ICD-10-CM · FY 2026 APRIL UPDATE

S66.2

Injury of extensor muscle, fascia and tendon of thumb at wrist and hand 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
S66.20	Unspecified injury of extensor muscle, fascia and tendon of thumb at wrist and hand level	Category
S66.201	Unspecified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level	Category
S66.201A	Unspecified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter	Billable
S66.201D	Unspecified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level, subsequent encounter	Billable
S66.201S	Unspecified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level, sequela	Billable
S66.202	Unspecified injury of extensor muscle, fascia and tendon of left thumb at wrist and hand level	Category
S66.202A	Unspecified injury of extensor muscle, fascia and tendon of left thumb at wrist and hand level, initial encounter	Billable
S66.202D	Unspecified injury of extensor muscle, fascia and tendon of left thumb at wrist and hand level, subsequent encounter	Billable
S66.202S	Unspecified injury of extensor muscle, fascia and tendon of left thumb at wrist and hand level, sequela	Billable
S66.209	Unspecified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level	Category
S66.209A	Unspecified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, initial encounter	Billable
S66.209D	Unspecified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter	Billable
S66.209S	Unspecified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, sequela	Billable
S66.21	Strain of extensor muscle, fascia and tendon of thumb at wrist and hand level	Category
S66.211	Strain of extensor muscle, fascia and tendon of right thumb at wrist and hand level	Category
S66.211A	Strain of extensor muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter	Billable
S66.211D	Strain of extensor muscle, fascia and tendon of right thumb at wrist and hand level, subsequent encounter	Billable
S66.211S	Strain of extensor muscle, fascia and tendon of right thumb at wrist and hand level, sequela	Billable
S66.212	Strain of extensor muscle, fascia and tendon of left thumb at wrist and hand level	Category
S66.212A	Strain of extensor muscle, fascia and tendon of left thumb at wrist and hand level, initial encounter	Billable
S66.212D	Strain of extensor muscle, fascia and tendon of left thumb at wrist and hand level, subsequent encounter	Billable
S66.212S	Strain of extensor muscle, fascia and tendon of left thumb at wrist and hand level, sequela	Billable
S66.219	Strain of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level	Category
S66.219A	Strain of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, initial encounter	Billable
S66.219D	Strain of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter	Billable
S66.219S	Strain of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, sequela	Billable
S66.22	Laceration of extensor muscle, fascia and tendon of thumb at wrist and hand level	Category
S66.221	Laceration of extensor muscle, fascia and tendon of right thumb at wrist and hand level	Category
S66.221A	Laceration of extensor muscle, fascia and tendon of right thumb at wrist and hand level, initial encounter	Billable
S66.221D	Laceration of extensor muscle, fascia and tendon of right thumb at wrist and hand 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.