ICD-10-CM · FY 2026 APRIL UPDATE

S66.51

Strain 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
S66.510	Strain of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level	Category
S66.510A	Strain of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level, initial encounter	Billable
S66.510D	Strain of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level, subsequent encounter	Billable
S66.510S	Strain of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level, sequela	Billable
S66.511	Strain of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level	Category
S66.511A	Strain of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level, initial encounter	Billable
S66.511D	Strain of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level, subsequent encounter	Billable
S66.511S	Strain of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level, sequela	Billable
S66.512	Strain of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level	Category
S66.512A	Strain of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level, initial encounter	Billable
S66.512D	Strain of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level, subsequent encounter	Billable
S66.512S	Strain of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level, sequela	Billable
S66.513	Strain of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level	Category
S66.513A	Strain of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level, initial encounter	Billable
S66.513D	Strain of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level, subsequent encounter	Billable
S66.513S	Strain of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level, sequela	Billable
S66.514	Strain of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level	Category
S66.514A	Strain of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level, initial encounter	Billable
S66.514D	Strain of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level, subsequent encounter	Billable
S66.514S	Strain of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level, sequela	Billable
S66.515	Strain of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level	Category
S66.515A	Strain of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level, initial encounter	Billable
S66.515D	Strain of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level, subsequent encounter	Billable
S66.515S	Strain of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level, sequela	Billable
S66.516	Strain of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level	Category
S66.516A	Strain of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level, initial encounter	Billable
S66.516D	Strain of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level, subsequent encounter	Billable
S66.516S	Strain of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level, sequela	Billable
S66.517	Strain of intrinsic muscle, fascia and tendon of left little finger at wrist and hand level	Category
S66.517A	Strain 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.