ICD-10-CM · FY 2026 APRIL UPDATE

S56.3

Injury of extensor or abductor muscles, fascia and tendons of thumb at forearm level

Diagnosis reference

Nonbillable category

This entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.

Effective periodOctober 1, 2026–September 30, 2027

SourceCMS ICD-10-CM order file

ClassificationDiagnosis · clinical modification

Related entries

Up to 30 descendants in this category

CODE	DESCRIPTION	TYPE
S56.30	Unspecified injury of extensor or abductor muscles, fascia and tendons of thumb at forearm level	Category
S56.301	Unspecified injury of extensor or abductor muscles, fascia and tendons of right thumb at forearm level	Category
S56.301A	Unspecified injury of extensor or abductor muscles, fascia and tendons of right thumb at forearm level, initial encounter	Billable
S56.301D	Unspecified injury of extensor or abductor muscles, fascia and tendons of right thumb at forearm level, subsequent encounter	Billable
S56.301S	Unspecified injury of extensor or abductor muscles, fascia and tendons of right thumb at forearm level, sequela	Billable
S56.302	Unspecified injury of extensor or abductor muscles, fascia and tendons of left thumb at forearm level	Category
S56.302A	Unspecified injury of extensor or abductor muscles, fascia and tendons of left thumb at forearm level, initial encounter	Billable
S56.302D	Unspecified injury of extensor or abductor muscles, fascia and tendons of left thumb at forearm level, subsequent encounter	Billable
S56.302S	Unspecified injury of extensor or abductor muscles, fascia and tendons of left thumb at forearm level, sequela	Billable
S56.309	Unspecified injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level	Category
S56.309A	Unspecified injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level, initial encounter	Billable
S56.309D	Unspecified injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level, subsequent encounter	Billable
S56.309S	Unspecified injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level, sequela	Billable
S56.31	Strain of extensor or abductor muscles, fascia and tendons of thumb at forearm level	Category
S56.311	Strain of extensor or abductor muscles, fascia and tendons of right thumb at forearm level	Category
S56.311A	Strain of extensor or abductor muscles, fascia and tendons of right thumb at forearm level, initial encounter	Billable
S56.311D	Strain of extensor or abductor muscles, fascia and tendons of right thumb at forearm level, subsequent encounter	Billable
S56.311S	Strain of extensor or abductor muscles, fascia and tendons of right thumb at forearm level, sequela	Billable
S56.312	Strain of extensor or abductor muscles, fascia and tendons of left thumb at forearm level	Category
S56.312A	Strain of extensor or abductor muscles, fascia and tendons of left thumb at forearm level, initial encounter	Billable
S56.312D	Strain of extensor or abductor muscles, fascia and tendons of left thumb at forearm level, subsequent encounter	Billable
S56.312S	Strain of extensor or abductor muscles, fascia and tendons of left thumb at forearm level, sequela	Billable
S56.319	Strain of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level	Category
S56.319A	Strain of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level, initial encounter	Billable
S56.319D	Strain of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level, subsequent encounter	Billable
S56.319S	Strain of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level, sequela	Billable
S56.32	Laceration of extensor or abductor muscles, fascia and tendons of thumb at forearm level	Category
S56.321	Laceration of extensor or abductor muscles, fascia and tendons of right thumb at forearm level	Category
S56.321A	Laceration of extensor or abductor muscles, fascia and tendons of right thumb at forearm level, initial encounter	Billable
S56.321D	Laceration of extensor or abductor muscles, fascia and tendons of right thumb at forearm level, subsequent encounter	Billable

Use the complete reference

This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.

Open official CMS files

ICD-10-CM codes describe diagnoses. They do not have an independent Medicare PFS reimbursement amount, and billability alone does not establish coverage.