ICD-10-CM · FY 2026 APRIL UPDATE

S66.11

Strain of flexor 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
S66.110	Strain of flexor muscle, fascia and tendon of right index finger at wrist and hand level	Category
S66.110A	Strain of flexor muscle, fascia and tendon of right index finger at wrist and hand level, initial encounter	Billable
S66.110D	Strain of flexor muscle, fascia and tendon of right index finger at wrist and hand level, subsequent encounter	Billable
S66.110S	Strain of flexor muscle, fascia and tendon of right index finger at wrist and hand level, sequela	Billable
S66.111	Strain of flexor muscle, fascia and tendon of left index finger at wrist and hand level	Category
S66.111A	Strain of flexor muscle, fascia and tendon of left index finger at wrist and hand level, initial encounter	Billable
S66.111D	Strain of flexor muscle, fascia and tendon of left index finger at wrist and hand level, subsequent encounter	Billable
S66.111S	Strain of flexor muscle, fascia and tendon of left index finger at wrist and hand level, sequela	Billable
S66.112	Strain of flexor muscle, fascia and tendon of right middle finger at wrist and hand level	Category
S66.112A	Strain of flexor muscle, fascia and tendon of right middle finger at wrist and hand level, initial encounter	Billable
S66.112D	Strain of flexor muscle, fascia and tendon of right middle finger at wrist and hand level, subsequent encounter	Billable
S66.112S	Strain of flexor muscle, fascia and tendon of right middle finger at wrist and hand level, sequela	Billable
S66.113	Strain of flexor muscle, fascia and tendon of left middle finger at wrist and hand level	Category
S66.113A	Strain of flexor muscle, fascia and tendon of left middle finger at wrist and hand level, initial encounter	Billable
S66.113D	Strain of flexor muscle, fascia and tendon of left middle finger at wrist and hand level, subsequent encounter	Billable
S66.113S	Strain of flexor muscle, fascia and tendon of left middle finger at wrist and hand level, sequela	Billable
S66.114	Strain of flexor muscle, fascia and tendon of right ring finger at wrist and hand level	Category
S66.114A	Strain of flexor muscle, fascia and tendon of right ring finger at wrist and hand level, initial encounter	Billable
S66.114D	Strain of flexor muscle, fascia and tendon of right ring finger at wrist and hand level, subsequent encounter	Billable
S66.114S	Strain of flexor muscle, fascia and tendon of right ring finger at wrist and hand level, sequela	Billable
S66.115	Strain of flexor muscle, fascia and tendon of left ring finger at wrist and hand level	Category
S66.115A	Strain of flexor muscle, fascia and tendon of left ring finger at wrist and hand level, initial encounter	Billable
S66.115D	Strain of flexor muscle, fascia and tendon of left ring finger at wrist and hand level, subsequent encounter	Billable
S66.115S	Strain of flexor muscle, fascia and tendon of left ring finger at wrist and hand level, sequela	Billable
S66.116	Strain of flexor muscle, fascia and tendon of right little finger at wrist and hand level	Category
S66.116A	Strain of flexor muscle, fascia and tendon of right little finger at wrist and hand level, initial encounter	Billable
S66.116D	Strain of flexor muscle, fascia and tendon of right little finger at wrist and hand level, subsequent encounter	Billable
S66.116S	Strain of flexor muscle, fascia and tendon of right little finger at wrist and hand level, sequela	Billable
S66.117	Strain of flexor muscle, fascia and tendon of left little finger at wrist and hand level	Category
S66.117A	Strain of flexor 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.