ICD-10-CM · FY 2026 APRIL UPDATE

S66.59

Other injury of intrinsic 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
S66.590	Other injury of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level	Category
S66.590A	Other injury of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level, initial encounter	Billable
S66.590D	Other injury of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level, subsequent encounter	Billable
S66.590S	Other injury of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level, sequela	Billable
S66.591	Other injury of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level	Category
S66.591A	Other injury of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level, initial encounter	Billable
S66.591D	Other injury of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level, subsequent encounter	Billable
S66.591S	Other injury of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level, sequela	Billable
S66.592	Other injury of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level	Category
S66.592A	Other injury of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level, initial encounter	Billable
S66.592D	Other injury of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level, subsequent encounter	Billable
S66.592S	Other injury of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level, sequela	Billable
S66.593	Other injury of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level	Category
S66.593A	Other injury of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level, initial encounter	Billable
S66.593D	Other injury of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level, subsequent encounter	Billable
S66.593S	Other injury of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level, sequela	Billable
S66.594	Other injury of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level	Category
S66.594A	Other injury of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level, initial encounter	Billable
S66.594D	Other injury of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level, subsequent encounter	Billable
S66.594S	Other injury of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level, sequela	Billable
S66.595	Other injury of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level	Category
S66.595A	Other injury of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level, initial encounter	Billable
S66.595D	Other injury of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level, subsequent encounter	Billable
S66.595S	Other injury of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level, sequela	Billable
S66.596	Other injury of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level	Category
S66.596A	Other injury of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level, initial encounter	Billable
S66.596D	Other injury of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level, subsequent encounter	Billable
S66.596S	Other injury of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level, sequela	Billable
S66.597	Other injury of intrinsic muscle, fascia and tendon of left little finger at wrist and hand level	Category
S66.597A	Other injury of intrinsic 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.