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ICD-10-CM · FY 2026 APRIL UPDATE

S66.20

Unspecified injury of extensor muscle, fascia and tendon of thumb 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

CODEDESCRIPTIONTYPE
S66.201Unspecified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand levelCategory
S66.201AUnspecified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level, initial encounterBillable
S66.201DUnspecified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level, subsequent encounterBillable
S66.201SUnspecified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level, sequelaBillable
S66.202Unspecified injury of extensor muscle, fascia and tendon of left thumb at wrist and hand levelCategory
S66.202AUnspecified injury of extensor muscle, fascia and tendon of left thumb at wrist and hand level, initial encounterBillable
S66.202DUnspecified injury of extensor muscle, fascia and tendon of left thumb at wrist and hand level, subsequent encounterBillable
S66.202SUnspecified injury of extensor muscle, fascia and tendon of left thumb at wrist and hand level, sequelaBillable
S66.209Unspecified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand levelCategory
S66.209AUnspecified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, initial encounterBillable
S66.209DUnspecified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounterBillable
S66.209SUnspecified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, sequelaBillable

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.