ICD-10-CM · FY 2026 APRIL UPDATE

S66.50

Unspecified 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
S66.500	Unspecified injury of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level	Category
S66.500A	Unspecified injury of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level, initial encounter	Billable
S66.500D	Unspecified injury of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level, subsequent encounter	Billable
S66.500S	Unspecified injury of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level, sequela	Billable
S66.501	Unspecified injury of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level	Category
S66.501A	Unspecified injury of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level, initial encounter	Billable
S66.501D	Unspecified injury of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level, subsequent encounter	Billable
S66.501S	Unspecified injury of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level, sequela	Billable
S66.502	Unspecified injury of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level	Category
S66.502A	Unspecified injury of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level, initial encounter	Billable
S66.502D	Unspecified injury of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level, subsequent encounter	Billable
S66.502S	Unspecified injury of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level, sequela	Billable
S66.503	Unspecified injury of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level	Category
S66.503A	Unspecified injury of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level, initial encounter	Billable
S66.503D	Unspecified injury of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level, subsequent encounter	Billable
S66.503S	Unspecified injury of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level, sequela	Billable
S66.504	Unspecified injury of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level	Category
S66.504A	Unspecified injury of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level, initial encounter	Billable
S66.504D	Unspecified injury of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level, subsequent encounter	Billable
S66.504S	Unspecified injury of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level, sequela	Billable
S66.505	Unspecified injury of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level	Category
S66.505A	Unspecified injury of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level, initial encounter	Billable
S66.505D	Unspecified injury of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level, subsequent encounter	Billable
S66.505S	Unspecified injury of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level, sequela	Billable
S66.506	Unspecified injury of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level	Category
S66.506A	Unspecified injury of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level, initial encounter	Billable
S66.506D	Unspecified injury of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level, subsequent encounter	Billable
S66.506S	Unspecified injury of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level, sequela	Billable
S66.507	Unspecified injury of intrinsic muscle, fascia and tendon of left little finger at wrist and hand level	Category
S66.507A	Unspecified 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.