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S56.312 vs S56.319

S56.312 (Strain of extensor or abductor muscles, fascia and tendons of left thumb at forearm level) compared with S56.319 (Strain of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level), from the official CMS tabular data. S56.312 and S56.319 code the same condition on opposite sides.

Relationship

Review

Laterality relationship

S56.312
Left
Strain of extensor or abductor muscles, fascia and tendons of left thumb at forearm level
↔
S56.319
Unspecified
Strain of extensor or abductor muscles, fascia and tendons of unspecified thumb 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. S56.312 and S56.319 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

S56.312Strain of extensor or abductor muscles, fascia and tendons of left thumb at forearm levelS56.319Strain of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level
Billing statusNon-billable header

Report instead: S56.312A, S56.312D, S56.312S

Non-billable header

Report instead: S56.319A, S56.319D, S56.319S

ClassificationS00-T88 — Injury, poisoning and certain other consequences of external causesS00-T88 — Injury, poisoning and certain other consequences of external causes
DefinitionStrain of extensor or abductor muscles, fascia and tendons of left thumb at forearm level is a non-billable ICD-10-CM category code (S56.312).Strain of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level is a non-billable ICD-10-CM category code (S56.319).
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