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S56.502 vs S56.509

S56.502 (Unspecified injury of other extensor muscle, fascia and tendon at forearm level, left arm) compared with S56.509 (Unspecified injury of other extensor muscle, fascia and tendon at forearm level, unspecified arm), from the official CMS tabular data. S56.502 and S56.509 code the same condition on opposite sides.

Relationship

Review

Laterality relationship

S56.502
Left
Unspecified injury of other extensor muscle, fascia and tendon at forearm level, left arm
↔
S56.509
Unspecified
Unspecified injury of other extensor muscle, fascia and tendon at forearm level, unspecified arm

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. S56.502 and S56.509 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

S56.502Unspecified injury of other extensor muscle, fascia and tendon at forearm level, left armS56.509Unspecified injury of other extensor muscle, fascia and tendon at forearm level, unspecified arm
Billing statusNon-billable header

Report instead: S56.502A, S56.502D, S56.502S

Non-billable header

Report instead: S56.509A, S56.509D, S56.509S

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 other extensor muscle, fascia and tendon at forearm level, left arm is a non-billable ICD-10-CM category code (S56.502).Unspecified injury of other extensor muscle, fascia and tendon at forearm level, unspecified arm is a non-billable ICD-10-CM category code (S56.509).
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