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ICD-10-CM · FY 2026 APRIL UPDATE

M66.3

Spontaneous rupture of flexor tendons

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
M66.30Spontaneous rupture of flexor tendons, unspecified siteBillable
M66.31Spontaneous rupture of flexor tendons, shoulderCategory
M66.311Spontaneous rupture of flexor tendons, right shoulderBillable
M66.312Spontaneous rupture of flexor tendons, left shoulderBillable
M66.319Spontaneous rupture of flexor tendons, unspecified shoulderBillable
M66.32Spontaneous rupture of flexor tendons, upper armCategory
M66.321Spontaneous rupture of flexor tendons, right upper armBillable
M66.322Spontaneous rupture of flexor tendons, left upper armBillable
M66.329Spontaneous rupture of flexor tendons, unspecified upper armBillable
M66.33Spontaneous rupture of flexor tendons, forearmCategory
M66.331Spontaneous rupture of flexor tendons, right forearmBillable
M66.332Spontaneous rupture of flexor tendons, left forearmBillable
M66.339Spontaneous rupture of flexor tendons, unspecified forearmBillable
M66.34Spontaneous rupture of flexor tendons, handCategory
M66.341Spontaneous rupture of flexor tendons, right handBillable
M66.342Spontaneous rupture of flexor tendons, left handBillable
M66.349Spontaneous rupture of flexor tendons, unspecified handBillable
M66.35Spontaneous rupture of flexor tendons, thighCategory
M66.351Spontaneous rupture of flexor tendons, right thighBillable
M66.352Spontaneous rupture of flexor tendons, left thighBillable
M66.359Spontaneous rupture of flexor tendons, unspecified thighBillable
M66.36Spontaneous rupture of flexor tendons, lower legCategory
M66.361Spontaneous rupture of flexor tendons, right lower legBillable
M66.362Spontaneous rupture of flexor tendons, left lower legBillable
M66.369Spontaneous rupture of flexor tendons, unspecified lower legBillable
M66.37Spontaneous rupture of flexor tendons, ankle and footCategory
M66.371Spontaneous rupture of flexor tendons, right ankle and footBillable
M66.372Spontaneous rupture of flexor tendons, left ankle and footBillable
M66.379Spontaneous rupture of flexor tendons, unspecified ankle and footBillable
M66.38Spontaneous rupture of flexor tendons, other siteBillable

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.