S56.309

Billable code

Unspecified injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level

The ICD-10 code for unspecified injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level is S56.309.

Documentation support

General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.

•Laterality-specific codes exist for this condition — confirm the affected side is documented.
•As a general rule, code to the highest level of specificity supported by the documentation in the medical record.