ICD-10-CM · FY 2026 APRIL UPDATE

S66.39

Other injury of extensor muscle, fascia and tendon of other and unspecified finger 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
S66.390	Other injury of extensor muscle, fascia and tendon of right index finger at wrist and hand level	Category
S66.390A	Other injury of extensor muscle, fascia and tendon of right index finger at wrist and hand level, initial encounter	Billable
S66.390D	Other injury of extensor muscle, fascia and tendon of right index finger at wrist and hand level, subsequent encounter	Billable
S66.390S	Other injury of extensor muscle, fascia and tendon of right index finger at wrist and hand level, sequela	Billable
S66.391	Other injury of extensor muscle, fascia and tendon of left index finger at wrist and hand level	Category
S66.391A	Other injury of extensor muscle, fascia and tendon of left index finger at wrist and hand level, initial encounter	Billable
S66.391D	Other injury of extensor muscle, fascia and tendon of left index finger at wrist and hand level, subsequent encounter	Billable
S66.391S	Other injury of extensor muscle, fascia and tendon of left index finger at wrist and hand level, sequela	Billable
S66.392	Other injury of extensor muscle, fascia and tendon of right middle finger at wrist and hand level	Category
S66.392A	Other injury of extensor muscle, fascia and tendon of right middle finger at wrist and hand level, initial encounter	Billable
S66.392D	Other injury of extensor muscle, fascia and tendon of right middle finger at wrist and hand level, subsequent encounter	Billable
S66.392S	Other injury of extensor muscle, fascia and tendon of right middle finger at wrist and hand level, sequela	Billable
S66.393	Other injury of extensor muscle, fascia and tendon of left middle finger at wrist and hand level	Category
S66.393A	Other injury of extensor muscle, fascia and tendon of left middle finger at wrist and hand level, initial encounter	Billable
S66.393D	Other injury of extensor muscle, fascia and tendon of left middle finger at wrist and hand level, subsequent encounter	Billable
S66.393S	Other injury of extensor muscle, fascia and tendon of left middle finger at wrist and hand level, sequela	Billable
S66.394	Other injury of extensor muscle, fascia and tendon of right ring finger at wrist and hand level	Category
S66.394A	Other injury of extensor muscle, fascia and tendon of right ring finger at wrist and hand level, initial encounter	Billable
S66.394D	Other injury of extensor muscle, fascia and tendon of right ring finger at wrist and hand level, subsequent encounter	Billable
S66.394S	Other injury of extensor muscle, fascia and tendon of right ring finger at wrist and hand level, sequela	Billable
S66.395	Other injury of extensor muscle, fascia and tendon of left ring finger at wrist and hand level	Category
S66.395A	Other injury of extensor muscle, fascia and tendon of left ring finger at wrist and hand level, initial encounter	Billable
S66.395D	Other injury of extensor muscle, fascia and tendon of left ring finger at wrist and hand level, subsequent encounter	Billable
S66.395S	Other injury of extensor muscle, fascia and tendon of left ring finger at wrist and hand level, sequela	Billable
S66.396	Other injury of extensor muscle, fascia and tendon of right little finger at wrist and hand level	Category
S66.396A	Other injury of extensor muscle, fascia and tendon of right little finger at wrist and hand level, initial encounter	Billable
S66.396D	Other injury of extensor muscle, fascia and tendon of right little finger at wrist and hand level, subsequent encounter	Billable
S66.396S	Other injury of extensor muscle, fascia and tendon of right little finger at wrist and hand level, sequela	Billable
S66.397	Other injury of extensor muscle, fascia and tendon of left little finger at wrist and hand level	Category
S66.397A	Other injury of extensor muscle, fascia and tendon of left little finger at wrist and hand level, initial 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.