403 vs S56.404

S56.403 (Unspecified injury of extensor muscle, fascia and tendon of right middle finger at forearm level) compared with S56.404 (Unspecified injury of extensor muscle, fascia and tendon of left middle finger at forearm level), from the official CMS tabular data. S56.403 and S56.404 code the same condition on opposite sides. MedCoder-derived

Relationship

Review

Laterality relationship

S56.403
Right
Unspecified injury of extensor muscle, fascia and tendon of right middle finger at forearm level
↔
S56.404
Left
Unspecified injury of extensor muscle, fascia and tendon of left middle 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. S56.403 and S56.404 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

S56.403Unspecified injury of extensor muscle, fascia and tendon of right middle finger at forearm levelS56.404Unspecified injury of extensor muscle, fascia and tendon of left middle finger at forearm level
Billing statusNon-billable header

Report instead: S56.403A, S56.403D, S56.403S

Non-billable header

Report instead: S56.404A, S56.404D, S56.404S

ClassificationS00-T88 — Injury, poisoning and certain other consequences of external causesS00-T88 — Injury, poisoning and certain other consequences of external causes
DefinitionUnspecified injury of extensor muscle, fascia and tendon of right middle finger at forearm level is a non-billable ICD-10-CM category code (S56.403).Unspecified injury of extensor muscle, fascia and tendon of left middle finger at forearm level is a non-billable ICD-10-CM category code (S56.404).
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